From e61bb114d41ddf6ae5bf05a0109fc13116550c7d Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 19 Sep 2019 17:40:34 +0200
Subject: spi: atmel: Remove AVR32 leftover

AV32 support has been from the kernel a few release ago, but there was
still some specific macro for this architecture in this driver. Lets
remove it.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20190919154034.7489-1-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 24 ------------------------
 1 file changed, 24 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index acf318e7330c..3ed5e663da6f 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -222,37 +222,13 @@
 	  | SPI_BF(name, value))
 
 /* Register access macros */
-#ifdef CONFIG_AVR32
-#define spi_readl(port, reg) \
-	__raw_readl((port)->regs + SPI_##reg)
-#define spi_writel(port, reg, value) \
-	__raw_writel((value), (port)->regs + SPI_##reg)
-
-#define spi_readw(port, reg) \
-	__raw_readw((port)->regs + SPI_##reg)
-#define spi_writew(port, reg, value) \
-	__raw_writew((value), (port)->regs + SPI_##reg)
-
-#define spi_readb(port, reg) \
-	__raw_readb((port)->regs + SPI_##reg)
-#define spi_writeb(port, reg, value) \
-	__raw_writeb((value), (port)->regs + SPI_##reg)
-#else
 #define spi_readl(port, reg) \
 	readl_relaxed((port)->regs + SPI_##reg)
 #define spi_writel(port, reg, value) \
 	writel_relaxed((value), (port)->regs + SPI_##reg)
-
-#define spi_readw(port, reg) \
-	readw_relaxed((port)->regs + SPI_##reg)
 #define spi_writew(port, reg, value) \
 	writew_relaxed((value), (port)->regs + SPI_##reg)
 
-#define spi_readb(port, reg) \
-	readb_relaxed((port)->regs + SPI_##reg)
-#define spi_writeb(port, reg, value) \
-	writeb_relaxed((value), (port)->regs + SPI_##reg)
-#endif
 /* use PIO for small transfers, avoiding DMA setup/teardown overhead and
  * cache operations; better heuristics consider wordsize and bitrate.
  */
-- 
cgit v1.2.3-59-g8ed1b


From 6c613f68aabf33385c01e949204ac5ed30887161 Mon Sep 17 00:00:00 2001
From: Alexandru Ardelean <alexandru.ardelean@analog.com>
Date: Thu, 26 Sep 2019 13:51:35 +0300
Subject: spi: core,atmel: convert `word_delay_usecs` -> `word_delay` for
 spi_device

This change does a conversion from the `word_delay_usecs` -> `word_delay`
for the `spi_device` struct.

This allows users to specify inter-word delays in other unit types
(nano-seconds or clock cycles), depending on how users want.

The Atmel SPI driver is the only current user of the `word_delay_usecs`
field (from the `spi_device` struct).
So, it needed a slight conversion to use the `word_delay` as an `spi_delay`
struct.

In SPI core, the only required mechanism is to update the `word_delay`
information per `spi_transfer`. This requires a bit more logic than before,
because it needs that both delays be converted to a common unit
(nano-seconds) for comparison.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-8-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 26 ++++++++++++++++++++++++--
 drivers/spi/spi.c       | 24 ++++++++++++++++++++++--
 include/linux/spi/spi.h |  7 ++-----
 3 files changed, 48 insertions(+), 9 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 3ed5e663da6f..1471b049f99a 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1149,12 +1149,31 @@ atmel_spi_pdc_interrupt(int irq, void *dev_id)
 	return ret;
 }
 
+static int atmel_word_delay_csr(struct spi_device *spi, struct atmel_spi *as)
+{
+	struct spi_delay *delay = &spi->word_delay;
+	u32 value = delay->value;
+
+	switch (delay->unit) {
+	case SPI_DELAY_UNIT_NSECS:
+		value /= 1000;
+		break;
+	case SPI_DELAY_UNIT_USECS:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return (as->spi_clk / 1000000 * value) >> 5;
+}
+
 static int atmel_spi_setup(struct spi_device *spi)
 {
 	struct atmel_spi	*as;
 	struct atmel_spi_device	*asd;
 	u32			csr;
 	unsigned int		bits = spi->bits_per_word;
+	int			word_delay_csr;
 
 	as = spi_master_get_devdata(spi->master);
 
@@ -1178,11 +1197,14 @@ static int atmel_spi_setup(struct spi_device *spi)
 	 */
 	csr |= SPI_BF(DLYBS, 0);
 
+	word_delay_csr = atmel_word_delay_csr(spi, as);
+	if (word_delay_csr < 0)
+		return word_delay_csr;
+
 	/* DLYBCT adds delays between words.  This is useful for slow devices
 	 * that need a bit of time to setup the next transfer.
 	 */
-	csr |= SPI_BF(DLYBCT,
-			(as->spi_clk / 1000000 * spi->word_delay_usecs) >> 5);
+	csr |= SPI_BF(DLYBCT, word_delay_csr);
 
 	asd = spi->controller_state;
 	if (!asd) {
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b69c14082c52..307e440dd92d 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -3281,6 +3281,26 @@ void spi_set_cs_timing(struct spi_device *spi, u8 setup, u8 hold,
 }
 EXPORT_SYMBOL_GPL(spi_set_cs_timing);
 
