[PATCH 3/3] drm/i915/bxt: Use the bypass frequency if there are no active pipes.

Maarten Lankhorst
2015-10-27T13:26:39Z

Now that pixel clock is set to 0 when there are no active pipes it's
easy to set the bypass frequency for this case.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e9a94ddcba73..ddac097cd08a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5925,7 +5925,6 @@ static int broxton_calc_cdclk(struct drm_i915_private *dev_priv,
/*
* FIXME:
* - remove the guardband, it's not needed on BXT
- * - set 19.2MHz bypass frequency if there are no active pipes
*/
if (max_pixclk > 576000*9/10)
return 624000;
@@ -5935,8 +5934,10 @@ static int broxton_calc_cdclk(struct drm_i915_private *dev_priv,
return 384000;
else if (max_pixclk > 144000*9/10)
return 288000;
- else
+ else if (max_pixclk)
return 144000;
+ else
+ return 19200;
}

/* Compute the max pixel clock for new configuration. Uses atomic state if
--
2.1.0