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drm/amd/display: Add extra T3 delay

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[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 <Lewis.Huang@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Lewis Huang
2020-07-30 18:00:23 +08:00
committed by Alex Deucher
parent bcc6aa61c8
commit 6798d04205
2 changed files with 10 additions and 0 deletions
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1
drivers/gpu/drm/amd/display/dc/dc_types.h
View File

@ -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 {

9
drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
View File

@ -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 */