+static int _spi_xfer_word_delay_update(struct spi_transfer *xfer,
+				       struct spi_device *spi)
+{
+	int delay1, delay2;
+
+	delay1 = _spi_delay_to_ns(&xfer->word_delay, xfer);
+	if (delay1 < 0)
+		return delay1;
+
+	delay2 = _spi_delay_to_ns(&spi->word_delay, xfer);
+	if (delay2 < 0)
+		return delay2;
+
+	if (delay1 < delay2)
+		memcpy(&xfer->word_delay, &spi->word_delay,
+		       sizeof(xfer->word_delay));
+
+	return 0;
+}
+
 static int __spi_validate(struct spi_device *spi, struct spi_message *message)
 {
 	struct spi_controller *ctlr = spi->controller;
@@ -3416,8 +3436,8 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
 				return -EINVAL;
 		}
 
-		if (xfer->word_delay_usecs < spi->word_delay_usecs)
-			xfer->word_delay_usecs = spi->word_delay_usecs;
+		if (_spi_xfer_word_delay_update(xfer, spi))
+			return -EINVAL;
 	}
 
 	message->status = -EINPROGRESS;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 6cb67ad53ffa..ebeb272aeb0f 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -139,7 +139,7 @@ extern int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer);
  *	the spi_master.
  * @cs_gpiod: gpio descriptor of the chipselect line (optional, NULL when
  *	not using a GPIO line)
- * @word_delay_usecs: microsecond delay to be inserted between consecutive
+ * @word_delay: delay to be inserted between consecutive
  *	words of a transfer
  *
  * @statistics: statistics for the spi_device
@@ -189,7 +189,7 @@ struct spi_device {
 	const char		*driver_override;
 	int			cs_gpio;	/* LEGACY: chip select gpio */
 	struct gpio_desc	*cs_gpiod;	/* chip select gpio desc */
-	uint8_t			word_delay_usecs; /* inter-word delay */
+	struct spi_delay	word_delay; /* inter-word delay */
 
 	/* the statistics */
 	struct spi_statistics	statistics;
@@ -781,8 +781,6 @@ extern void spi_res_release(struct spi_controller *ctlr,
  * @delay_usecs: microseconds to delay after this transfer before
  *	(optionally) changing the chipselect status, then starting
  *	the next transfer or completing this @spi_message.
- * @word_delay_usecs: microseconds to inter word delay after each word size
- *	(set by bits_per_word) transmission.
  * @word_delay: inter word delay to be introduced after each word size
  *	(set by bits_per_word) transmission.
  * @effective_speed_hz: the effective SCK-speed that was used to
@@ -897,7 +895,6 @@ struct spi_transfer {
 #define	SPI_NBITS_DUAL		0x02 /* 2bits transfer */
 #define	SPI_NBITS_QUAD		0x04 /* 4bits transfer */
 	u8		bits_per_word;
-	u8		word_delay_usecs;
 	u16		delay_usecs;
 	struct spi_delay	cs_change_delay;
 	struct spi_delay	word_delay;
-- 
cgit v1.2.3-59-g8ed1b


From e74dc5c763448004ec8add422e9db53ee246acce Mon Sep 17 00:00:00 2001
From: Alexandru Ardelean <alexandru.ardelean@analog.com>
Date: Thu, 26 Sep 2019 13:51:37 +0300
Subject: spi: use new `spi_transfer_delay_exec` helper where straightforward

For many places in the spi drivers, using the new `spi_transfer_delay`
helper is straightforward.
It's just replacing:
```
  if (t->delay_usecs)
     udelay(t->delay_usecs);
```
with `spi_transfer_delay(t)` which handles both `delay_usecs` and the new
`delay` field.

This change replaces in all places (in the spi drivers)  where this change
is simple.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-10-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c         |  3 +--
 drivers/spi/spi-bcm63xx-hsspi.c |  3 +--
 drivers/spi/spi-cavium.c        |  3 +--
 drivers/spi/spi-fsl-dspi.c      |  3 +--
 drivers/spi/spi-fsl-espi.c      |  3 +--
 drivers/spi/spi-fsl-spi.c       |  3 +--
 drivers/spi/spi-mpc512x-psc.c   |  3 +--
 drivers/spi/spi-mpc52xx-psc.c   |  3 +--
 drivers/spi/spi-omap-100k.c     |  3 +--
 drivers/spi/spi-pl022.c         | 25 +++++++++++--------------
 drivers/spi/spi-sc18is602.c     |  3 +--
 drivers/spi/spi-sh-hspi.c       |  3 +--
 drivers/spi/spi-topcliff-pch.c  |  7 +------
 drivers/spi/spi-txx9.c          |  3 +--
 drivers/spi/spi-xcomm.c         |  3 +--
 15 files changed, 25 insertions(+), 46 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 1471b049f99a..e34ab587b980 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1366,8 +1366,7 @@ static int atmel_spi_one_transfer(struct spi_master *master,
 		&& as->use_pdc)
 		atmel_spi_dma_unmap_xfer(master, xfer);
 
