i2c: designware: Detect the FIFO size in the common code

The problem with detecting the FIFO depth in the platform driver
is that in order to implement this we have to access the controller
IC_COMP_PARAM_1 register. Currently it's done before the
i2c_dw_set_reg_access() method execution, which is errors prone since
the method determines the registers endianness and access mode and we
can't use dw_readl/dw_writel accessors before this information is
retrieved. We also can't move the i2c_dw_set_reg_access() function
invocation to after the master/slave probe functions call (when endianness
and access mode are determined), since the FIFO depth information is used
by them for initializations. So in order to fix the problem we have no
choice but to move the FIFO size detection methods to the common code and
call it at the probe stage.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 0 insertions, 24 deletions

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 3b7d58c2fe85..cb494273bb60 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -219,28 +219,6 @@ static void i2c_dw_configure_slave(struct dw_i2c_dev *dev)
 	dev->mode = DW_IC_SLAVE;
 }
 
-static void dw_i2c_set_fifo_size(struct dw_i2c_dev *dev)
-{
-	u32 param, tx_fifo_depth, rx_fifo_depth;
-
-	/*
-	 * Try to detect the FIFO depth if not set by interface driver,
-	 * the depth could be from 2 to 256 from HW spec.
-	 */
-	param = i2c_dw_read_comp_param(dev);
-	tx_fifo_depth = ((param >> 16) & 0xff) + 1;
-	rx_fifo_depth = ((param >> 8)  & 0xff) + 1;
-	if (!dev->tx_fifo_depth) {
-		dev->tx_fifo_depth = tx_fifo_depth;
-		dev->rx_fifo_depth = rx_fifo_depth;
-	} else if (tx_fifo_depth >= 2) {
-		dev->tx_fifo_depth = min_t(u32, dev->tx_fifo_depth,
-				tx_fifo_depth);
-		dev->rx_fifo_depth = min_t(u32, dev->rx_fifo_depth,
-				rx_fifo_depth);
-	}
-}
-
 static void dw_i2c_plat_pm_cleanup(struct dw_i2c_dev *dev)
 {
 	pm_runtime_disable(dev->dev);
@@ -362,8 +340,6 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 				div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000);
 	}
 
-	dw_i2c_set_fifo_size(dev);
-
 	adap = &dev->adapter;
 	adap->owner = THIS_MODULE;
 	adap->class = I2C_CLASS_DEPRECATED;