Re: [PATCH v9 07/13] media: cadence: csi2rx: Soft reset the streams before starting capture

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On 11/08/2023 13:47, Jai Luthra wrote:
From: Pratyush Yadav <p.yadav@xxxxxx>

This resets the stream state machines and FIFOs, giving them a clean
slate. On J721E if the streams are not reset before starting the
capture, the captured frame gets wrapped around vertically on every run
after the first.

Signed-off-by: Pratyush Yadav <p.yadav@xxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
Signed-off-by: Jai Luthra <j-luthra@xxxxxx>
---
Changes from v8:
     - Simplify reset sequence, minimizing delays

  drivers/media/platform/cadence/cdns-csi2rx.c | 14 +++++++++++++-
  1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 933edec89520..b57e0c3b1944 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -40,6 +40,7 @@
  #define CSI2RX_STREAM_BASE(n)		(((n) + 1) * 0x100)
#define CSI2RX_STREAM_CTRL_REG(n) (CSI2RX_STREAM_BASE(n) + 0x000)
+#define CSI2RX_STREAM_CTRL_SOFT_RST			BIT(4)
  #define CSI2RX_STREAM_CTRL_START			BIT(0)
#define CSI2RX_STREAM_DATA_CFG_REG(n) (CSI2RX_STREAM_BASE(n) + 0x008)
@@ -134,12 +135,23 @@ struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
static void csi2rx_reset(struct csi2rx_priv *csi2rx)
  {
+	unsigned int i;
+
+	/* Reset module */
  	writel(CSI2RX_SOFT_RESET_PROTOCOL | CSI2RX_SOFT_RESET_FRONT,
  	       csi2rx->base + CSI2RX_SOFT_RESET_REG);
+	/* Reset individual streams. */
+	for (i = 0; i < csi2rx->max_streams; i++) {
+		writel(CSI2RX_STREAM_CTRL_SOFT_RST,
+		       csi2rx->base + CSI2RX_STREAM_CTRL_REG(i));
+	}
- udelay(10);
+	usleep_range(10, 20);
+ /* Clear resets */
  	writel(0, csi2rx->base + CSI2RX_SOFT_RESET_REG);
+	for (i = 0; i < csi2rx->max_streams; i++)
+		writel(0, csi2rx->base + CSI2RX_STREAM_CTRL_REG(i));
  }
static int csi2rx_configure_ext_dphy(struct csi2rx_priv *csi2rx)


Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>

 Tomi




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