drm/i915: s/pm_intr_keep/pm_intrmsk_mbz

"pm_intr_keep" is not conveying the intent that it is bitmask
of interrupts that must be zero(mbz) in GEN6_PMINTRMSK.
Name it "pm_intrmsk_mbz".

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1489199821-6707-2-git-send-email-sagar.a.kamble@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1189,7 +1189,8 @@ static int i915_frequency_info(struct seq_file *m, void *unused)
 		}
 		seq_printf(m, "PM IER=0x%08x IMR=0x%08x ISR=0x%08x IIR=0x%08x, MASK=0x%08x\n",
 			   pm_ier, pm_imr, pm_isr, pm_iir, pm_mask);
-		seq_printf(m, "pm_intr_keep: 0x%08x\n", dev_priv->rps.pm_intr_keep);
+		seq_printf(m, "pm_intrmsk_mbz: 0x%08x\n",
+			   dev_priv->rps.pm_intrmsk_mbz);
 		seq_printf(m, "GT_PERF_STATUS: 0x%08x\n", gt_perf_status);
 		seq_printf(m, "Render p-state ratio: %d\n",
 			   (gt_perf_status & (IS_GEN9(dev_priv) ? 0x1ff00 : 0xff00)) >> 8);

drivers/gpu/drm/i915/i915_drv.h

@@ -1337,7 +1337,7 @@ struct intel_gen6_power_mgmt {
 	u32 pm_iir;
 
 	/* PM interrupt bits that should never be masked */
-	u32 pm_intr_keep;
+	u32 pm_intrmsk_mbz;
 
 	/* Frequencies are stored in potentially platform dependent multiples.
 	 * In other words, *_freq needs to be multiplied by X to be interesting.

drivers/gpu/drm/i915/i915_irq.c

@@ -391,7 +391,7 @@ void gen6_enable_rps_interrupts(struct drm_i915_private *dev_priv)
 
 u32 gen6_sanitize_rps_pm_mask(struct drm_i915_private *dev_priv, u32 mask)
 {
-	return (mask & ~dev_priv->rps.pm_intr_keep);
+	return (mask & ~dev_priv->rps.pm_intrmsk_mbz);
 }
 
 void gen6_disable_rps_interrupts(struct drm_i915_private *dev_priv)
@@ -4270,7 +4270,7 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 	else
 		dev_priv->pm_rps_events = GEN6_PM_RPS_EVENTS;
 
-	dev_priv->rps.pm_intr_keep = 0;
+	dev_priv->rps.pm_intrmsk_mbz = 0;
 
 	/*
 	 * SNB,IVB can while VLV,CHV may hard hang on looping batchbuffer
@@ -4279,33 +4279,33 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 	 * TODO: verify if this can be reproduced on VLV,CHV.
 	 */
 	if (INTEL_INFO(dev_priv)->gen <= 7 && !IS_HASWELL(dev_priv))
-		dev_priv->rps.pm_intr_keep |= GEN6_PM_RP_UP_EI_EXPIRED;
+		dev_priv->rps.pm_intrmsk_mbz |= GEN6_PM_RP_UP_EI_EXPIRED;
 
 	if (INTEL_INFO(dev_priv)->gen >= 8)
-		dev_priv->rps.pm_intr_keep |= GEN8_PMINTR_REDIRECT_TO_GUC;
+		dev_priv->rps.pm_intrmsk_mbz |= GEN8_PMINTR_REDIRECT_TO_GUC;
 
 	/*
 	 * The REDIRECT_TO_GUC bit of the PMINTRMSK register directs all
 	 * (unmasked) PM interrupts to the GuC. All other bits of this
 	 * register *disable* generation of a specific interrupt.
 	 *
-	 * 'pm_intr_keep' indicates bits that are NOT to be set when
+	 * 'pm_intrmsk_mbz' indicates bits that are NOT to be set when
 	 * writing to the PM interrupt mask register, i.e. interrupts
 	 * that must not be disabled.
 	 *
 	 * If the GuC is handling these interrupts, then we must not let
 	 * the PM code disable ANY interrupt that the GuC is expecting.
 	 * So for each ENABLED (0) bit in this register, we must SET the
-	 * bit in pm_intr_keep so that it's left enabled for the GuC.
+	 * bit in pm_intrmsk_mbz so that it's left enabled for the GuC.
 	 * GuC needs ARAT expired interrupt unmasked hence it is set in
-	 * pm_intr_keep.
+	 * pm_intrmsk_mbz.
 	 *
-	 * Here we CLEAR REDIRECT_TO_GUC bit in pm_intr_keep, which will
+	 * Here we CLEAR REDIRECT_TO_GUC bit in pm_intrmsk_mbz, which will
 	 * result in the register bit being left SET!
 	 */
 	if (HAS_GUC_SCHED(dev_priv)) {
-		dev_priv->rps.pm_intr_keep |= ARAT_EXPIRED_INTRMSK;
-		dev_priv->rps.pm_intr_keep &= ~GEN8_PMINTR_REDIRECT_TO_GUC;
+		dev_priv->rps.pm_intrmsk_mbz |= ARAT_EXPIRED_INTRMSK;
+		dev_priv->rps.pm_intrmsk_mbz &= ~GEN8_PMINTR_REDIRECT_TO_GUC;
 	}
 
 	if (IS_GEN2(dev_priv)) {