[PATCH v3 05/15] drm/xe/xe3p_lpg: Add MCR steering

Gustavo Sousa
2026-02-06T18:36:36Z

From: Matt Roper <matthew.d.roper@intel.com>

Xe3p_LPG has nearly identical steering to Xe2 and Xe3. The only
DSS/XeCore change from those IPs is an additional range from
0xDE00-0xDE7F that was previously reserved, so we can simply grow one of
the existing ranges in the Xe2 table to include it. Similarly, the
"instance0" table is also almost identical, but gains one additional
PSMI range and requires a separate table.

v2:
- Drop reserved range from MEMPIPE range. (Dnyaneshwar)

Bspec: 75242
Cc: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
drivers/gpu/drm/xe/xe_gt_mcr.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_mcr.c b/drivers/gpu/drm/xe/xe_gt_mcr.c
index 7c1fe9ac120d..da8f6187f893 100644
--- a/drivers/gpu/drm/xe/xe_gt_mcr.c
+++ b/drivers/gpu/drm/xe/xe_gt_mcr.c
@@ -201,7 +201,7 @@ static const struct xe_mmio_range xe2lpg_dss_steering_table[] = {
{ 0x009680, 0x0096FF }, /* DSS */
{ 0x00D800, 0x00D87F }, /* SLICE */
{ 0x00DC00, 0x00DCFF }, /* SLICE */
- { 0x00DE80, 0x00E8FF }, /* DSS (0xE000-0xE0FF reserved) */
+ { 0x00DE00, 0x00E8FF }, /* DSS (0xE000-0xE0FF reserved) */
{ 0x00E980, 0x00E9FF }, /* SLICE */
{ 0x013000, 0x0133FF }, /* DSS (0x13000-0x131FF), SLICE (0x13200-0x133FF) */
{},
@@ -280,6 +280,19 @@ static const struct xe_mmio_range xe3p_xpc_instance0_steering_table[] = {
{},
};

+static const struct xe_mmio_range xe3p_lpg_instance0_steering_table[] = {
+ { 0x004000, 0x004AFF }, /* GAM, rsvd, GAMWKR */
+ { 0x008700, 0x00887F }, /* NODE */
+ { 0x00B000, 0x00B3FF }, /* NODE, L3BANK */
+ { 0x00B500, 0x00B6FF }, /* PSMI */
+ { 0x00C800, 0x00CFFF }, /* GAM */
+ { 0x00D880, 0x00D8FF }, /* NODE */
+ { 0x00DD00, 0x00DD7F }, /* MEMPIPE */
+ { 0x00F000, 0x00FFFF }, /* GAM, GAMWKR */
+ { 0x013400, 0x0135FF }, /* MEMPIPE */
+ {},
+};
+
static void init_steering_l3bank(struct xe_gt *gt)
{
struct xe_device *xe = gt_to_xe(gt);
@@ -533,6 +546,9 @@ void xe_gt_mcr_init_early(struct xe_gt *gt)
gt->steering[INSTANCE0].ranges = xe3p_xpc_instance0_steering_table;
gt->steering[L3BANK].ranges = xelpg_l3bank_steering_table;
gt->steering[NODE].ranges = xe3p_xpc_node_steering_table;
+ } else if (GRAPHICS_VERx100(xe) >= 3510) {
+ gt->steering[DSS].ranges = xe2lpg_dss_steering_table;
+ gt->steering[INSTANCE0].ranges = xe3p_lpg_instance0_steering_table;
} else if (GRAPHICS_VER(xe) >= 20) {
gt->steering[DSS].ranges = xe2lpg_dss_steering_table;
gt->steering[SQIDI_PSMI].ranges = xe2lpg_sqidi_psmi_steering_table;

--
2.52.0