From: Simon Que <sque@xxxxxxxxxxxx> When initializing VBT default values, the alternate BIOS SSC frequency is selected. This patch allows the non-alternate frequency to be selected as a default, for specified systems. There is a DMI match list for systems that are to use the non-alternate frequency. Currently, only Lumpy is on the list. BUG=chrome-os-partner:5525 TEST=Run on Lumpy with dev switch off. The display should be working, even if the backlight is not -- something should be visible. Change-Id: I6c5c57ab38cfb21731a6d56b143c7906b8c85360 Signed-off-by: Simon Que <sque@xxxxxxxxxxxx> Reviewed-on: https://gerrit.chromium.org/gerrit/11339 Reviewed-by: Bryan Freed <bfreed@xxxxxxxxxxxx> [marcheu: fixups for 3.8] Signed-off-by: Stéphane Marchesin <marcheu@xxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_bios.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 55ffba1..b6a8b69 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -631,6 +631,17 @@ parse_device_mapping(struct drm_i915_private *dev_priv, return; } +static const struct dmi_system_id lvds_do_not_use_alternate_frequency[] = { + { + .callback = NULL, + .ident = "Lumpy", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "Lumpy"), + } + }, + { } +}; + static void init_vbt_defaults(struct drm_i915_private *dev_priv) { @@ -651,7 +662,10 @@ init_vbt_defaults(struct drm_i915_private *dev_priv) /* Default to using SSC */ dev_priv->lvds_use_ssc = 1; - dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1); + if (dmi_check_system(lvds_do_not_use_alternate_frequency)) + dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 0); + else + dev_priv->lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1); DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->lvds_ssc_freq); } -- 1.8.3.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
