diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_i2c.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c index a8c08994f505..ef9f91a0b0c9 100644 --- a/drivers/gpu/drm/i915/intel_i2c.c +++ b/drivers/gpu/drm/i915/intel_i2c.c @@ -142,6 +142,32 @@ static void pnv_gmbus_clock_gating(struct drm_i915_private *dev_priv, I915_WRITE(DSPCLK_GATE_D, val); } +static void pch_gmbus_clock_gating(struct drm_i915_private *dev_priv, + bool enable) +{ + u32 val; + + val = I915_READ(SOUTH_DSPCLK_GATE_D); + if (!enable) + val |= PCH_GMBUSUNIT_CLOCK_GATE_DISABLE; + else + val &= ~PCH_GMBUSUNIT_CLOCK_GATE_DISABLE; + I915_WRITE(SOUTH_DSPCLK_GATE_D, val); +} + +static void bxt_gmbus_clock_gating(struct drm_i915_private *dev_priv, + bool enable) +{ + u32 val; + + val = I915_READ(GEN9_CLKGATE_DIS_4); + if (!enable) + val |= BXT_GMBUS_GATING_DIS; + else + val &= ~BXT_GMBUS_GATING_DIS; + I915_WRITE(GEN9_CLKGATE_DIS_4, val); +} + static u32 get_reserved(struct intel_gmbus *bus) { struct drm_i915_private *dev_priv = bus->dev_priv; @@ -484,6 +510,13 @@ do_gmbus_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) int i = 0, inc, try = 0; int ret = 0; + /* Display WA #0868: skl,bxt,kbl,cfl,glk,cnl */ + if (IS_GEN9_LP(dev_priv)) + bxt_gmbus_clock_gating(dev_priv, false); + else if (HAS_PCH_SPT(dev_priv) || + HAS_PCH_KBP(dev_priv) || HAS_PCH_CNP(dev_priv)) + pch_gmbus_clock_gating(dev_priv, false); + retry: I915_WRITE_FW(GMBUS0, bus->reg0); @@ -585,6 +618,13 @@ timeout: ret = -EAGAIN; out: + /* Display WA #0868: skl,bxt,kbl,cfl,glk,cnl */ + if (IS_GEN9_LP(dev_priv)) + bxt_gmbus_clock_gating(dev_priv, true); + else if (HAS_PCH_SPT(dev_priv) || + HAS_PCH_KBP(dev_priv) || HAS_PCH_CNP(dev_priv)) + pch_gmbus_clock_gating(dev_priv, true); + return ret; } |
