FROMLIST: media: iris: reset AHB bridge before enabling HW mode - #1907
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When video power domain is switched from software-controlled mode to hardware-controlled mode, the core may be powered down without the AHB bridge going through the required reset sequence. This may leave the bridge FIFO in a stale state. Reset the CPU-to-VPU AHB bridge before switching the power domain to hardware-controlled mode. This ensures that the bridge FIFO are in reset state before going for mode switch. Link: https://lore.kernel.org/all/20260924-vpu_hwmode_fix-v1-1-531498f3499a@oss.qualcomm.com/ Reported-by: Birk Skyum <birk.skyum@pm.me> Link: https://lore.kernel.org/all/20260913194707.91885-1-birk.skyum@pm.me Fixes: 95a337f ("media: iris: switch to hardware mode after firmware boot") Cc: stable@vger.kernel.org Co-developed-by: Renjiang Han <renjiang.han@oss.qualcomm.com> Signed-off-by: Renjiang Han <renjiang.han@oss.qualcomm.com> Signed-off-by: Vikash Garodia <vikash.garodia@oss.qualcomm.com> Reviewed-by: Vishnu Reddy <busanna.reddy@oss.qualcomm.com> Tested-by: Birk Skyum <birk.skyum@pm.me> # Lenovo Yoga Slim 7x
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September 24, 2026 17:31
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When video power domain is switched from software-controlled mode to hardware-controlled mode, the core may be powered down without the AHB bridge going through the required reset sequence. This may leave the bridge FIFO in a stale state.
Reset the CPU-to-VPU AHB bridge before switching the power domain to hardware-controlled mode. This ensures that the bridge FIFO are in reset state before going for mode switch.