diff options
| author |   Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-01-28 12:37:50 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2022-02-01 11:33:23 +0200 |
| commit | f0d4ce59f4d48622044933054a0e0cefa91ba15e (patch) | |
| tree | b0846093dd716923731bdc3d29082ea38bdf196f /drivers | |
| parent | drm/i915: Extract {i9xx,ilk}_configure_cpu_transcoder() (diff) | |
| download | linux-dev-f0d4ce59f4d48622044933054a0e0cefa91ba15e.tar.xz linux-dev-f0d4ce59f4d48622044933054a0e0cefa91ba15e.zip | |
drm/i915: Disable DRRS on IVB/HSW port != A
Currently we allow DRRS on IVB PCH ports, but we're missing a
few programming steps meaning it is guaranteed to not work.
And on HSW DRRS is not supported on anything but port A ever
as only transcoder EDP has the M2/N2 registers (though I'm
not sure if HSW ever has eDP on any other port).
Starting from BDW all transcoders have the dynamically
reprogrammable M/N registers so DRRS could work on any
port.
Stop initializing DRRS on ports where it cannot possibly work.
Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220128103757.22461-11-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_drrs.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/display/intel_drrs.c b/drivers/gpu/drm/i915/display/intel_drrs.c index 53f014b4436b..9f673255578e 100644 --- a/drivers/gpu/drm/i915/display/intel_drrs.c +++ b/drivers/gpu/drm/i915/display/intel_drrs.c @@ -413,6 +413,7 @@ intel_drrs_init(struct intel_connector *connector, struct drm_display_mode *fixed_mode) { struct drm_i915_private *dev_priv = to_i915(connector->base.dev); + struct intel_encoder *encoder = connector->encoder; struct drm_display_mode *downclock_mode = NULL; INIT_DELAYED_WORK(&dev_priv->drrs.work, intel_drrs_downclock_work); @@ -424,6 +425,13 @@ intel_drrs_init(struct intel_connector *connector, return NULL; } + if ((DISPLAY_VER(dev_priv) < 8 && !HAS_GMCH(dev_priv)) && + encoder->port != PORT_A) { + drm_dbg_kms(&dev_priv->drm, + "DRRS only supported on eDP port A\n"); + return NULL; + } + if (dev_priv->vbt.drrs_type != SEAMLESS_DRRS_SUPPORT) { drm_dbg_kms(&dev_priv->drm, "VBT doesn't support DRRS\n"); return NULL; |