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Date: Mon, 7 Mar 2022 10:17:07 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Sean Paul <seanpaul@...omium.org>, Rob Clark <robdclark@...omium.org>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, Alex Deucher <alexander.deucher@....com>, Liu Ying <victor.liu@....com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.15 083/262] drm/atomic: Check new_crtc_state->active to determine if CRTC needs disable in self refresh mode From: Liu Ying <victor.liu@....com> [ Upstream commit 69e630016ef4e4a1745310c446f204dc6243e907 ] Actual hardware state of CRTC is controlled by the member 'active' in struct drm_crtc_state instead of the member 'enable', according to the kernel doc of the member 'enable'. In fact, the drm client modeset and atomic helpers are using the member 'active' to do the control. Referencing the member 'enable' of new_crtc_state, the function crtc_needs_disable() may fail to reflect if CRTC needs disable in self refresh mode, e.g., when the framebuffer emulation will be blanked through the client modeset helper with the next commit, the member 'enable' of new_crtc_state is still true while the member 'active' is false, hence the relevant potential encoder and bridges won't be disabled. So, let's check new_crtc_state->active to determine if CRTC needs disable in self refresh mode instead of new_crtc_state->enable. Fixes: 1452c25b0e60 ("drm: Add helpers to kick off self refresh mode in drivers") Cc: Sean Paul <seanpaul@...omium.org> Cc: Rob Clark <robdclark@...omium.org> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com> Cc: Maxime Ripard <mripard@...nel.org> Cc: Thomas Zimmermann <tzimmermann@...e.de> Cc: David Airlie <airlied@...ux.ie> Cc: Daniel Vetter <daniel@...ll.ch> Reviewed-by: Alex Deucher <alexander.deucher@....com> Signed-off-by: Liu Ying <victor.liu@....com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Link: https://patchwork.freedesktop.org/patch/msgid/20211230040626.646807-1-victor.liu@nxp.com Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/gpu/drm/drm_atomic_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index 2c0c6ec928200..ff2bc9a118011 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -1001,7 +1001,7 @@ crtc_needs_disable(struct drm_crtc_state *old_state, * it's in self refresh mode and needs to be fully disabled. */ return old_state->active || - (old_state->self_refresh_active && !new_state->enable) || + (old_state->self_refresh_active && !new_state->active) || new_state->self_refresh_active; } -- 2.34.1
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