[Intel-gfx] [PATCH 2/9] drm/i915/adl_s: MCHBAR memory info registers are moved

[Aditya Swarup]

From: Caz Yokoyama <caz.yokoyama at intel.com>

The crwebview indicates on ADL-S that some of our MCHBAR
registers have moved from their traditional 0x50XX offsets to
new locations. The meaning and bit layout of the registers
remain same.

v2: Simplify logic to a single if else chain and fix indents.(Lucas)

v3: Fix bug due to assignment of ADLS offsets in both if/else
branches in function skl_dram_get_channels_info().(Lucas)

Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Caz Yokoyama <caz.yokoyama at intel.com>
Signed-off-by: Aditya Swarup <aditya.swarup at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h   |  5 +++++
 drivers/gpu/drm/i915/intel_dram.c | 24 ++++++++++++++++++------
 2 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index aa872446337b..3031897239a0 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10916,6 +10916,8 @@ enum skl_power_gate {
 #define  SKL_DRAM_DDR_TYPE_LPDDR3		(2 << 0)
 #define  SKL_DRAM_DDR_TYPE_LPDDR4		(3 << 0)
 
+#define ADLS_MAD_INTER_CHANNEL_0_0_0_MCHBAR _MMIO(MCHBAR_MIRROR_BASE_SNB + 0x6048)
+
 #define SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN	_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x500C)
 #define SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN	_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x5010)
 #define  SKL_DRAM_S_SHIFT			16
@@ -10943,6 +10945,9 @@ enum skl_power_gate {
 #define  CNL_DRAM_RANK_3			(0x2 << 9)
 #define  CNL_DRAM_RANK_4			(0x3 << 9)
 
+#define ADLS_MAD_DIMM_CH0_0_0_0_MCHBAR		_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x6054)
+#define ADLS_MAD_DIMM_CH1_0_0_0_MCHBAR		_MMIO(MCHBAR_MIRROR_BASE_SNB + 0x6058)
+
 /*
  * Please see hsw_read_dcomp() and hsw_write_dcomp() before using this register,
  * since on HSW we can't write to it using intel_uncore_write.
diff --git a/drivers/gpu/drm/i915/intel_dram.c b/drivers/gpu/drm/i915/intel_dram.c
index 4754296a250e..c61ae4b6dc86 100644
--- a/drivers/gpu/drm/i915/intel_dram.c
+++ b/drivers/gpu/drm/i915/intel_dram.c
@@ -181,17 +181,24 @@ skl_dram_get_channels_info(struct drm_i915_private *i915)
 {
 	struct dram_info *dram_info = &i915->dram_info;
 	struct dram_channel_info ch0 = {}, ch1 = {};
+	i915_reg_t ch0_reg, ch1_reg;
 	u32 val;
 	int ret;
 
-	val = intel_uncore_read(&i915->uncore,
-				SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN);
+	if (IS_ALDERLAKE_S(i915)) {
+		ch0_reg = ADLS_MAD_DIMM_CH0_0_0_0_MCHBAR;
+		ch1_reg = ADLS_MAD_DIMM_CH1_0_0_0_MCHBAR;
+	} else {
+		ch0_reg = SKL_MAD_DIMM_CH0_0_0_0_MCHBAR_MCMAIN;
+		ch1_reg = SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN;
+	}
+
+	val = intel_uncore_read(&i915->uncore, ch0_reg);
 	ret = skl_dram_get_channel_info(i915, &ch0, 0, val);
 	if (ret == 0)
 		dram_info->num_channels++;
 
-	val = intel_uncore_read(&i915->uncore,
-				SKL_MAD_DIMM_CH1_0_0_0_MCHBAR_MCMAIN);
+	val = intel_uncore_read(&i915->uncore, ch1_reg);
 	ret = skl_dram_get_channel_info(i915, &ch1, 1, val);
 	if (ret == 0)
 		dram_info->num_channels++;
@@ -229,10 +236,15 @@ skl_dram_get_channels_info(struct drm_i915_private *i915)
 static enum intel_dram_type
 skl_get_dram_type(struct drm_i915_private *i915)
 {
+	i915_reg_t reg;
 	u32 val;
 
-	val = intel_uncore_read(&i915->uncore,
-				SKL_MAD_INTER_CHANNEL_0_0_0_MCHBAR_MCMAIN);
+	if (IS_ALDERLAKE_S(i915))
+		reg = ADLS_MAD_INTER_CHANNEL_0_0_0_MCHBAR;
+	else
+		reg = SKL_MAD_INTER_CHANNEL_0_0_0_MCHBAR_MCMAIN;
+
+	val = intel_uncore_read(&i915->uncore, reg);
 
 	switch (val & SKL_DRAM_DDR_TYPE_MASK) {
 	case SKL_DRAM_DDR_TYPE_DDR3:
-- 
2.27.0