[Public]
[Why]
Sometimes, DP receiver chip power-controlled externally by an
Embedded Controller could be treated and used as eDP,
if it drives mobile display. In this case,
we shouldn't be doing power-sequencing, hence we can skip
waiting for T7-ready and T9-ready."
[How]
Added a feature mask to enable eDP no power sequencing feature.
To enable this, set 0x10 flag in amdgpu.dcfeaturemask on
Linux command line.
Signed-off-by: Zhan Liu <zhan.liu@xxxxxxx>
Change-Id: I15e8fb2979fe3ff5491ccf1ee384693d4dce787c
---
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 1 +
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++
drivers/gpu/drm/amd/display/dc/dc.h | 1 +
.../display/dc/dce110/dce110_hw_sequencer.c | 31 ++++++++++++++++---
drivers/gpu/drm/amd/include/amd_shared.h | 10 +++---
5 files changed, 38 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 3de1accb060e..b588cf4398db 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -159,6 +159,7 @@ int amdgpu_smu_pptable_id = -1;
* highest. That helps saving some idle power.
* DISABLE_FRACTIONAL_PWM (bit 2) disabled by default
* PSR (bit 3) disabled by default
+ * EDP NO POWER SEQUENCING (bit 4) disabled by default
*/
uint amdgpu_dc_feature_mask = 2;
uint amdgpu_dc_debug_mask;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index c0a3119982b0..abba26c8f20a 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1174,6 +1174,9 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
if (amdgpu_dc_feature_mask & DC_DISABLE_FRACTIONAL_PWM_MASK)
init_data.flags.disable_fractional_pwm = true;
+ if (amdgpu_dc_feature_mask & DC_EDP_NO_POWER_SEQUENCING)
+ init_data.flags.edp_no_power_sequencing = true;
+
init_data.flags.power_down_display_on_boot = true;
INIT_LIST_HEAD(&adev->dm.da_list);
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index a70697898025..7f1d2d6f9de8 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -297,6 +297,7 @@ struct dc_config {
bool allow_seamless_boot_optimization;
bool power_down_display_on_boot;
bool edp_not_connected;
+ bool edp_no_power_sequencing;
bool force_enum_edp;
bool forced_clocks;
bool allow_lttpr_non_transparent_mode;
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 53dd305fa6b0..013d94c9506a 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
@@ -1023,8 +1023,20 @@ void dce110_edp_backlight_control(
/* dc_service_sleep_in_milliseconds(50); */
/*edp 1.2*/
panel_instance = link->panel_cntl->inst;
- if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_ON)
- edp_receiver_ready_T7(link);
+
+ if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_ON) {
+ if (!link->dc->config.edp_no_power_sequencing)
+ /*
+ * Sometimes, DP receiver chip power-controlled externally by an
+ * Embedded Controller could be treated and used as eDP,
+ * if it drives mobile display. In this case,
+ * we shouldn't be doing power-sequencing, hence we can skip
+ * waiting for T7-ready.
+ */
+ edp_receiver_ready_T7(link);
+ else
+ DC_LOG_DC("edp_receiver_ready_T7 skipped\n");
+ }
if (ctx->dc->ctx->dmub_srv &&
ctx->dc->debug.dmub_command_table) {
@@ -1049,8 +1061,19 @@ void dce110_edp_backlight_control(
dc_link_backlight_enable_aux(link, enable);
/*edp 1.2*/
- if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_OFF)
- edp_add_delay_for_T9(link);
+ if (cntl.action == TRANSMITTER_CONTROL_BACKLIGHT_OFF) {
+ if (!link->dc->config.edp_no_power_sequencing)
+ /*
+ * Sometimes, DP receiver chip power-controlled externally by an
+ * Embedded Controller could be treated and used as eDP,
+ * if it drives mobile display. In this case,
+ * we shouldn't be doing power-sequencing, hence we can skip
+ * waiting for T9-ready.
+ */
+ edp_add_delay_for_T9(link);
+ else
+ DC_LOG_DC("edp_receiver_ready_T9 skipped\n");
+ }
if (!enable && link->dpcd_sink_ext_caps.bits.oled)
msleep(OLED_PRE_T11_DELAY);
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index 9ab706cd07ff..d326339cb3cd 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -223,10 +223,12 @@ enum amd_harvest_ip_mask {
};
enum DC_FEATURE_MASK {
- DC_FBC_MASK = 0x1,
- DC_MULTI_MON_PP_MCLK_SWITCH_MASK = 0x2,
- DC_DISABLE_FRACTIONAL_PWM_MASK = 0x4,
- DC_PSR_MASK = 0x8,
+ //Default value can be found at "uint amdgpu_dc_feature_mask"
+ DC_FBC_MASK = (1 << 0), //0x1, disabled by default
+ DC_MULTI_MON_PP_MCLK_SWITCH_MASK = (1 << 1), //0x2, enabled by default
+ DC_DISABLE_FRACTIONAL_PWM_MASK = (1 << 2), //0x4, disabled by default
+ DC_PSR_MASK = (1 << 3), //0x8, disabled by default
+ DC_EDP_NO_POWER_SEQUENCING = (1 << 4), //0x10, disabled by default
};
enum DC_DEBUG_MASK {
--
2.25.1
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