It has been observed through repeated testing (250 boots) that in the
10% of the cases the RDACM21 initialization sequence errors out due a
timeout waiting for the OV490 firmware to complete its boot phase.
Albeit being the current timeout relatively large (300-600 milliseconds),
doubling it reduces the sporadic error rate down to 1 over an 80 boot
sequences test run.
The firmware boot delay is unfortunately not characterized in the camera
module manual.
Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module")
Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
drivers/media/i2c/rdacm21.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
index 50a9b0d8255d..07cf077d8efd 100644
--- a/drivers/media/i2c/rdacm21.c
+++ b/drivers/media/i2c/rdacm21.c
@@ -53,7 +53,7 @@
#define OV490_PID 0x8080300a
#define OV490_VER 0x8080300b
#define OV490_PID_TIMEOUT 20
-#define OV490_OUTPUT_EN_TIMEOUT 300
+#define OV490_OUTPUT_EN_TIMEOUT 600
#define OV490_GPIO0 BIT(0)
#define OV490_SPWDN0 BIT(0)
--
2.30.0
