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drm/i915: Steal power sequencer in vlv_power_sequencer_pipe()

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In case we fumble something and end up picking an already used power
seqeuencer in vlv_power_sequencer_pipe() at least try to steal it
gracefully. In theory this should never happen though.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ville Syrjälä 2014-10-16 21:29:59 +03:00 committed by Daniel Vetter
parent ac3c12e4e5
commit a8c3344e06
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/i915/intel_dp.c
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@ -114,6 +114,8 @@ static void intel_dp_link_down(struct intel_dp *intel_dp);
static bool edp_panel_vdd_on(struct intel_dp *intel_dp);
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp);
static void vlv_steal_power_sequencer(struct drm_device *dev,
enum pipe pipe);
int
intel_dp_max_link_bw(struct intel_dp *intel_dp)
@ -375,9 +377,13 @@ vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_encoder *encoder;
unsigned int pipes = (1 << PIPE_A) | (1 << PIPE_B);
enum pipe pipe;
lockdep_assert_held(&dev_priv->pps_mutex);
/* We should never land here with regular DP ports */
WARN_ON(!is_edp(intel_dp));
if (intel_dp->pps_pipe != INVALID_PIPE)
return intel_dp->pps_pipe;
@ -403,9 +409,12 @@ vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
* are two power sequencers and up to two eDP ports.
*/
if (WARN_ON(pipes == 0))
return PIPE_A;
pipe = PIPE_A;
else
pipe = ffs(pipes) - 1;
intel_dp->pps_pipe = ffs(pipes) - 1;
vlv_steal_power_sequencer(dev, pipe);
intel_dp->pps_pipe = pipe;
DRM_DEBUG_KMS("picked pipe %c power sequencer for port %c\n",
pipe_name(intel_dp->pps_pipe),