Messages in this thread Patch in this message | | | From | Hsin-Yi Wang <> | Subject | [PATCH v3] gpu/drm: mediatek: call mtk_dsi_stop() after mtk_drm_crtc_atomic_disable() | Date | Tue, 28 May 2019 15:39:08 +0800 |
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mtk_dsi_stop() should be called after mtk_drm_crtc_atomic_disable(), which needs ovl irq for drm_crtc_wait_one_vblank(), since after mtk_dsi_stop() is called, ovl irq will be disabled. If drm_crtc_wait_one_vblank() is called after last irq, it will timeout with this message: "vblank wait timed out on crtc 0". This happens sometimes when turning off the screen.
In drm_atomic_helper.c#disable_outputs(), the calling sequence when turning off the screen is:
1. mtk_dsi_encoder_disable() --> mtk_output_dsi_disable() --> mtk_dsi_stop(); // sometimes make vblank timeout in atomic_disable --> mtk_dsi_poweroff(); 2. mtk_drm_crtc_atomic_disable() --> drm_crtc_wait_one_vblank(); ... --> mtk_dsi_ddp_stop() --> mtk_dsi_poweroff();
mtk_dsi_poweroff() has reference count design, change to make mtk_dsi_stop() called in mtk_dsi_poweroff() when refcount is 0.
Fixes: 0707632b5bac ("drm/mediatek: update DSI sub driver flow for sending commands to panel") Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> --- change log v2->v3: * remove unnecessary codes in unbind * based on discussion in v2, if we move mtk_dsi_start() to mtk_dsi_poweron(), in order to make mtk_dsi_start() and mtk_dsi_stop() symmetric, will results in no irq for panel with bridge. So we keep mtk_dsi_start() in original place. --- drivers/gpu/drm/mediatek/mtk_dsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index b00eb2d2e086..b7f829ecd3ad 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -630,6 +630,8 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi) if (--dsi->refcount != 0) return; + mtk_dsi_stop(dsi); + if (!mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) { if (dsi->panel) { if (drm_panel_unprepare(dsi->panel)) { @@ -696,7 +698,6 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi) } } - mtk_dsi_stop(dsi); mtk_dsi_poweroff(dsi); dsi->enabled = false; -- 2.20.1
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