[PATCH 05/32] drm/i915/dram: Add field ecc_impacting_de

[Gustavo Sousa <gustavo.sousa@intel.com>]

Starting with Xe3p_LPD, we now have a new field in MEM_SS_INFO_GLOBAL
that indicates whether the memory has enabled ECC that limits display
bandwidth.  Add the field ecc_impacting_de to struct dram_info to
contain that information and set it appropriately when probing for
memory info.  We will use that field when updating bandwidth parameters
for Xe3p_LPD.

Bspec: 69131
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h       | 1 +
 drivers/gpu/drm/i915/soc/intel_dram.c | 4 ++++
 drivers/gpu/drm/i915/soc/intel_dram.h | 1 +
 3 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 354ef75ef6a5..5bf3b4ab2baa 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1233,6 +1233,7 @@
 #define   OROM_OFFSET_MASK			REG_GENMASK(20, 16)
 
 #define MTL_MEM_SS_INFO_GLOBAL			_MMIO(0x45700)
+#define   XE3P_ECC_IMPACTING_DE			REG_BIT(12)
 #define   MTL_N_OF_ENABLED_QGV_POINTS_MASK	REG_GENMASK(11, 8)
 #define   MTL_N_OF_POPULATED_CH_MASK		REG_GENMASK(7, 4)
 #define   MTL_DDR_TYPE_MASK			REG_GENMASK(3, 0)
diff --git a/drivers/gpu/drm/i915/soc/intel_dram.c b/drivers/gpu/drm/i915/soc/intel_dram.c
index 8841cfe1cac8..bf9f8e38d6ba 100644
--- a/drivers/gpu/drm/i915/soc/intel_dram.c
+++ b/drivers/gpu/drm/i915/soc/intel_dram.c
@@ -685,6 +685,7 @@ static int gen12_get_dram_info(struct drm_i915_private *i915, struct dram_info *
 
 static int xelpdp_get_dram_info(struct drm_i915_private *i915, struct dram_info *dram_info)
 {
+	struct intel_display *display = i915->display;
 	u32 val = intel_uncore_read(&i915->uncore, MTL_MEM_SS_INFO_GLOBAL);
 
 	switch (REG_FIELD_GET(MTL_DDR_TYPE_MASK, val)) {
@@ -723,6 +724,9 @@ static int xelpdp_get_dram_info(struct drm_i915_private *i915, struct dram_info
 	dram_info->num_qgv_points = REG_FIELD_GET(MTL_N_OF_ENABLED_QGV_POINTS_MASK, val);
 	/* PSF GV points not supported in D14+ */
 
+	if (DISPLAY_VER(display) >= 35)
+		dram_info->ecc_impacting_de = REG_FIELD_GET(XE3P_ECC_IMPACTING_DE, val);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/soc/intel_dram.h b/drivers/gpu/drm/i915/soc/intel_dram.h
index 03a973f1c941..ac77f1ab409f 100644
--- a/drivers/gpu/drm/i915/soc/intel_dram.h
+++ b/drivers/gpu/drm/i915/soc/intel_dram.h
@@ -30,6 +30,7 @@ struct dram_info {
 	u8 num_channels;
 	u8 num_qgv_points;
 	u8 num_psf_gv_points;
+	bool ecc_impacting_de; /* Only valid from Xe3p_LPD onward. */
 	bool symmetric_memory;
 	bool has_16gb_dimms;
 };

-- 
2.51.0