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drm/i915: Read out hrawclk from CCK on vlv/chv 

Currently we assume that hrawclk is 200MHz on VLV/CHV. That should
be true always, but just to avoid such asumptions we can read out the
actual frequency from CCK.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456932138-14004-5-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
This commit is contained in:
Ville Syrjälä 2016-03-02 17:22:16 +02:00
parent 193709c1c4
commit 35d38d1f17
2 changed files with 3 additions and 1 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -786,6 +786,7 @@ enum skl_disp_power_wells {
#define DSI_PLL_M1_DIV_MASK (0x1ff << 0)
#define CCK_CZ_CLOCK_CONTROL 0x62
#define CCK_DISPLAY_CLOCK_CONTROL 0x6b
#define CCK_DISPLAY_REF_CLOCK_CONTROL 0x6c
#define CCK_TRUNK_FORCE_ON (1 << 17)
#define CCK_TRUNK_FORCE_OFF (1 << 16)
#define CCK_FREQUENCY_STATUS (0x1f << 8)

3
drivers/gpu/drm/i915/intel_display.c
View File

@ -178,7 +178,8 @@ intel_pch_rawclk(struct drm_i915_private *dev_priv)
static int
intel_vlv_hrawclk(struct drm_i915_private *dev_priv)
{
return 200000;
return vlv_get_cck_clock_hpll(dev_priv, "hrawclk",
CCK_DISPLAY_REF_CLOCK_CONTROL);
}
static int