From: Naushir Patuck <naush@xxxxxxxxxxxxxxx>
[ Upstream commit 697a252bb2ea414cc1c0b4cf4e3d94a879eaf162 ]
The imx219/imx708 sensors frequently generate a single corrupt frame
(image or embedded data) when the sensor first starts. This can either
be a missing line, or invalid samples within the line. This only occurrs
using the upstream Unicam kernel driver.
Disabling trigger mode elimiates this corruption. Since trigger mode is
a legacy feature copied from the firmware driver and not expected to be
needed, remove it. Tested on the Raspberry Pi cameras and shows no ill
effects.
Signed-off-by: Naushir Patuck <naush@xxxxxxxxxxxxxxx>
Reviewed-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/media/platform/broadcom/bcm2835-unicam.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c
index 3aed0e493c81f..4090a8e477402 100644
--- a/drivers/media/platform/broadcom/bcm2835-unicam.c
+++ b/drivers/media/platform/broadcom/bcm2835-unicam.c
@@ -816,11 +816,6 @@ static irqreturn_t unicam_isr(int irq, void *dev)
}
}
- if (unicam_reg_read(unicam, UNICAM_ICTL) & UNICAM_FCM) {
- /* Switch out of trigger mode if selected */
- unicam_reg_write_field(unicam, UNICAM_ICTL, 1, UNICAM_TFC);
- unicam_reg_write_field(unicam, UNICAM_ICTL, 0, UNICAM_FCM);
- }
return IRQ_HANDLED;
}
@@ -984,8 +979,7 @@ static void unicam_start_rx(struct unicam_device *unicam,
unicam_reg_write_field(unicam, UNICAM_ANA, 0, UNICAM_DDL);
- /* Always start in trigger frame capture mode (UNICAM_FCM set) */
- val = UNICAM_FSIE | UNICAM_FEIE | UNICAM_FCM | UNICAM_IBOB;
+ val = UNICAM_FSIE | UNICAM_FEIE | UNICAM_IBOB;
line_int_freq = max(fmt->height >> 2, 128);
unicam_set_field(&val, line_int_freq, UNICAM_LCIE_MASK);
unicam_reg_write(unicam, UNICAM_ICTL, val);
--
2.39.5