-	if (xfer->delay_usecs)
-		udelay(xfer->delay_usecs);
+	spi_transfer_delay_exec(xfer);
 
 	if (xfer->cs_change) {
 		if (list_is_last(&xfer->transfer_list,
diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c
index c6836a931dbf..7327309ea3d5 100644
--- a/drivers/spi/spi-bcm63xx-hsspi.c
+++ b/drivers/spi/spi-bcm63xx-hsspi.c
@@ -291,8 +291,7 @@ static int bcm63xx_hsspi_transfer_one(struct spi_master *master,
 
 		msg->actual_length += t->len;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		if (t->cs_change)
 			bcm63xx_hsspi_set_cs(bs, spi->chip_select, false);
diff --git a/drivers/spi/spi-cavium.c b/drivers/spi/spi-cavium.c
index 5aaf21582cb5..6854c3ce423b 100644
--- a/drivers/spi/spi-cavium.c
+++ b/drivers/spi/spi-cavium.c
@@ -119,8 +119,7 @@ static int octeon_spi_do_transfer(struct octeon_spi *p,
 			*rx_buf++ = (u8)v;
 		}
 
-	if (xfer->delay_usecs)
-		udelay(xfer->delay_usecs);
+	spi_transfer_delay_exec(xfer);
 
 	return xfer->len;
 }
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index c0e96cc7fc51..442cff71a0d2 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -827,8 +827,7 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr,
 			dev_err(&dspi->pdev->dev,
 				"Waiting for transfer to complete failed!\n");
 
-		if (transfer->delay_usecs)
-			udelay(transfer->delay_usecs);
+		spi_transfer_delay_exec(transfer);
 	}
 
 out:
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f72daf66f3f3..e60581283a24 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -427,8 +427,7 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	ret = fsl_espi_bufs(spi, trans);
 
-	if (trans->delay_usecs)
-		udelay(trans->delay_usecs);
+	spi_transfer_delay_exec(trans);
 
 	return ret;
 }
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 4b80ace1d137..114801a32371 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -416,8 +416,7 @@ static int fsl_spi_do_one_msg(struct spi_master *master,
 		}
 		m->actual_length += t->len;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		if (cs_change) {
 			ndelay(nsecs);
diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index a337b842ae8c..ea1b07953d38 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -311,8 +311,7 @@ static int mpc512x_psc_spi_msg_xfer(struct spi_master *master,
 			break;
 		m->actual_length += t->len;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		if (cs_change)
 			mpc512x_psc_spi_deactivate_cs(spi);
diff --git a/drivers/spi/spi-mpc52xx-psc.c b/drivers/spi/spi-mpc52xx-psc.c
index c7e478b9b586..17935e71b02f 100644
--- a/drivers/spi/spi-mpc52xx-psc.c
+++ b/drivers/spi/spi-mpc52xx-psc.c
@@ -234,8 +234,7 @@ static void mpc52xx_psc_spi_work(struct work_struct *work)
 				break;
 			m->actual_length += t->len;
 
-			if (t->delay_usecs)
-				udelay(t->delay_usecs);
+			spi_transfer_delay_exec(t);
 
 			if (cs_change)
 				mpc52xx_psc_spi_deactivate_cs(spi);
diff --git a/drivers/spi/spi-omap-100k.c b/drivers/spi/spi-omap-100k.c
index 43a4785fc89b..5c704ba6d8ea 100644
--- a/drivers/spi/spi-omap-100k.c
+++ b/drivers/spi/spi-omap-100k.c
@@ -321,8 +321,7 @@ static int omap1_spi100k_transfer_one_message(struct spi_master *master,
 			}
 		}
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		/* ignore the "leave it on after last xfer" hint */
 
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 7fedea67159c..3024c30e7f2e 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -485,12 +485,11 @@ static void giveback(struct pl022 *pl022)
 					struct spi_transfer, transfer_list);
 
 	/* Delay if requested before any change in chip select */
-	if (last_transfer->delay_usecs)
-		/*
-		 * FIXME: This runs in interrupt context.
-		 * Is this really smart?
-		 */
-		udelay(last_transfer->delay_usecs);
+	/*
+	 * FIXME: This runs in interrupt context.
+	 * Is this really smart?
+	 */
+	spi_transfer_delay_exec(last_transfer);
 
 	if (!last_transfer->cs_change) {
 		struct spi_message *next_msg;
@@ -1401,12 +1400,11 @@ static void pump_transfers(unsigned long data)
 		previous = list_entry(transfer->transfer_list.prev,
 					struct spi_transfer,
 					transfer_list);
-		if (previous->delay_usecs)
-			/*
-			 * FIXME: This runs in interrupt context.
-			 * Is this really smart?
-			 */
-			udelay(previous->delay_usecs);
+		/*
+		 * FIXME: This runs in interrupt context.
+		 * Is this really smart?
+		 */
+		spi_transfer_delay_exec(previous);
 
