From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	patches@lists.linux.dev,
	=?UTF-8?q?Timur=20Krist=C3=B3f?= <timur.kristof@gmail.com>,
	Alex Deucher <alexander.deucher@amd.com>,
	Rosen Penev <rosenp@gmail.com>
Subject: [PATCH 6.1 461/481] drm/amd/display: Add pixel_clock to amd_pp_display_configuration
Date: Mon, 23 Mar 2026 14:47:23 +0100
Message-ID: <20260323134536.450042148@linuxfoundation.org>
In-Reply-To: <20260323134525.256603107@linuxfoundation.org>
References: <20260323134525.256603107@linuxfoundation.org>
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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit b515dcb0dc4e85d8254f5459cfb32fce88dacbfb ]

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>
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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(-)

--- 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);
--- 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;
--- 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 */
 };
 
--- a/drivers/gpu/drm/amd/include/dm_pp_interface.h
+++ b/drivers/gpu/drm/amd/include/dm_pp_interface.h
@@ -66,6 +66,7 @@ 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