| Message ID | 20231023-display-support-v4-11-ed82eb168fb1@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add display support for the MT8365-EVK board | expand |
Hi, Shuijing: Please help to review this patch. Regards, Chun-Kuang. Alexandre Mergnat <amergnat@baylibre.com> 於 2024年5月23日 週四 下午8:49寫道： > > Currently, mtk_dsi_lane_ready (which setup the DSI lane) is triggered > before mtk_dsi_poweron. lanes_ready flag toggle to true during > mtk_dsi_lane_ready function, and the DSI module is set up during > mtk_dsi_poweron. > > Later, during panel driver init, mtk_dsi_lane_ready is triggered but does > nothing because lanes are considered ready. Unfortunately, when the panel > driver try to communicate, the DSI returns a timeout. > > The solution found here is to put lanes_ready flag to false after the DSI > module setup into mtk_dsi_poweron to init the DSI lanes after the power / > setup of the DSI module. > > Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com> > --- > drivers/gpu/drm/mediatek/mtk_dsi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c > index e036d9394c23..cb546a9e9419 100644 > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c > @@ -643,6 +643,8 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi) > mtk_dsi_config_vdo_timing(dsi); > mtk_dsi_set_interrupt_enable(dsi); > > + dsi->lanes_ready = false; > + > return 0; > err_disable_engine_clk: > clk_disable_unprepare(dsi->engine_clk); > > -- > 2.25.1 >
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index e036d9394c23..cb546a9e9419 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -643,6 +643,8 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi) mtk_dsi_config_vdo_timing(dsi); mtk_dsi_set_interrupt_enable(dsi); + dsi->lanes_ready = false; + return 0; err_disable_engine_clk: clk_disable_unprepare(dsi->engine_clk);
Currently, mtk_dsi_lane_ready (which setup the DSI lane) is triggered before mtk_dsi_poweron. lanes_ready flag toggle to true during mtk_dsi_lane_ready function, and the DSI module is set up during mtk_dsi_poweron. Later, during panel driver init, mtk_dsi_lane_ready is triggered but does nothing because lanes are considered ready. Unfortunately, when the panel driver try to communicate, the DSI returns a timeout. The solution found here is to put lanes_ready flag to false after the DSI module setup into mtk_dsi_poweron to init the DSI lanes after the power / setup of the DSI module. Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com> --- drivers/gpu/drm/mediatek/mtk_dsi.c | 2 ++ 1 file changed, 2 insertions(+)