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drm/i915: Check error return when converting pipe to connector

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An error from intel_get_pipe_from_connector() would mean a bug somewhere
else, but we still should check for it to prevent some other more
obscure bug later.

v2:
- Fall back to a reasonable default instead of bailing out in case of
  error. (Jani)
v3:
- Fix s/PIPE_INVALID/INVALID_PIPE/ typo. (Jani)
v4:
- Fix bogus bracing around WARN() condition. (Ville)

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1494408113-379-5-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2017-05-10 12:21:51 +03:00
parent 4519290aec
commit 0290cf3f9f
1 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/gpu/drm/i915/intel_panel.c
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@ -888,10 +888,14 @@ static void pch_enable_backlight(struct intel_connector *connector)
struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
enum transcoder cpu_transcoder =
intel_pipe_to_cpu_transcoder(dev_priv, pipe);
enum transcoder cpu_transcoder;
u32 cpu_ctl2, pch_ctl1, pch_ctl2;
if (!WARN_ON_ONCE(pipe == INVALID_PIPE))
cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv, pipe);
else
cpu_transcoder = TRANSCODER_EDP;
cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("cpu backlight already enabled\n");
@ -973,6 +977,9 @@ static void i965_enable_backlight(struct intel_connector *connector)
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 ctl, ctl2, freq;
if (WARN_ON_ONCE(pipe == INVALID_PIPE))
pipe = PIPE_A;
ctl2 = I915_READ(BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
DRM_DEBUG_KMS("backlight already enabled\n");
@ -1037,6 +1044,9 @@ static void bxt_enable_backlight(struct intel_connector *connector)
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 pwm_ctl, val;
if (WARN_ON_ONCE(pipe == INVALID_PIPE))
pipe = PIPE_A;
/* Controller 1 uses the utility pin. */
if (panel->backlight.controller == 1) {
val = I915_READ(UTIL_PIN_CTL);
@ -1093,6 +1103,7 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
if (!panel->backlight.present)
return;
if (!WARN_ON_ONCE(pipe == INVALID_PIPE))
DRM_DEBUG_KMS("pipe %c\n", pipe_name(pipe));
mutex_lock(&dev_priv->backlight_lock);