Single channel LVDS maxes out at 112 MHz. All 17" models with i915
graphics had a resolution of 1920x1200 (193 MHz), necessitating dual
channel LVDS. The 15" pre-retina models had either 1440x900 (106 MHz)
or 1680x1050 (119 MHz), both versions used dual channel LVDS even
though the smaller one would have fit into a single channel.
v2: Assume dual channel LVDS if the pixel clock necessitates it,
eliminating the need to hardcode 17" models, suggested by Jani Nikula.
v3: Fix typo, thanks Joonas Lahtinen.
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Tested-by: Lukas Wunner <lukas@xxxxxxxxx>
Acked-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/i915/intel_lvds.c | 26 ++++++++++++++++++++++++--
1 file changed, 24 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 071b96d..417ccab 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -812,12 +812,28 @@ static int intel_dual_link_lvds_callback(const struct dmi_system_id *id)
static const struct dmi_system_id intel_dual_link_lvds[] = {
{
.callback = intel_dual_link_lvds_callback,
- .ident = "Apple MacBook Pro (Core i5/i7 Series)",
+ .ident = "Apple MacBook Pro 15\" (2010)",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro6,2"),
+ },
+ },
+ {
+ .callback = intel_dual_link_lvds_callback,
+ .ident = "Apple MacBook Pro 15\" (2011)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro8,2"),
},
},
+ {
+ .callback = intel_dual_link_lvds_callback,
+ .ident = "Apple MacBook Pro 15\" (2012)",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro9,1"),
+ },
+ },
{ } /* terminating entry */
};
@@ -847,6 +863,11 @@ static bool compute_is_dual_link_lvds(struct intel_lvds_encoder *lvds_encoder)
if (i915.lvds_channel_mode > 0)
return i915.lvds_channel_mode == 2;
+ /* single channel LVDS is limited to 112 MHz */
+ if (lvds_encoder->attached_connector->base.panel.fixed_mode->clock
+ > 112999)
+ return true;
+
if (dmi_check_system(intel_dual_link_lvds))
return true;
@@ -1104,6 +1125,8 @@ void intel_lvds_init(struct drm_device *dev)
out:
mutex_unlock(&dev->mode_config.mutex);
+ intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
+
lvds_encoder->is_dual_link = compute_is_dual_link_lvds(lvds_encoder);
DRM_DEBUG_KMS("detected %s-link lvds configuration\n",
lvds_encoder->is_dual_link ? "dual" : "single");
@@ -1118,7 +1141,6 @@ out:
}
drm_connector_register(connector);
- intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
intel_panel_setup_backlight(connector, INVALID_PIPE);
return;
--
1.8.5.2 (Apple Git-48)
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