6.6-stable review patch. If anyone has any objections, please let me know.
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From: Timur Kristóf timur.kristof@gmail.com
[ Upstream commit 585b2f685c56c5095cc22c7202bf74d8e9a73cdd ]
Update the legacy (non-DC) display code to respect the maximum pixel clock for HDMI and DVI-D. Reject modes that would require a higher pixel clock than can be supported.
Also update the maximum supported HDMI clock value depending on the ASIC type.
For reference, see the DC code: check max_hdmi_pixel_clock in dce*_resource.c
v2: Fix maximum clocks for DVI-D and DVI/HDMI adapters.
Reviewed-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Timur Kristóf timur.kristof@gmail.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../gpu/drm/amd/amdgpu/amdgpu_connectors.c | 57 ++++++++++++++----- 1 file changed, 44 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c index d34037b85cf85..eb20018b61e47 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c @@ -1205,29 +1205,60 @@ static void amdgpu_connector_dvi_force(struct drm_connector *connector) amdgpu_connector->use_digital = true; }
+/** + * Returns the maximum supported HDMI (TMDS) pixel clock in KHz. + */ +static int amdgpu_max_hdmi_pixel_clock(const struct amdgpu_device *adev) +{ + if (adev->asic_type >= CHIP_POLARIS10) + return 600000; + else if (adev->asic_type >= CHIP_TONGA) + return 300000; + else + return 297000; +} + +/** + * Validates the given display mode on DVI and HDMI connectors, + * including analog signals on DVI-I. + */ static enum drm_mode_status amdgpu_connector_dvi_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { struct drm_device *dev = connector->dev; struct amdgpu_device *adev = drm_to_adev(dev); struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector); + const int max_hdmi_pixel_clock = amdgpu_max_hdmi_pixel_clock(adev); + const int max_dvi_single_link_pixel_clock = 165000; + int max_digital_pixel_clock_khz;
/* XXX check mode bandwidth */
- if (amdgpu_connector->use_digital && (mode->clock > 165000)) { - if ((amdgpu_connector->connector_object_id == CONNECTOR_OBJECT_ID_DUAL_LINK_DVI_I) || - (amdgpu_connector->connector_object_id == CONNECTOR_OBJECT_ID_DUAL_LINK_DVI_D) || - (amdgpu_connector->connector_object_id == CONNECTOR_OBJECT_ID_HDMI_TYPE_B)) { - return MODE_OK; - } else if (connector->display_info.is_hdmi) { - /* HDMI 1.3+ supports max clock of 340 Mhz */ - if (mode->clock > 340000) - return MODE_CLOCK_HIGH; - else - return MODE_OK; - } else { - return MODE_CLOCK_HIGH; + if (amdgpu_connector->use_digital) { + switch (amdgpu_connector->connector_object_id) { + case CONNECTOR_OBJECT_ID_HDMI_TYPE_A: + max_digital_pixel_clock_khz = max_hdmi_pixel_clock; + break; + case CONNECTOR_OBJECT_ID_SINGLE_LINK_DVI_I: + case CONNECTOR_OBJECT_ID_SINGLE_LINK_DVI_D: + max_digital_pixel_clock_khz = max_dvi_single_link_pixel_clock; + break; + case CONNECTOR_OBJECT_ID_DUAL_LINK_DVI_I: + case CONNECTOR_OBJECT_ID_DUAL_LINK_DVI_D: + case CONNECTOR_OBJECT_ID_HDMI_TYPE_B: + max_digital_pixel_clock_khz = max_dvi_single_link_pixel_clock * 2; + break; } + + /* When the display EDID claims that it's an HDMI display, + * we use the HDMI encoder mode of the display HW, + * so we should verify against the max HDMI clock here. + */ + if (connector->display_info.is_hdmi) + max_digital_pixel_clock_khz = max_hdmi_pixel_clock; + + if (mode->clock > max_digital_pixel_clock_khz) + return MODE_CLOCK_HIGH; }
/* check against the max pixel clock */