 		/* Reselect chip select only if cs_change was requested */
 		if (previous->cs_change)
@@ -1520,8 +1518,7 @@ static void do_polling_transfer(struct pl022 *pl022)
 			previous =
 			    list_entry(transfer->transfer_list.prev,
 				       struct spi_transfer, transfer_list);
-			if (previous->delay_usecs)
-				udelay(previous->delay_usecs);
+			spi_transfer_delay_exec(previous);
 			if (previous->cs_change)
 				pl022_cs_control(pl022, SSP_CHIP_SELECT);
 		} else {
diff --git a/drivers/spi/spi-sc18is602.c b/drivers/spi/spi-sc18is602.c
index 11acddc83304..5497eeb3bf3e 100644
--- a/drivers/spi/spi-sc18is602.c
+++ b/drivers/spi/spi-sc18is602.c
@@ -211,8 +211,7 @@ static int sc18is602_transfer_one(struct spi_master *master,
 		}
 		status = 0;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 	}
 	m->status = status;
 	spi_finalize_current_message(master);
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c
index 7f73f91d412a..a62034e2a7cb 100644
--- a/drivers/spi/spi-sh-hspi.c
+++ b/drivers/spi/spi-sh-hspi.c
@@ -190,8 +190,7 @@ static int hspi_transfer_one_message(struct spi_controller *ctlr,
 
 		msg->actual_length += t->len;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		if (cs_change) {
 			ndelay(nsecs);
diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index f88cbb94ce12..223353fa2d8a 100644
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -1229,12 +1229,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
 			"%s:data->current_msg->actual_length=%d\n",
 			__func__, data->current_msg->actual_length);
 
-		/* check for delay */
-		if (data->cur_trans->delay_usecs) {
-			dev_dbg(&data->master->dev, "%s:delay in usec=%d\n",
-				__func__, data->cur_trans->delay_usecs);
-			udelay(data->cur_trans->delay_usecs);
-		}
+		spi_transfer_delay_exec(data->cur_trans);
 
 		spin_lock(&data->lock);
 
diff --git a/drivers/spi/spi-txx9.c b/drivers/spi/spi-txx9.c
index 51759d3fd45f..83daaa597acc 100644
--- a/drivers/spi/spi-txx9.c
+++ b/drivers/spi/spi-txx9.c
@@ -248,8 +248,7 @@ static void txx9spi_work_one(struct txx9spi *c, struct spi_message *m)
 			len -= count * wsize;
 		}
 		m->actual_length += t->len;
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		if (!cs_change)
 			continue;
diff --git a/drivers/spi/spi-xcomm.c b/drivers/spi/spi-xcomm.c
index a3496c46cc1b..1d9b3f03d986 100644
--- a/drivers/spi/spi-xcomm.c
+++ b/drivers/spi/spi-xcomm.c
@@ -188,8 +188,7 @@ static int spi_xcomm_transfer_one(struct spi_master *master,
 		}
 		status = 0;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
+		spi_transfer_delay_exec(t);
 
 		is_first = false;
 	}
-- 
cgit v1.2.3-59-g8ed1b


From 4d8672d17450b457c0dbbcfe9868438036b4647c Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:40 +0200
Subject: spi: atmel: Remove and fix erroneous comments

Since CSAAT functionality support has been added. Some comments become
wrong. Fix them to match the current driver behavior.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-2-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index e34ab587b980..7a17c3e2a8ee 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -312,11 +312,9 @@ static bool atmel_spi_is_v2(struct atmel_spi *as)
  * transmitted")  Not so!  Workaround uses nCSx pins as GPIOs; or newer
  * controllers have CSAAT and friends.
  *
- * Since the CSAAT functionality is a bit weird on newer controllers as
- * well, we use GPIO to control nCSx pins on all controllers, updating
- * MR.PCS to avoid confusing the controller.  Using GPIOs also lets us
- * support active-high chipselects despite the controller's belief that
- * only active-low devices/systems exists.
+ * Even controller newer than ar91rm9200, using GPIOs can make sens as
+ * it lets us support active-high chipselects despite the controller's
+ * belief that only active-low devices/systems exists.
  *
  * However, at91rm9200 has a second erratum whereby nCS0 doesn't work
  * right when driven with GPIO.  ("Mode Fault does not allow more than one
@@ -1193,8 +1191,6 @@ static int atmel_spi_setup(struct spi_device *spi)
 	if (!as->use_cs_gpios)
 		csr |= SPI_BIT(CSAAT);
 
-	/* DLYBS is mostly irrelevant since we manage chipselect using GPIOs.
-	 */
 	csr |= SPI_BF(DLYBS, 0);
 
 	word_delay_csr = atmel_word_delay_csr(spi, as);
-- 
cgit v1.2.3-59-g8ed1b


From 7cbb16b2122c09f2ae393a1542fed628505b9da6 Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:41 +0200
Subject: spi: atmel: Fix CS high support

Until a few years ago, this driver was only used with CS GPIO. The
only exception is CS0 on AT91RM9200 which has to use internal CS. A
limitation of the internal CS is that they don't support CS High.

So by using the CS GPIO the CS high configuration was available except
for the particular case CS0 on RM9200.

