drm/i915/dram: Populate PNV memory type accurately

If PNV doesn't have DDR3 then it has DDR2. Add the appropriate memory
type for it.

No functional change since we currently only care about the
DDR3 vs. not difference.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250902133113.18778-2-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

Author: vsyrjala

drivers/gpu/drm/i915/soc/intel_dram.c

@@ -35,6 +35,7 @@ static const char *intel_dram_type_str(enum intel_dram_type type)
 {
 	static const char * const str[] = {
 		DRAM_TYPE_STR(UNKNOWN),
+		DRAM_TYPE_STR(DDR2),
 		DRAM_TYPE_STR(DDR3),
 		DRAM_TYPE_STR(DDR4),
 		DRAM_TYPE_STR(LPDDR3),
@@ -55,9 +56,10 @@ static const char *intel_dram_type_str(enum intel_dram_type type)
 
 #undef DRAM_TYPE_STR
 
-static bool pnv_is_ddr3(struct drm_i915_private *i915)
+static enum intel_dram_type pnv_dram_type(struct drm_i915_private *i915)
 {
-	return intel_uncore_read(&i915->uncore, CSHRDDR3CTL) & CSHRDDR3CTL_DDR3;
+	return intel_uncore_read(&i915->uncore, CSHRDDR3CTL) & CSHRDDR3CTL_DDR3 ?
+		INTEL_DRAM_DDR3 : INTEL_DRAM_DDR2;
 }
 
 static unsigned int pnv_mem_freq(struct drm_i915_private *dev_priv)
@@ -252,8 +254,8 @@ static int i915_get_dram_info(struct drm_i915_private *i915, struct dram_info *d
 	if (dram_info->mem_freq)
 		drm_dbg(&i915->drm, "DDR speed: %d kHz\n", dram_info->mem_freq);
 
-	if (IS_PINEVIEW(i915) && pnv_is_ddr3(i915))
-		dram_info->type = INTEL_DRAM_DDR3;
+	if (IS_PINEVIEW(i915))
+		dram_info->type = pnv_dram_type(i915);
 
 	return 0;
 }

drivers/gpu/drm/i915/soc/intel_dram.h

@@ -17,6 +17,7 @@ struct dram_info {
 	bool symmetric_memory;
 	enum intel_dram_type {
 		INTEL_DRAM_UNKNOWN,
+		INTEL_DRAM_DDR2,
 		INTEL_DRAM_DDR3,
 		INTEL_DRAM_DDR4,
 		INTEL_DRAM_LPDDR3,