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[03/14] media: sun4i-csi: Fix data sampling polarity handling

Message ID 20191215165924.28314-4-wens@kernel.org (mailing list archive)
State New, archived
Headers show
Series media: sun4i-csi: A10/A20 CSI1 and R40 CSI0 support | expand

Commit Message

Chen-Yu Tsai Dec. 15, 2019, 4:59 p.m. UTC 
From: Chen-Yu Tsai <wens@csie.org>

The CLK_POL field specifies whether data is sampled on the falling or
rising edge of PCLK, not whether the data lines are active high or low.
Evidence of this can be found in the timing diagram labeled "horizontal
size setting and pixel clock timing".

Fix the setting by checking the correct flag, V4L2_MBUS_PCLK_SAMPLE_RISING.
While at it, reorder the three polarity flag checks so HSYNC and VSYNC
are grouped together.

Fixes: 577bbf23b758 ("media: sunxi: Add A10 CSI driver")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
 drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Maxime Ripard Dec. 16, 2019, 1:36 p.m. UTC | #1 
On Mon, Dec 16, 2019 at 12:59:13AM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@csie.org>
>
> The CLK_POL field specifies whether data is sampled on the falling or
> rising edge of PCLK, not whether the data lines are active high or low.
> Evidence of this can be found in the timing diagram labeled "horizontal
> size setting and pixel clock timing".
>
> Fix the setting by checking the correct flag, V4L2_MBUS_PCLK_SAMPLE_RISING.
> While at it, reorder the three polarity flag checks so HSYNC and VSYNC
> are grouped together.
>
> Fixes: 577bbf23b758 ("media: sunxi: Add A10 CSI driver")
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Acked-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime
diff mbox series

Patch

diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
index d6979e11a67b..8b567d0f019b 100644
--- a/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_dma.c
@@ -279,8 +279,8 @@  static int sun4i_csi_start_streaming(struct vb2_queue *vq, unsigned int count)
 	       csi->regs + CSI_WIN_CTRL_H_REG);
 
 	hsync_pol = !!(bus->flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH);
-	pclk_pol = !!(bus->flags & V4L2_MBUS_DATA_ACTIVE_HIGH);
 	vsync_pol = !!(bus->flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH);
+	pclk_pol = !!(bus->flags & V4L2_MBUS_PCLK_SAMPLE_RISING);
 	writel(CSI_CFG_INPUT_FMT(csi_fmt->input) |
 	       CSI_CFG_OUTPUT_FMT(csi_fmt->output) |
 	       CSI_CFG_VSYNC_POL(vsync_pol) |