When the support for the internal chip-select was added, the check of
the CS high support was not updated. Due to this the driver accepts
this configuration for all the SPI controller v2 (used by all SoCs
excepting the AT91RM9200) whereas the hardware doesn't support it for
infernal CS.

This patch fixes the test to match the hardware capabilities.

Fixes: 4820303480a1 ("spi: atmel: add support for the internal chip-select of the spi controller")
Cc: <stable@vger.kernel.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-3-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 7a17c3e2a8ee..6e08ae539bc0 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1176,10 +1176,8 @@ static int atmel_spi_setup(struct spi_device *spi)
 	as = spi_master_get_devdata(spi->master);
 
 	/* see notes above re chipselect */
-	if (!atmel_spi_is_v2(as)
-			&& spi->chip_select == 0
-			&& (spi->mode & SPI_CS_HIGH)) {
-		dev_dbg(&spi->dev, "setup: can't be active-high\n");
+	if (!as->use_cs_gpios && (spi->mode & SPI_CS_HIGH)) {
+		dev_warn(&spi->dev, "setup: non GPIO CS can't be active-high\n");
 		return -EINVAL;
 	}
 
-- 
cgit v1.2.3-59-g8ed1b


From 585d18f7ebd1dba7400dcc7189a5f7223b821374 Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:42 +0200
Subject: spi: atmel: Configure GPIO per CS instead of by controller

Instead of setting up the GPIO configuration for the whole controller,
do it at CS level. It will allow to mix internal CS and GPIO CS, which
is not possible with the current implementation.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-4-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 32 ++++++++------------------------
 1 file changed, 8 insertions(+), 24 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 6e08ae539bc0..b511df6a4846 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -275,7 +275,6 @@ struct atmel_spi {
 
 	bool			use_dma;
 	bool			use_pdc;
-	bool			use_cs_gpios;
 
 	bool			keep_cs;
 	bool			cs_active;
@@ -348,7 +347,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 		}
 
 		mr = spi_readl(as, MR);
-		if (as->use_cs_gpios)
+		if (asd->npcs_pin)
 			gpiod_set_value(asd->npcs_pin, 1);
 	} else {
 		u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0;
@@ -365,7 +364,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 
 		mr = spi_readl(as, MR);
 		mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
-		if (as->use_cs_gpios && spi->chip_select != 0)
+		if (asd->npcs_pin && spi->chip_select != 0)
 			gpiod_set_value(asd->npcs_pin, 1);
 		spi_writel(as, MR, mr);
 	}
@@ -389,7 +388,7 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
 
 	dev_dbg(&spi->dev, "DEactivate NPCS, mr %08x\n", mr);
 
-	if (!as->use_cs_gpios)
+	if (!asd->npcs_pin)
 		spi_writel(as, CR, SPI_BIT(LASTXFER));
 	else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
 		gpiod_set_value(asd->npcs_pin, 0);
@@ -1176,7 +1175,7 @@ static int atmel_spi_setup(struct spi_device *spi)
 	as = spi_master_get_devdata(spi->master);
 
 	/* see notes above re chipselect */
-	if (!as->use_cs_gpios && (spi->mode & SPI_CS_HIGH)) {
+	if (!spi->cs_gpiod && (spi->mode & SPI_CS_HIGH)) {
 		dev_warn(&spi->dev, "setup: non GPIO CS can't be active-high\n");
 		return -EINVAL;
 	}
@@ -1186,9 +1185,9 @@ static int atmel_spi_setup(struct spi_device *spi)
 		csr |= SPI_BIT(CPOL);
 	if (!(spi->mode & SPI_CPHA))
 		csr |= SPI_BIT(NCPHA);
-	if (!as->use_cs_gpios)
-		csr |= SPI_BIT(CSAAT);
 
+	if (!spi->cs_gpiod)
+		csr |= SPI_BIT(CSAAT);
 	csr |= SPI_BF(DLYBS, 0);
 
 	word_delay_csr = atmel_word_delay_csr(spi, as);
@@ -1206,20 +1205,8 @@ static int atmel_spi_setup(struct spi_device *spi)
 		if (!asd)
 			return -ENOMEM;
 
-		/*
-		 * If use_cs_gpios is true this means that we have "cs-gpios"
-		 * defined in the device tree node so we should have
-		 * gotten the GPIO lines from the device tree inside the
-		 * SPI core. Warn if this is not the case but continue since
-		 * CS GPIOs are after all optional.
-		 */
-		if (as->use_cs_gpios) {
-			if (!spi->cs_gpiod) {
-				dev_err(&spi->dev,
-					"host claims to use CS GPIOs but no CS found in DT by the SPI core\n");
-			}
+		if (spi->cs_gpiod)
 			asd->npcs_pin = spi->cs_gpiod;
-		}
 
 		spi->controller_state = asd;
 	}
@@ -1551,13 +1538,10 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	 * discovered by the SPI core when registering the SPI master
 	 * and assigned to each SPI device.
 	 */
-	as->use_cs_gpios = true;
 	if (atmel_spi_is_v2(as) &&
 	    pdev->dev.of_node &&
-	    !of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) {
-		as->use_cs_gpios = false;
+	    !of_get_property(pdev->dev.of_node, "cs-gpios", NULL))
 		master->num_chipselect = 4;
-	}
 
 	as->use_dma = false;
 	as->use_pdc = false;
-- 
cgit v1.2.3-59-g8ed1b


From 60086e23e64f7b3b60d957471cfd10948e25648e Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:43 +0200
Subject: spi: atmel: Remove useless private field

