[Intel-gfx] [PATCH v2 03/21] drm/i915/mtl: MMIO range is now 4MB

Radhakrishna Sripada
2022-08-18T23:44:30Z

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

Previously only dgfx platforms had a 4MB MMIO range, but starting with
MTL we now use the larger range for all platforms.

Bspec: 63834, 63830
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
---
drivers/gpu/drm/i915/intel_uncore.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index a852c471d1b3..e0a8a8cb2052 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -2232,14 +2232,15 @@ int intel_uncore_setup_mmio(struct intel_uncore *uncore, phys_addr_t phys_addr)
* clobbering the GTT which we want ioremap_wc instead. Fortunately,
* the register BAR remains the same size for all the earlier
* generations up to Ironlake.
- * For dgfx chips register range is expanded to 4MB.
+ * For dgfx chips register range is expanded to 4MB, and this larger
+ * range is also used for integrated gpus beginning with Meteor Lake.
*/
- if (GRAPHICS_VER(i915) < 5)
- mmio_size = 512 * 1024;
- else if (IS_DGFX(i915))
+ if (IS_DGFX(i915) || GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
mmio_size = 4 * 1024 * 1024;
- else
+ else if (GRAPHICS_VER(i915) >= 5)
mmio_size = 2 * 1024 * 1024;
+ else
+ mmio_size = 512 * 1024;

uncore->regs = ioremap(phys_addr, mmio_size);
if (uncore->regs == NULL) {
--
2.25.1