[PATCH 2/5] drm/i915: HSW_BLC_PWM2_CTL doesn't exist on BDW

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

So don't write it, otherwise we will trigger unclaimed register
errors.

Testcase: igt/pm_rpm/rte
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index c12a5da..14505a1 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7345,8 +7345,9 @@ static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
 	WARN(I915_READ(PCH_PP_STATUS) & PP_ON, "Panel power on\n");
 	WARN(I915_READ(BLC_PWM_CPU_CTL2) & BLM_PWM_ENABLE,
 	     "CPU PWM1 enabled\n");
-	WARN(I915_READ(HSW_BLC_PWM2_CTL) & BLM_PWM_ENABLE,
-	     "CPU PWM2 enabled\n");
+	if (IS_HASWELL(dev))
+		WARN(I915_READ(HSW_BLC_PWM2_CTL) & BLM_PWM_ENABLE,
+		     "CPU PWM2 enabled\n");
 	WARN(I915_READ(BLC_PWM_PCH_CTL1) & BLM_PCH_PWM_ENABLE,
 	     "PCH PWM1 enabled\n");
 	WARN(I915_READ(UTIL_PIN_CTL) & UTIL_PIN_ENABLE,
-- 
2.0.0