[PATCH 1/2] drm/amd/display: Add pixel_clock to amd_pp_display_configuration

Rosen Penev
2026-02-25T23:34:01Z

From: Timur Kristóf <timur.kristof@gmail.com>

commit b515dcb0dc4e85d8254f5459cfb32fce88dacbfb upstream.

This commit adds the pixel_clock field to the display config
struct so that power management (DPM) can use it.

We currently don't have a proper bandwidth calculation on old
GPUs with DCE 6-10 because dce_calcs only supports DCE 11+.
So the power management (DPM) on these GPUs may need to make
ad-hoc decisions for display based on the pixel clock.

Also rename sym_clock to pixel_clock in dm_pp_single_disp_config
to avoid confusion with other code where the sym_clock refers to
the DisplayPort symbol clock.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c | 1 +
drivers/gpu/drm/amd/display/dc/clk_mgr/dce110/dce110_clk_mgr.c | 2 +-
drivers/gpu/drm/amd/display/dc/dm_services_types.h | 2 +-
drivers/gpu/drm/amd/include/dm_pp_interface.h | 1 +
4 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
index 848c5b4bb301..016230896d0e 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_pp_smu.c
@@ -97,6 +97,7 @@ bool dm_pp_apply_display_requirements(
const struct dm_pp_single_disp_config *dc_cfg =
&pp_display_cfg->disp_configs[i];
adev->pm.pm_display_cfg.displays[i].controller_id = dc_cfg->pipe_idx + 1;
+ adev->pm.pm_display_cfg.displays[i].pixel_clock = dc_cfg->pixel_clock;
}

amdgpu_dpm_display_configuration_change(adev, &adev->pm.pm_display_cfg);
diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dce110/dce110_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dce110/dce110_clk_mgr.c
index 13cf415e38e5..d50b9440210e 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dce110/dce110_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dce110/dce110_clk_mgr.c
@@ -164,7 +164,7 @@ void dce110_fill_display_configs(
stream->link->cur_link_settings.link_rate;
cfg->link_settings.link_spread =
stream->link->cur_link_settings.link_spread;
- cfg->sym_clock = stream->phy_pix_clk;
+ cfg->pixel_clock = stream->phy_pix_clk;
/* Round v_refresh*/
cfg->v_refresh = stream->timing.pix_clk_100hz * 100;
cfg->v_refresh /= stream->timing.h_total;
diff --git a/drivers/gpu/drm/amd/display/dc/dm_services_types.h b/drivers/gpu/drm/amd/display/dc/dm_services_types.h
index facf269c4326..b4eefe3ce7c7 100644
--- a/drivers/gpu/drm/amd/display/dc/dm_services_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dm_services_types.h
@@ -127,7 +127,7 @@ struct dm_pp_single_disp_config {
uint32_t src_height;
uint32_t src_width;
uint32_t v_refresh;
- uint32_t sym_clock; /* HDMI only */
+ uint32_t pixel_clock; /* Pixel clock in KHz (for HDMI only: normalized) */
struct dc_link_settings link_settings; /* DP only */
};

diff --git a/drivers/gpu/drm/amd/include/dm_pp_interface.h b/drivers/gpu/drm/amd/include/dm_pp_interface.h
index acd1cef61b7c..349544504c93 100644
--- a/drivers/gpu/drm/amd/include/dm_pp_interface.h
+++ b/drivers/gpu/drm/amd/include/dm_pp_interface.h
@@ -65,6 +65,7 @@ struct single_display_configuration {
uint32_t view_resolution_cy;
enum amd_pp_display_config_type displayconfigtype;
uint32_t vertical_refresh; /* for active display */
+ uint32_t pixel_clock; /* Pixel clock in KHz (for HDMI only: normalized) */
};

#define MAX_NUM_DISPLAY 32
--
2.53.0