Since the conversion to GPIO descriptor, the GPIO used as chip select,
can be directly access from the spi_device struct. So there is no need
to keep the field npcs_pin.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-5-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index b511df6a4846..19600de40422 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -284,7 +284,6 @@ struct atmel_spi {
 
 /* Controller-specific per-slave state */
 struct atmel_spi_device {
-	struct gpio_desc	*npcs_pin;
 	u32			csr;
 };
 
@@ -347,8 +346,8 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 		}
 
 		mr = spi_readl(as, MR);
-		if (asd->npcs_pin)
-			gpiod_set_value(asd->npcs_pin, 1);
+		if (spi->cs_gpiod)
+			gpiod_set_value(spi->cs_gpiod, 1);
 	} else {
 		u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0;
 		int i;
@@ -364,8 +363,8 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 
 		mr = spi_readl(as, MR);
 		mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
-		if (asd->npcs_pin && spi->chip_select != 0)
-			gpiod_set_value(asd->npcs_pin, 1);
+		if (spi->cs_gpiod && spi->chip_select != 0)
+			gpiod_set_value(spi->cs_gpiod, 1);
 		spi_writel(as, MR, mr);
 	}
 
@@ -374,7 +373,6 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 
 static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
 {
-	struct atmel_spi_device *asd = spi->controller_state;
 	u32 mr;
 
 	/* only deactivate *this* device; sometimes transfers to
@@ -388,10 +386,10 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
 
 	dev_dbg(&spi->dev, "DEactivate NPCS, mr %08x\n", mr);
 
-	if (!asd->npcs_pin)
+	if (!spi->cs_gpiod)
 		spi_writel(as, CR, SPI_BIT(LASTXFER));
 	else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
-		gpiod_set_value(asd->npcs_pin, 0);
+		gpiod_set_value(spi->cs_gpiod, 0);
 }
 
 static void atmel_spi_lock(struct atmel_spi *as) __acquires(&as->lock)
@@ -1205,9 +1203,6 @@ static int atmel_spi_setup(struct spi_device *spi)
 		if (!asd)
 			return -ENOMEM;
 
-		if (spi->cs_gpiod)
-			asd->npcs_pin = spi->cs_gpiod;
-
 		spi->controller_state = asd;
 	}
 
-- 
cgit v1.2.3-59-g8ed1b


From 1cb84b02bf130f34ee81f99bc7dee5bca2943ed7 Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:44 +0200
Subject: spi: atmel: Remove platform data support

This driver is now only used through the device tree. Simplify code
by explicitly depend on device tree.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-6-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/Kconfig     |  1 +
 drivers/spi/spi-atmel.c | 16 ++--------------
 2 files changed, 3 insertions(+), 14 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 6f7fdcbb9151..6c0c1f55bd71 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -80,6 +80,7 @@ config SPI_ARMADA_3700
 config SPI_ATMEL
 	tristate "Atmel SPI Controller"
 	depends on ARCH_AT91 || COMPILE_TEST
+	depends on OF
 	help
 	  This selects a driver for the Atmel SPI Controller, present on
 	  many AT91 ARM chips.
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 19600de40422..1ff5b20eabf7 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1500,7 +1500,7 @@ static int atmel_spi_probe(struct platform_device *pdev)
 	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 16);
 	master->dev.of_node = pdev->dev.of_node;
 	master->bus_num = pdev->id;
-	master->num_chipselect = master->dev.of_node ? 0 : 4;
+	master->num_chipselect = 4;
 	master->setup = atmel_spi_setup;
 	master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX);
 	master->transfer_one_message = atmel_spi_transfer_one_message;
@@ -1528,16 +1528,6 @@ static int atmel_spi_probe(struct platform_device *pdev)
 
 	atmel_get_caps(as);
 
-	/*
-	 * If there are chip selects in the device tree, those will be
-	 * discovered by the SPI core when registering the SPI master
-	 * and assigned to each SPI device.
-	 */
-	if (atmel_spi_is_v2(as) &&
-	    pdev->dev.of_node &&
-	    !of_get_property(pdev->dev.of_node, "cs-gpios", NULL))
-		master->num_chipselect = 4;
-
 	as->use_dma = false;
 	as->use_pdc = false;
 	if (as->caps.has_dma_support) {
@@ -1745,20 +1735,18 @@ static const struct dev_pm_ops atmel_spi_pm_ops = {
 #define ATMEL_SPI_PM_OPS	NULL
 #endif
 
-#if defined(CONFIG_OF)
 static const struct of_device_id atmel_spi_dt_ids[] = {
 	{ .compatible = "atmel,at91rm9200-spi" },
 	{ /* sentinel */ }
 };
 
 MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids);
-#endif
 
 static struct platform_driver atmel_spi_driver = {
 	.driver		= {
 		.name	= "atmel_spi",
 		.pm	= ATMEL_SPI_PM_OPS,
-		.of_match_table	= of_match_ptr(atmel_spi_dt_ids),
+		.of_match_table	= atmel_spi_dt_ids,
 	},
 	.probe		= atmel_spi_probe,
 	.remove		= atmel_spi_remove,
-- 
cgit v1.2.3-59-g8ed1b


From 57e3137710443a3227a54c425b9c606425678c8f Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:45 +0200
Subject: spi: atmel: Improve and fix GPIO CS usage

In the previous implementation of this driver, the index of the GPIO
used as CS was linked to the offset of the CS register used to
configure the transfer.

