From: Duncan Laurie dlaurie@chromium.org
We had been using a DMI table workaround to select the right frequency for devices, but this is fragile and must be updated with every new platform.
Instead the default case when VBT is missing is changed to use 120MHz clock for LVDS SSC for these generations.
The docs for 2010-Core, SandyBridge, and IvyBridge all indicate that the reference frequency for LVDS is 120MHz:
"2010 Core" http://intellinuxgraphics.org/IHD_OS_Vol3_Part3r2.pdf page 38 Reference Frequency: 120MHz for CRT and LVDS. 100MHz for the FDI.
"2011 SandyBridge" http://intellinuxgraphics.org/documentation/SNB/IHD_OS_Vol3_Part3.pdf page 33 Reference Frequency: 120MHz for CRT, HDMI, LVDS. 100MHz for the FDI.
"2012 IvyBridge" http://intellinuxgraphics.org/documentation/IVB/IHD_OS_Vol3_Part4.pdf page 27 Reference Frequency: 120 MHz for CRT, HDMI, LVDS, 100MHz for the FDI.
Signed-off-by: Duncan Laurie dlaurie@chromium.org [olof: Fixup for recent base, switched from if/else to single call] Signed-off-by: Olof Johansson olof@lixom.net ---
Daniel,
This applies on top of -next, which I'm presuming is close to your for-3.13 base right now. It'd be good to see this go in since it's needed to boot on Chromebooks (with developer mode off), and is thus blocking testing next/mainline on a regular basis here.
Thanks!
-Olof
drivers/gpu/drm/i915/intel_bios.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c index 6dd622d733b9..e4fba39631a5 100644 --- a/drivers/gpu/drm/i915/intel_bios.c +++ b/drivers/gpu/drm/i915/intel_bios.c @@ -790,7 +790,12 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
/* Default to using SSC */ dev_priv->vbt.lvds_use_ssc = 1; - dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev, 1); + /* + * Core/SandyBridge/IvyBridge use alternative (120MHz) reference + * clock for LVDS. + */ + dev_priv->vbt.lvds_ssc_freq = intel_bios_ssc_frequency(dev, + !HAS_PCH_SPLIT(dev)); DRM_DEBUG_KMS("Set default to SSC at %dMHz\n", dev_priv->vbt.lvds_ssc_freq);
for (port = PORT_A; port < I915_MAX_PORTS; port++) {