path: root/drivers/staging/media/imx/imx6-mipi-csi2.c
diff options
authorEzequiel Garcia <>2019-06-27 19:29:12 -0300
committerMauro Carvalho Chehab <>2019-08-15 08:15:54 -0300
commit0d5078c7172c46db6c58718d817b9fcf769554b4 (patch)
treee98650f09a8bc0208239e7572368c896c71dc2c3 /drivers/staging/media/imx/imx6-mipi-csi2.c
parent9bf656e1a6b0709122ec3d71131171c92cf4cdae (diff)
media: imx: mipi csi-2: Don't fail if initial state times-out
Not all sensors will be able to guarantee a proper initial state. This may be either because the driver is not properly written, or (probably unlikely) because the hardware won't support it. While the right solution in the former case is to fix the sensor driver, the real world not always allows right solutions, due to lack of available documentation and support on these sensors. Let's relax this requirement, and allow the driver to support stream start, even if the sensor initial sequence wasn't the expected. Also improve the warning message to better explain the problem and provide a hint that the sensor driver needs to be fixed. Signed-off-by: Ezequiel Garcia <> Signed-off-by: Fabio Estevam <> Reviewed-by: Steve Longerbeam <> Reviewed-by: Philipp Zabel <> Signed-off-by: Sakari Ailus <> Signed-off-by: Mauro Carvalho Chehab <>
Diffstat (limited to 'drivers/staging/media/imx/imx6-mipi-csi2.c')
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index f29e28df36ed..bfa4b254c4e4 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -243,7 +243,7 @@ static int __maybe_unused csi2_dphy_wait_ulp(struct csi2_dev *csi2)
/* Waits for low-power LP-11 state on data and clock lanes. */
-static int csi2_dphy_wait_stopstate(struct csi2_dev *csi2)
+static void csi2_dphy_wait_stopstate(struct csi2_dev *csi2)
u32 mask, reg;
int ret;
@@ -254,11 +254,9 @@ static int csi2_dphy_wait_stopstate(struct csi2_dev *csi2)
ret = readl_poll_timeout(csi2->base + CSI2_PHY_STATE, reg,
(reg & mask) == mask, 0, 500000);
if (ret) {
- v4l2_err(&csi2->sd, "LP-11 timeout, phy_state = 0x%08x\n", reg);
- return ret;
+ v4l2_warn(&csi2->sd, "LP-11 wait timeout, likely a sensor driver bug, expect capture failures.\n");
+ v4l2_warn(&csi2->sd, "phy_state = 0x%08x\n", reg);
- return 0;
/* Wait for active clock on the clock lane. */
@@ -316,9 +314,7 @@ static int csi2_start(struct csi2_dev *csi2)
csi2_enable(csi2, true);
/* Step 5 */
- ret = csi2_dphy_wait_stopstate(csi2);
- if (ret)
- goto err_assert_reset;
+ csi2_dphy_wait_stopstate(csi2);
/* Step 6 */
ret = v4l2_subdev_call(csi2->src_sd, video, s_stream, 1);