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drm/i915: don't hard code vlv backlight frequency if unset

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Fall back to VBT based backlight modulation frequency if it's not
set. Do not hard code.

This could be a problem if there is no VBT.

Cc: Clint Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Reviewed-by: Clint Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2015-09-04 16:55:15 +03:00 committed by Daniel Vetter
parent aa17cdb4f8
commit 4a999d2531
1 changed files with 0 additions and 13 deletions
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13
drivers/gpu/drm/i915/intel_panel.c
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@ -1532,21 +1532,8 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe p;
u32 ctl, ctl2, val;
for_each_pipe(dev_priv, p) {
u32 cur_val = I915_READ(VLV_BLC_PWM_CTL(p));
/* Skip if the modulation freq is already set */
if (cur_val & ~BACKLIGHT_DUTY_CYCLE_MASK)
continue;
cur_val &= BACKLIGHT_DUTY_CYCLE_MASK;
I915_WRITE(VLV_BLC_PWM_CTL(p), (0xf42 << 16) |
cur_val);
}
if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
return -ENODEV;