From: Tomi Valkeinen tomi.valkeinen@ideasonboard.com
[ Upstream commit c079e2e113f2ec2803ba859bbb442a6ab82c96bd ]
A sync lost issue can be observed with two displays, when moving a plane from one disabled display to an another disabled display, and then enabling the display to which the plane was moved to. The exact requirements for this to trigger are not clear.
It looks like the issue is that the layers are left enabled in the first display's OVR registers. Even if the corresponding VP is disabled, it still causes an issue, as if the disabled VP and its OVR would still be in use, leading to the same VID being used by two OVRs. However, this is just speculation based on testing the DSS behavior.
Experimentation shows that as a workaround, we can disable all the layers in the OVR when disabling a VP. There should be no downside to this, as the OVR is anyway effectively disabled if its VP is disabled, and it seems to solve the sync lost issue.
However, there may be a bigger issue in play here, related to J721e erratum i2097 ("DSS: Disabling a Layer Connected to Overlay May Result in Synclost During the Next Frame"). Experimentation also shows that the OVR's CHANNELIN field has similar issue. So we may need to revisit this when we find out more about the core issue.
Fixes: 32a1795f57ee ("drm/tidss: New driver for TI Keystone platform Display SubSystem") Reviewed-by: Aradhya Bhatia a-bhatia1@ti.com Signed-off-by: Tomi Valkeinen tomi.valkeinen@ideasonboard.com Link: https://patchwork.freedesktop.org/patch/msgid/20240213-tidss-fixes-v1-2-d709... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/tidss/tidss_crtc.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tidss_crtc.c index 7c78c074e3a2e..1baa4ace12e15 100644 --- a/drivers/gpu/drm/tidss/tidss_crtc.c +++ b/drivers/gpu/drm/tidss/tidss_crtc.c @@ -269,6 +269,16 @@ static void tidss_crtc_atomic_disable(struct drm_crtc *crtc,
reinit_completion(&tcrtc->framedone_completion);
+ /* + * If a layer is left enabled when the videoport is disabled, and the + * vid pipeline that was used for the layer is taken into use on + * another videoport, the DSS will report sync lost issues. Disable all + * the layers here as a work-around. + */ + for (u32 layer = 0; layer < tidss->feat->num_planes; layer++) + dispc_ovr_enable_layer(tidss->dispc, tcrtc->hw_videoport, layer, + false); + dispc_vp_disable(tidss->dispc, tcrtc->hw_videoport);
if (!wait_for_completion_timeout(&tcrtc->framedone_completion,