drm/i915/rps: Prefer REG_FIELD_GET in intel_rps_get_cagf

Instead of masks/shifts settle on REG_FIELD_GET as the standard way to
extract reg fields. This allows future patches touching this code to also
consistently use REG_FIELD_GET and friends.

Suggested-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221114123348.3474216-2-badal.nilawar@intel.com

Author: ashutoshx

drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c

@@ -307,7 +307,7 @@ void intel_gt_pm_frequency_dump(struct intel_gt *gt, struct drm_printer *p)
 		drm_printf(p, "Current VID: %d\n", (rgvstat & MEMSTAT_VID_MASK) >>
 			   MEMSTAT_VID_SHIFT);
 		drm_printf(p, "Current P-state: %d\n",
-			   (rgvstat & MEMSTAT_PSTATE_MASK) >> MEMSTAT_PSTATE_SHIFT);
+			   REG_FIELD_GET(MEMSTAT_PSTATE_MASK, rgvstat));
 	} else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
 		u32 rpmodectl, freq_sts;
 

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -799,12 +799,9 @@
 #define GEN6_RP_DOWN_TIMEOUT			_MMIO(0xa010)
 #define GEN6_RP_INTERRUPT_LIMITS		_MMIO(0xa014)
 #define GEN6_RPSTAT1				_MMIO(0xa01c)
-#define   GEN6_CAGF_SHIFT			8
-#define   HSW_CAGF_SHIFT			7
-#define   GEN9_CAGF_SHIFT			23
-#define   GEN6_CAGF_MASK			(0x7f << GEN6_CAGF_SHIFT)
-#define   HSW_CAGF_MASK				(0x7f << HSW_CAGF_SHIFT)
-#define   GEN9_CAGF_MASK			(0x1ff << GEN9_CAGF_SHIFT)
+#define   GEN6_CAGF_MASK			REG_GENMASK(14, 8)
+#define   HSW_CAGF_MASK				REG_GENMASK(13, 7)
+#define   GEN9_CAGF_MASK			REG_GENMASK(31, 23)
 #define GEN6_RP_CONTROL				_MMIO(0xa024)
 #define   GEN6_RP_MEDIA_TURBO			(1 << 11)
 #define   GEN6_RP_MEDIA_MODE_MASK		(3 << 9)
@@ -1376,8 +1373,7 @@
 #define MEMSTAT_ILK				_MMIO(0x111f8)
 #define   MEMSTAT_VID_MASK			0x7f00
 #define   MEMSTAT_VID_SHIFT			8
-#define   MEMSTAT_PSTATE_MASK			0x00f8
-#define   MEMSTAT_PSTATE_SHIFT			3
+#define   MEMSTAT_PSTATE_MASK			REG_GENMASK(7, 3)
 #define   MEMSTAT_MON_ACTV			(1 << 2)
 #define   MEMSTAT_SRC_CTL_MASK			0x0003
 #define   MEMSTAT_SRC_CTL_CORE			0

drivers/gpu/drm/i915/gt/intel_rps.c

@@ -2080,16 +2080,15 @@ u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat)
 	u32 cagf;
 
 	if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
-		cagf = (rpstat >> 8) & 0xff;
+		cagf = REG_FIELD_GET(RPE_MASK, rpstat);
 	else if (GRAPHICS_VER(i915) >= 9)
-		cagf = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
+		cagf = REG_FIELD_GET(GEN9_CAGF_MASK, rpstat);
 	else if (IS_HASWELL(i915) || IS_BROADWELL(i915))
-		cagf = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
+		cagf = REG_FIELD_GET(HSW_CAGF_MASK, rpstat);
 	else if (GRAPHICS_VER(i915) >= 6)
-		cagf = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
+		cagf = REG_FIELD_GET(GEN6_CAGF_MASK, rpstat);
 	else
-		cagf = gen5_invert_freq(rps, (rpstat & MEMSTAT_PSTATE_MASK) >>
-					MEMSTAT_PSTATE_SHIFT);
+		cagf = gen5_invert_freq(rps, REG_FIELD_GET(MEMSTAT_PSTATE_MASK, rpstat));
 
 	return cagf;
 }