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drm/i915: Force CL2 off in CHV x1 PHY 

We can choose to leave the display PHY CL2 powerdown up to some hardware
signals, or we can force it. The BXT code forces the nonexistent CL2 in
the x1 PHY to power down. Follow suit on CHV. Maybe it can still save
some extra power by disabling some extra logic in CL1, or something.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Deepak S <deepak.s@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
hifive-unleashed-5.1
Ville Syrjälä 2015-07-08 23:45:58 +03:00 committed by Daniel Vetter
parent ee27921824
commit 3e28878635
2 changed files with 10 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -1149,6 +1149,7 @@ enum skl_disp_power_wells {
#define DPIO_SUS_CLK_CONFIG_GATE_CLKREQ (3 << 0)
#define CHV_CMN_DW30 0x8178
#define DPIO_CL2_LDOFUSE_PWRENB (1 << 6)
#define DPIO_LRC_BYPASS (1 << 3)
#define _TXLANE(ch, lane, offset) ((ch ? 0x2400 : 0) + \

9
drivers/gpu/drm/i915/intel_runtime_pm.c
View File

@ -996,6 +996,15 @@ static void chv_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
tmp = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW6_CH1);
tmp |= DPIO_DYNPWRDOWNEN_CH1;
vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW6_CH1, tmp);
} else {
/*
* Force the non-existing CL2 off. BXT does this
* too, so maybe it saves some power even though
* CL2 doesn't exist?
*/
tmp = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
tmp |= DPIO_CL2_LDOFUSE_PWRENB;
vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, tmp);
}
mutex_unlock(&dev_priv->sb_lock);