With this new implementation the first CS register not used by
internal CS is associated to all the GPIO CS. It allows to not be
anymore limited to have only 4 CS managed, now it is possible to have
in the same time until 3 internal CS and no more limit for the CS
GPIO.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-7-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 74 +++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 66 insertions(+), 8 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 1ff5b20eabf7..ac5e2ddf9e1b 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -280,6 +280,8 @@ struct atmel_spi {
 	bool			cs_active;
 
 	u32			fifo_size;
+	u8			native_cs_free;
+	u8			native_cs_for_gpio;
 };
 
 /* Controller-specific per-slave state */
@@ -324,23 +326,29 @@ static bool atmel_spi_is_v2(struct atmel_spi *as)
 static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 {
 	struct atmel_spi_device *asd = spi->controller_state;
+	int chip_select;
 	u32 mr;
 
+	if (spi->cs_gpiod)
+		chip_select = as->native_cs_for_gpio;
+	else
+		chip_select = spi->chip_select;
+
 	if (atmel_spi_is_v2(as)) {
-		spi_writel(as, CSR0 + 4 * spi->chip_select, asd->csr);
+		spi_writel(as, CSR0 + 4 * chip_select, asd->csr);
 		/* For the low SPI version, there is a issue that PDC transfer
 		 * on CS1,2,3 needs SPI_CSR0.BITS config as SPI_CSR1,2,3.BITS
 		 */
 		spi_writel(as, CSR0, asd->csr);
 		if (as->caps.has_wdrbt) {
 			spi_writel(as, MR,
-					SPI_BF(PCS, ~(0x01 << spi->chip_select))
+					SPI_BF(PCS, ~(0x01 << chip_select))
 					| SPI_BIT(WDRBT)
 					| SPI_BIT(MODFDIS)
 					| SPI_BIT(MSTR));
 		} else {
 			spi_writel(as, MR,
-					SPI_BF(PCS, ~(0x01 << spi->chip_select))
+					SPI_BF(PCS, ~(0x01 << chip_select))
 					| SPI_BIT(MODFDIS)
 					| SPI_BIT(MSTR));
 		}
@@ -362,7 +370,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 		}
 
 		mr = spi_readl(as, MR);
-		mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
+		mr = SPI_BFINS(PCS, ~(1 << chip_select), mr);
 		if (spi->cs_gpiod && spi->chip_select != 0)
 			gpiod_set_value(spi->cs_gpiod, 1);
 		spi_writel(as, MR, mr);
@@ -373,13 +381,19 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 
 static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
 {
+	int chip_select;
 	u32 mr;
 
+	if (spi->cs_gpiod)
+		chip_select = as->native_cs_for_gpio;
+	else
+		chip_select = spi->chip_select;
+
 	/* only deactivate *this* device; sometimes transfers to
 	 * another device may be active when this routine is called.
 	 */
 	mr = spi_readl(as, MR);
-	if (~SPI_BFEXT(PCS, mr) & (1 << spi->chip_select)) {
+	if (~SPI_BFEXT(PCS, mr) & (1 << chip_select)) {
 		mr = SPI_BFINS(PCS, 0xf, mr);
 		spi_writel(as, MR, mr);
 	}
@@ -815,6 +829,12 @@ static int atmel_spi_set_xfer_speed(struct atmel_spi *as,
 {
 	u32			scbr, csr;
 	unsigned long		bus_hz;
+	int chip_select;
+
+	if (spi->cs_gpiod)
+		chip_select = as->native_cs_for_gpio;
+	else
+		chip_select = spi->chip_select;
 
 	/* v1 chips start out at half the peripheral bus speed. */
 	bus_hz = as->spi_clk;
@@ -843,9 +863,9 @@ static int atmel_spi_set_xfer_speed(struct atmel_spi *as,
 			xfer->speed_hz, scbr, bus_hz);
 		return -EINVAL;
 	}
-	csr = spi_readl(as, CSR0 + 4 * spi->chip_select);
+	csr = spi_readl(as, CSR0 + 4 * chip_select);
 	csr = SPI_BFINS(SCBR, scbr, csr);
-	spi_writel(as, CSR0 + 4 * spi->chip_select, csr);
+	spi_writel(as, CSR0 + 4 * chip_select, csr);
 
 	return 0;
 }
@@ -1162,12 +1182,32 @@ static int atmel_word_delay_csr(struct spi_device *spi, struct atmel_spi *as)
 	return (as->spi_clk / 1000000 * value) >> 5;
 }
 
