On Friday, January 23, 2026 1:05:28 AM Central European Standard Time Hamza
Mahfooz wrote:
> We now have a means to respond to page flip timeouts. So, hook up
> support for the new page_flip_timeout() callback.
>
> Signed-off-by: Hamza Mahfooz <[email protected]>
> ---
> Hi,
>
> I have tested this on 7940HS system and it appears even a MODE2 reset
> will reset display firmware, so I don't think we need to force a full
> reset here.
> ---
MODE2 reset _is_ a full reset on APUs, it resets everything but just doesn't
lose the RAM contents. Also note that MODE2 reset is not supported on
dedicated GPUs, so this will likely trigger a full reset for those.
Can you say how you tested this? I'd be happy to test it myself too.
> drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c | 2 ++
> drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h | 1 +
> .../drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c | 18 ++++++++++++++++++
> 3 files changed, 21 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c index
> 28c4ad62f50e..bd63f0345984 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c
> @@ -343,6 +343,8 @@ void amdgpu_reset_get_desc(struct amdgpu_reset_context
> *rst_ctxt, char *buf, case AMDGPU_RESET_SRC_USERQ:
> strscpy(buf, "user queue trigger", len);
> break;
> + case AMDGPU_RESET_SRC_DISPLAY:
> + strscpy(buf, "display hang", len);
> default:
> strscpy(buf, "unknown", len);
> }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h index
> 07b4d37f1db6..53b577062b11 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_reset.h
> @@ -44,6 +44,7 @@ enum AMDGPU_RESET_SRCS {
> AMDGPU_RESET_SRC_HWS,
> AMDGPU_RESET_SRC_USER,
> AMDGPU_RESET_SRC_USERQ,
> + AMDGPU_RESET_SRC_DISPLAY,
> };
>
> struct amdgpu_reset_context {
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c index
> 697e232acebf..2233e5b3b6a2 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c
> @@ -28,6 +28,7 @@
>
> #include "dc.h"
> #include "amdgpu.h"
> +#include "amdgpu_reset.h"
> #include "amdgpu_dm_psr.h"
> #include "amdgpu_dm_replay.h"
> #include "amdgpu_dm_crtc.h"
> @@ -578,12 +579,29 @@ amdgpu_dm_atomic_crtc_get_property(struct drm_crtc
> *crtc, }
> #endif
>
> +static void amdgpu_dm_crtc_handle_timeout(struct drm_crtc *crtc)
> +{
> + struct amdgpu_device *adev = drm_to_adev(crtc->dev);
> + struct amdgpu_reset_context reset_context = {0};
> +
> + if (amdgpu_device_should_recover_gpu(adev)) {
> + memset(&reset_context, 0, sizeof(reset_context));
> +
> + reset_context.method = AMD_RESET_METHOD_NONE;
> + reset_context.reset_req_dev = adev;
> + reset_context.src = AMDGPU_RESET_SRC_DISPLAY;
> +
> + amdgpu_device_gpu_recover(adev, NULL, &reset_context);
> + }
> +}
> +
> /* Implemented only the options currently available for the driver */
> static const struct drm_crtc_funcs amdgpu_dm_crtc_funcs = {
> .reset = amdgpu_dm_crtc_reset_state,
> .destroy = amdgpu_dm_crtc_destroy,
> .set_config = drm_atomic_helper_set_config,
> .page_flip = drm_atomic_helper_page_flip,
> + .page_flip_timeout = amdgpu_dm_crtc_handle_timeout,
> .atomic_duplicate_state = amdgpu_dm_crtc_duplicate_state,
> .atomic_destroy_state = amdgpu_dm_crtc_destroy_state,
> .set_crc_source = amdgpu_dm_crtc_set_crc_source,
