diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index d1b3ba2b1532..5fe6099ff366 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -94,6 +94,7 @@ #define CR0_BHT_8BIT 0x1 #define CR0_RSD_OFFSET 14 +#define CR0_RSD_MAX 0x3 #define CR0_FRF_OFFSET 16 #define CR0_FRF_SPI 0x0 @@ -179,7 +180,7 @@ struct rockchip_spi { u32 freq; u8 n_bytes; - u32 rsd_nsecs; + u8 rsd; const void *tx; const void *tx_end; @@ -450,13 +451,13 @@ static void rockchip_spi_config(struct rockchip_spi *rs, bool use_dma) { u32 dmacr = 0; - int rsd = 0; u32 cr0 = CR0_FRF_SPI << CR0_FRF_OFFSET | CR0_BHT_8BIT << CR0_BHT_OFFSET | CR0_SSD_ONE << CR0_SSD_OFFSET | CR0_EM_BIG << CR0_EM_OFFSET; + cr0 |= rs->rsd << CR0_RSD_OFFSET; cr0 |= (rs->n_bytes << CR0_DFS_OFFSET); cr0 |= (spi->mode & 0x3U) << CR0_SCPH_OFFSET; @@ -474,20 +475,6 @@ static void rockchip_spi_config(struct rockchip_spi *rs, dmacr |= RF_DMA_EN; } - /* Rx sample delay is expressed in parent clock cycles (max 3) */ - rsd = DIV_ROUND_CLOSEST(rs->rsd_nsecs * (rs->freq >> 8), - 1000000000 >> 8); - if (!rsd && rs->rsd_nsecs) { - pr_warn_once("rockchip-spi: %u Hz are too slow to express %u ns delay\n", - rs->freq, rs->rsd_nsecs); - } else if (rsd > 3) { - rsd = 3; - pr_warn_once("rockchip-spi: %u Hz are too fast to express %u ns delay, clamping at %u ns\n", - rs->freq, rs->rsd_nsecs, - rsd * 1000000000U / rs->freq); - } - cr0 |= rsd << CR0_RSD_OFFSET; - writel_relaxed(cr0, rs->regs + ROCKCHIP_SPI_CTRLR0); if (rs->n_bytes == 1) @@ -620,8 +607,21 @@ static int rockchip_spi_probe(struct platform_device *pdev) rs->freq = clk_get_rate(rs->spiclk); if (!of_property_read_u32(pdev->dev.of_node, "rx-sample-delay-ns", - &rsd_nsecs)) - rs->rsd_nsecs = rsd_nsecs; + &rsd_nsecs)) { + /* rx sample delay is expressed in parent clock cycles (max 3) */ + u32 rsd = DIV_ROUND_CLOSEST(rsd_nsecs * (rs->freq >> 8), + 1000000000 >> 8); + if (!rsd) { + dev_warn(rs->dev, "%u Hz are too slow to express %u ns delay\n", + rs->freq, rsd_nsecs); + } else if (rsd > CR0_RSD_MAX) { + rsd = CR0_RSD_MAX; + dev_warn(rs->dev, "%u Hz are too fast to express %u ns delay, clamping at %u ns\n", + rs->freq, rsd_nsecs, + CR0_RSD_MAX * 1000000000U / rs->freq); + } + rs->rsd = rsd; + } rs->fifo_len = get_fifo_len(rs); if (!rs->fifo_len) { |