Boot params quirks_set and quirks_mask allow the user to enable or
inhibit any dmi-matched quirks, overriding the dmi match table. Examples:
i915.quirks_set=0x2 - enables QUIRK_LVDS_SSC_DISABLE
i915.quirks_set=0x8 - enables QUIRK_NO_PCH_PWM_ENABLE
i915.quirks_mask=0x8 - disables QUIRK_NO_PCH_PWM_ENABLE
i915.quirks_mask=0xFF - disables all quirks
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/gpu/drm/i915/intel_display.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d88057e..a6af11c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10028,8 +10028,19 @@ static struct intel_quirk intel_quirks[] = {
{ 0x0166, 0x1028, 0x058b, quirk_no_pcm_pwm_enable },
};
+unsigned long i915_quirks_set __read_mostly = 0;
+module_param_named(quirks_set, i915_quirks_set, ulong, 0600);
+MODULE_PARM_DESC(quirks_set,
+ "Enable specified quirks bits.");
+
+unsigned long i915_quirks_mask __read_mostly = 0;
+module_param_named(quirks_mask, i915_quirks_mask, ulong, 0600);
+MODULE_PARM_DESC(quirks_mask,
+ "Disable specified quirks bits (override dmi match).");
+
static void intel_init_quirks(struct drm_device *dev)
{
+ struct drm_i915_private *dev_priv = dev->dev_private;
struct pci_dev *d = dev->pdev;
int i;
@@ -10047,6 +10058,10 @@ static void intel_init_quirks(struct drm_device *dev)
if (dmi_check_system(*intel_dmi_quirks[i].dmi_id_list) != 0)
intel_dmi_quirks[i].hook(dev);
}
+
+ /* handle user-specified quirks overrides */
+ dev_priv->quirks |= i915_quirks_set;
+ dev_priv->quirks &= ~i915_quirks_mask;
}
/* Disable the VGA plane that we never use */
--
1.8.1.2
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