[Intel-gfx] [PATCH v2 1/2] drm/i915/mtl: Fix dram info readout

[Radhakrishna Sripada]

Register info read from the hardware is being cleared out. Preserve
the register value and use extracted fields in the logic.

Fixes: 825477e77912 ("drm/i915/mtl: Obtain SAGV values from MMIO instead of GT 
pcode mailbox")
Cc: Matt Roper <matthew.d.ro...@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.srip...@intel.com>
---
 drivers/gpu/drm/i915/intel_dram.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dram.c 
b/drivers/gpu/drm/i915/intel_dram.c
index 2403ccd52c74..bba8cb6e8ae4 100644
--- a/drivers/gpu/drm/i915/intel_dram.c
+++ b/drivers/gpu/drm/i915/intel_dram.c
@@ -471,8 +471,7 @@ static int xelpdp_get_dram_info(struct drm_i915_private 
*i915)
        u32 val = intel_uncore_read(&i915->uncore, MTL_MEM_SS_INFO_GLOBAL);
        struct dram_info *dram_info = &i915->dram_info;
 
-       val = REG_FIELD_GET(MTL_DDR_TYPE_MASK, val);
-       switch (val) {
+       switch (REG_FIELD_GET(MTL_DDR_TYPE_MASK, val)) {
        case 0:
                dram_info->type = INTEL_DRAM_DDR4;
                break;
-- 
2.34.1