Don't touch other bits. My bad.
I haven't seen any case where those other bits appeard to be
set before we touch it, but it is safe to avoid touching
other bits we weren't told to touch.
Fixes: 0a46ddd57c9e ("drm/i915/cnp: Wa 1181: Fix Backlight issue")
Cc: Dhinakaran Pandiyan <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
---
drivers/gpu/drm/i915/intel_pm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index fa9055a4f790..09ecc8e3b2d3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8370,7 +8370,8 @@ static void cnp_init_clock_gating(struct drm_i915_private
*dev_priv)
return;
/* Wa #1181 */
- I915_WRITE(SOUTH_DSPCLK_GATE_D, CNP_PWM_CGE_GATING_DISABLE);
+ I915_WRITE(SOUTH_DSPCLK_GATE_D, I915_READ(SOUTH_DSPCLK_GATE_D) |
+ CNP_PWM_CGE_GATING_DISABLE);
}
static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
--
2.13.2
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