drm/xe: Enable media sampler power gating

[ Upstream commit 1852d27 ]

Where applicable, enable media sampler power gating. Also, add
it to the powergate_info debugfs.

v2: Remove the sampler powergate status since it is cleared quickly anyway.
v3: Use vcs mask (Rodrigo) and fix the version check for media
v4: Remove extra spaces
v5: Media samplers are independent of vcs mask,
    use Media version 1255 (Matt Roper)

Fixes: 38e8c41 ("drm/xe: Enable Coarse Power Gating")
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Link: https://lore.kernel.org/r/20251010011047.2047584-1-vinay.belgaumkar@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 4cbc086)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: vsbelgaum

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -342,6 +342,7 @@
 #define POWERGATE_ENABLE			XE_REG(0xa210)
 #define   RENDER_POWERGATE_ENABLE		REG_BIT(0)
 #define   MEDIA_POWERGATE_ENABLE		REG_BIT(1)
+#define   MEDIA_SAMPLERS_POWERGATE_ENABLE	REG_BIT(2)
 #define   VDN_HCP_POWERGATE_ENABLE(n)		REG_BIT(3 + 2 * (n))
 #define   VDN_MFXVDENC_POWERGATE_ENABLE(n)	REG_BIT(4 + 2 * (n))
 

drivers/gpu/drm/xe/xe_gt_idle.c

@@ -124,6 +124,9 @@ void xe_gt_idle_enable_pg(struct xe_gt *gt)
 	if (xe_gt_is_main_type(gt))
 		gtidle->powergate_enable |= RENDER_POWERGATE_ENABLE;
 
+	if (MEDIA_VERx100(xe) >= 1100 && MEDIA_VERx100(xe) < 1255)
+		gtidle->powergate_enable |= MEDIA_SAMPLERS_POWERGATE_ENABLE;
+
 	if (xe->info.platform != XE_DG1) {
 		for (i = XE_HW_ENGINE_VCS0, j = 0; i <= XE_HW_ENGINE_VCS7; ++i, ++j) {
 			if ((gt->info.engine_mask & BIT(i)))
@@ -246,6 +249,11 @@ int xe_gt_idle_pg_print(struct xe_gt *gt, struct drm_printer *p)
 				drm_printf(p, "Media Slice%d Power Gate Status: %s\n", n,
 					   str_up_down(pg_status & media_slices[n].status_bit));
 	}
+
+	if (MEDIA_VERx100(xe) >= 1100 && MEDIA_VERx100(xe) < 1255)
+		drm_printf(p, "Media Samplers Power Gating Enabled: %s\n",
+			   str_yes_no(pg_enabled & MEDIA_SAMPLERS_POWERGATE_ENABLE));
+
 	return 0;
 }