drm/xe/bmg: Program an additional discrete-specific PAT setting

Discrete Xe2 platforms require programming of one additional row of PAT
settings which controls the access characteristics for PPGTT and LMTT
page tables.  Integrated GPUs do not need this programming and will
leave the register at its hardware default value.

Bspec:  71582
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240408170545.3769566-6-balasubramani.vivekanandan@intel.com

drivers/gpu/drm/xe/xe_pat.c

@@ -142,6 +142,7 @@ static const struct xe_pat_table_entry xe2_pat_table[] = {
 
 /* Special PAT values programmed outside the main table */
 static const struct xe_pat_table_entry xe2_pat_ats = XE2_PAT( 0, 0, 0, 0, 3, 3 );
+static const struct xe_pat_table_entry xe2_pat_pta = XE2_PAT( 0, 0, 0, 0, 3, 0 );
 
 u16 xe_pat_index_get_coh_mode(struct xe_device *xe, u16 pat_index)
 {
@@ -302,6 +303,9 @@ static void xe2lpg_program_pat(struct xe_gt *gt, const struct xe_pat_table_entry
 {
 	program_pat_mcr(gt, table, n_entries);
 	xe_gt_mcr_multicast_write(gt, XE_REG_MCR(_PAT_ATS), xe2_pat_ats.value);
+
+	if (IS_DGFX(gt_to_xe(gt)))
+		xe_gt_mcr_multicast_write(gt, XE_REG_MCR(_PAT_PTA), xe2_pat_pta.value);
 }
 
 static void xe2lpm_program_pat(struct xe_gt *gt, const struct xe_pat_table_entry table[],
@@ -309,6 +313,9 @@ static void xe2lpm_program_pat(struct xe_gt *gt, const struct xe_pat_table_entry
 {
 	program_pat(gt, table, n_entries);
 	xe_mmio_write32(gt, XE_REG(_PAT_ATS), xe2_pat_ats.value);
+
+	if (IS_DGFX(gt_to_xe(gt)))
+		xe_mmio_write32(gt, XE_REG(_PAT_PTA), xe2_pat_pta.value);
 }
 
 static void xe2_dump(struct xe_gt *gt, struct drm_printer *p)