From 6798d04205d171df94b016163b13094179878d67 Mon Sep 17 00:00:00 2001 From: Lewis Huang Date: Thu, 30 Jul 2020 18:00:23 +0800 Subject: [PATCH] drm/amd/display: Add extra T3 delay [Why] For some special panel, it will have an invalid HPD high cause driver DPCD read/write fail. [How] Add extra T3 delay as a monitor patch in dce110_edp_wait_for_hpd_ready Signed-off-by: Lewis Huang Reviewed-by: Anthony Koo Acked-by: Rodrigo Siqueira Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/dc_types.h | 1 + drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h index 946ba92..aa8e095 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_types.h @@ -233,6 +233,7 @@ struct dc_panel_patch { unsigned int skip_scdc_overwrite; unsigned int delay_ignore_msa; unsigned int disable_fec; + unsigned int extra_t3_ms; }; struct dc_edid_caps { diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c index 45c9e90..0603ddc 100644 --- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c +++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c @@ -720,6 +720,7 @@ void dce110_edp_wait_for_hpd_ready( struct dc_context *ctx = link->ctx; struct graphics_object_id connector = link->link_enc->connector; struct gpio *hpd; + struct dc_sink *sink = link->local_sink; bool edp_hpd_high = false; uint32_t time_elapsed = 0; uint32_t timeout = power_up ? @@ -752,6 +753,14 @@ void dce110_edp_wait_for_hpd_ready( return; } + if (sink != NULL) { + if (sink->edid_caps.panel_patch.extra_t3_ms > 0) { + int extra_t3_in_ms = sink->edid_caps.panel_patch.extra_t3_ms; + + msleep(extra_t3_in_ms); + } + } + dal_gpio_open(hpd, GPIO_MODE_INTERRUPT); /* wait until timeout or panel detected */ -- 2.7.4