+static void initialize_native_cs_for_gpio(struct atmel_spi *as)
+{
+	int i;
+	struct spi_master *master = platform_get_drvdata(as->pdev);
+
+	if (!as->native_cs_free)
+		return; /* already initialized */
+
+	if (!master->cs_gpiods)
+		return; /* No CS GPIO */
+
+	for (i = 0; i < 4; i++)
+		if (master->cs_gpiods[i])
+			as->native_cs_free |= BIT(i);
+
+	if (as->native_cs_free)
+		as->native_cs_for_gpio = ffs(as->native_cs_free);
+}
+
 static int atmel_spi_setup(struct spi_device *spi)
 {
 	struct atmel_spi	*as;
 	struct atmel_spi_device	*asd;
 	u32			csr;
 	unsigned int		bits = spi->bits_per_word;
+	int chip_select;
 	int			word_delay_csr;
 
 	as = spi_master_get_devdata(spi->master);
@@ -1178,6 +1218,24 @@ static int atmel_spi_setup(struct spi_device *spi)
 		return -EINVAL;
 	}
 
+	/* Setup() is called during spi_register_controller(aka
+	 * spi_register_master) but after all membmers of the cs_gpiod
+	 * array have been filled, so we can looked for which native
+	 * CS will be free for using with GPIO
+	 */
+	initialize_native_cs_for_gpio(as);
+
+	if (spi->cs_gpiod && as->native_cs_free) {
+		dev_err(&spi->dev,
+			"No native CS available to support this GPIO CS\n");
+		return -EBUSY;
+	}
+
+	if (spi->cs_gpiod)
+		chip_select = as->native_cs_for_gpio;
+	else
+		chip_select = spi->chip_select;
+
 	csr = SPI_BF(BITS, bits - 8);
 	if (spi->mode & SPI_CPOL)
 		csr |= SPI_BIT(CPOL);
@@ -1213,7 +1271,7 @@ static int atmel_spi_setup(struct spi_device *spi)
 		bits, spi->mode, spi->chip_select, csr);
 
 	if (!atmel_spi_is_v2(as))
-		spi_writel(as, CSR0 + 4 * spi->chip_select, csr);
+		spi_writel(as, CSR0 + 4 * chip_select, csr);
 
 	return 0;
 }
-- 
cgit v1.2.3-59-g8ed1b


From 9c86f12a36479dec06df3e4a4f31cecf8eba0222 Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@bootlin.com>
Date: Thu, 17 Oct 2019 16:18:46 +0200
Subject: spi: atmel: Improve CS0 case support on AT91RM9200

Thanks to the recent change in this driver, it is now possible to
prevent using the CS0 with GPIO during setup. It then allows to remove
the special handling of this case in the cs_activate() and
cs_deactivate() functions.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191017141846.7523-8-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index ac5e2ddf9e1b..d88e2aa64839 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -371,7 +371,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
 
 		mr = spi_readl(as, MR);
 		mr = SPI_BFINS(PCS, ~(1 << chip_select), mr);
-		if (spi->cs_gpiod && spi->chip_select != 0)
+		if (spi->cs_gpiod)
 			gpiod_set_value(spi->cs_gpiod, 1);
 		spi_writel(as, MR, mr);
 	}
@@ -402,7 +402,7 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
 
 	if (!spi->cs_gpiod)
 		spi_writel(as, CR, SPI_BIT(LASTXFER));
-	else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
+	else
 		gpiod_set_value(spi->cs_gpiod, 0);
 }
 
@@ -1193,7 +1193,16 @@ static void initialize_native_cs_for_gpio(struct atmel_spi *as)
 	if (!master->cs_gpiods)
 		return; /* No CS GPIO */
 
-	for (i = 0; i < 4; i++)
+	/*
+	 * On the first version of the controller (AT91RM9200), CS0
+	 * can't be used associated with GPIO
+	 */
+	if (atmel_spi_is_v2(as))
+		i = 0;
+	else
+		i = 1;
+
+	for (; i < 4; i++)
 		if (master->cs_gpiods[i])
 			as->native_cs_free |= BIT(i);
 
-- 
cgit v1.2.3-59-g8ed1b


From bef1e0c8f74c87e7427cb98b2e76caf046c7b65a Mon Sep 17 00:00:00 2001
From: Peter Ujfalusi <peter.ujfalusi@ti.com>
Date: Wed, 13 Nov 2019 11:42:49 +0200
Subject: spi: atmel: Use dma_request_chan() directly for channel request

dma_request_slave_channel_reason() is:
#define dma_request_slave_channel_reason(dev, name) \
	dma_request_chan(dev, name)

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20191113094256.1108-3-peter.ujfalusi@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 drivers/spi/spi-atmel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/spi/spi-atmel.c')

diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index d88e2aa64839..d692cc388126 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -512,7 +512,7 @@ static int atmel_spi_configure_dma(struct spi_master *master,
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
+	master->dma_tx = dma_request_chan(dev, "tx");
 	if (IS_ERR(master->dma_tx)) {
 		err = PTR_ERR(master->dma_tx);
 		if (err == -EPROBE_DEFER) {
-- 
cgit v1.2.3-59-g8ed1b