diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_reg.h | 7 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_pm.c | 8 |
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 1a12d44b9710..04439e888380 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -2973,6 +2973,13 @@ enum skl_disp_power_wells { #define OGAMC0 _MMIO(0x30024) /* + * GEN9 clock gating regs + */ +#define GEN9_CLKGATE_DIS_0 _MMIO(0x46530) +#define PWM2_GATING_DIS (1 << 14) +#define PWM1_GATING_DIS (1 << 13) + +/* * Display engine regs */ diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 96f45d7b3e4b..612a8b462294 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -66,6 +66,14 @@ static void bxt_init_clock_gating(struct drm_device *dev) */ I915_WRITE(GEN8_UCGCTL6, I915_READ(GEN8_UCGCTL6) | GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ); + + /* + * Wa: Backlight PWM may stop in the asserted state, causing backlight + * to stay fully on. + */ + if (IS_BXT_REVID(dev_priv, BXT_REVID_B0, REVID_FOREVER)) + I915_WRITE(GEN9_CLKGATE_DIS_0, I915_READ(GEN9_CLKGATE_DIS_0) | + PWM1_GATING_DIS | PWM2_GATING_DIS); } static void i915_pineview_get_mem_freq(struct drm_device *dev) |