linux/drivers/reset/reset-imx7.c
Robby Cai 7182777666 reset: imx7: Correct polarity of MIPI CSI resets on i.MX8MQ
On i.MX8MQ, the MIPI CSI reset lines are active-low and not self-clearing.
Writing '0' asserts reset and it remains asserted until explicitly
deasserted by software.

This driver previously treated the MIPI CSI reset signals as active-high,
which led to incorrect reset assert/deassert sequencing. This issue was
exposed by commit 6d79bb8fd2 ("media: imx8mq-mipi-csi2: Explicitly
release reset").

Fix this by reflecting the correct reset polarity and ensuring proper
reset handling.

Fixes: c979dbf599 ("reset: imx7: Add support for i.MX8MQ IP block variant")
Cc: stable@vger.kernel.org # 6d79bb8fd2: media: imx8mq-mipi-csi2: Explicitly release reset
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Robby Cai <robby.cai@nxp.com>
Reviewed-by: Guoniu Zhou <guoniu.zhou@oss.nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
2026-07-01 15:08:14 +02:00

413 lines
14 KiB