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Commit b0d92b94 authored by Wentao Liang's avatar Wentao Liang Committed by Greg Kroah-Hartman
Browse files

media: platform: exynos4-is: Add hardware sync wait to fimc_is_hw_change_mode() 



[ Upstream commit bd9f6ce7d512fa21249415c16af801a4ed5d97b6 ]

In fimc_is_hw_change_mode(), the function changes camera modes without
waiting for hardware completion, risking corrupted data or system hangs
if subsequent operations proceed before the hardware is ready.

Add fimc_is_hw_wait_intmsr0_intmsd0() after mode configuration, ensuring
hardware state synchronization and stable interrupt handling.

Signed-off-by: default avatarWentao Liang <vulab@iscas.ac.cn>
Signed-off-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 45f5a37b

drivers/media/platform/exynos4-is/fimc-is-regs.c

+1 −0
Original line number Diff line number Diff line
@@ -164,6 +164,7 @@ int fimc_is_hw_change_mode(struct fimc_is *is) 
	if (WARN_ON(is->config_index >= ARRAY_SIZE(cmd)))

		return -EINVAL;



	fimc_is_hw_wait_intmsr0_intmsd0(is);

	mcuctl_write(cmd[is->config_index], is, MCUCTL_REG_ISSR(0));

	mcuctl_write(is->sensor_index, is, MCUCTL_REG_ISSR(1));

	mcuctl_write(is->setfile.sub_index, is, MCUCTL_REG_ISSR(2));