[Intel-gfx] [PATCH v2 15/21] drm/i915/mtl: Obtain SAGV values from MMIO instead of GT pcode mailbox

Radhakrishna Sripada
2022-08-24T19:14:52Z

From Meteorlake, Latency Level, SAGV bloack time are read from
LATENCY_SAGV register instead of the GT driver pcode mailbox. DDR type
and QGV information are also to be read from Mem SS registers.

v2:
- Simplify MTL_MEM_SS_INFO_QGV_POINT macro(MattR)
- Nit: Rearrange the bit def's from higher to lower(MattR)
- Restore platform definition for ADL-P(MattR)
- Move back intel_qgv_point def to intel_bw.c(Jani)
Bspec: 64636, 64608

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Original Author: Caz Yokoyama
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
---
drivers/gpu/drm/i915/display/intel_bw.c | 42 ++++++++++++++++++++++---
drivers/gpu/drm/i915/i915_reg.h | 16 ++++++++++
drivers/gpu/drm/i915/intel_dram.c | 41 +++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_pm.c | 8 ++++-
4 files changed, 100 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 79269d2c476b..46b63afd536a 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -137,6 +137,42 @@ int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
return 0;
}

+static int mtl_read_qgv_point_info(struct drm_i915_private *dev_priv,
+ struct intel_qgv_point *sp, int point)
+{
+ u32 val, val2;
+ u16 dclk;
+
+ val = intel_uncore_read(&dev_priv->uncore,
+ MTL_MEM_SS_INFO_QGV_POINT_LOW(point));
+ val2 = intel_uncore_read(&dev_priv->uncore,
+ MTL_MEM_SS_INFO_QGV_POINT_HIGH(point));
+ dclk = REG_FIELD_GET(MTL_DCLK_MASK, val);
+ sp->dclk = DIV_ROUND_UP((16667 * dclk), 1000);
+ sp->t_rp = REG_FIELD_GET(MTL_TRP_MASK, val);
+ sp->t_rcd = REG_FIELD_GET(MTL_TRCD_MASK, val);
+
+ sp->t_rdpre = REG_FIELD_GET(MTL_TRDPRE_MASK, val2);
+ sp->t_ras = REG_FIELD_GET(MTL_TRAS_MASK, val2);
+
+ sp->t_rc = sp->t_rp + sp->t_ras;
+
+ return 0;
+}
+
+static int
+intel_read_qgv_point_info(struct drm_i915_private *dev_priv,
+ struct intel_qgv_point *sp,
+ int point)
+{
+ if (DISPLAY_VER(dev_priv) >= 14)
+ return mtl_read_qgv_point_info(dev_priv, sp, point);
+ else if (IS_DG1(dev_priv))
+ return dg1_mchbar_read_qgv_point_info(dev_priv, sp, point);
+ else
+ return icl_pcode_read_qgv_point_info(dev_priv, sp, point);
+}
+
static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
struct intel_qgv_info *qi,
bool is_y_tile)
@@ -193,11 +229,7 @@ static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
for (i = 0; i < qi->num_points; i++) {
struct intel_qgv_point *sp = &qi->points[i];

- if (IS_DG1(dev_priv))
- ret = dg1_mchbar_read_qgv_point_info(dev_priv, sp, i);
- else
- ret = icl_pcode_read_qgv_point_info(dev_priv, sp, i);
-
+ ret = intel_read_qgv_point_info(dev_priv, sp, i);
if (ret)
return ret;

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b2d5e1230c25..5245af8d0ea8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8397,4 +8397,20 @@ enum skl_power_gate {
#define MTL_LATENCY_LEVEL0_2_4_MASK REG_GENMASK(12, 0)
#define MTL_LATENCY_LEVEL1_3_5_MASK REG_GENMASK(28, 16)

+#define MTL_LATENCY_SAGV _MMIO(0x4578c)
+#define MTL_LATENCY_QCLK_SAGV REG_GENMASK(12, 0)
+
+#define MTL_MEM_SS_INFO_GLOBAL _MMIO(0x45700)
+#define MTL_DDR_TYPE_MASK REG_GENMASK(3, 0)
+#define MTL_N_OF_POPULATED_CH_MASK REG_GENMASK(7, 4)
+#define MTL_N_OF_ENABLED_QGV_POINTS_MASK REG_GENMASK(11, 8)
+
+#define MTL_MEM_SS_INFO_QGV_POINT_LOW(point) _MMIO(0x45710 + (point) * 2)
+#define MTL_MEM_SS_INFO_QGV_POINT_HIGH(point) _MMIO(0x45714 + (point) * 2)
+#define MTL_TRCD_MASK REG_GENMASK(31, 24)
+#define MTL_TRP_MASK REG_GENMASK(23, 16)
+#define MTL_TRAS_MASK REG_GENMASK(16, 8)
+#define MTL_DCLK_MASK REG_GENMASK(15, 0)
+#define MTL_TRDPRE_MASK REG_GENMASK(7, 0)
+
#endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_dram.c b/drivers/gpu/drm/i915/intel_dram.c
index 437447119770..2403ccd52c74 100644
--- a/drivers/gpu/drm/i915/intel_dram.c
+++ b/drivers/gpu/drm/i915/intel_dram.c
@@ -466,6 +466,43 @@ static int gen12_get_dram_info(struct drm_i915_private *i915)
return icl_pcode_read_mem_global_info(i915);
}

+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) {
+ case 0:
+ dram_info->type = INTEL_DRAM_DDR4;
+ break;
+ case 1:
+ dram_info->type = INTEL_DRAM_DDR5;
+ break;
+ case 2:
+ dram_info->type = INTEL_DRAM_LPDDR5;
+ break;
+ case 3:
+ dram_info->type = INTEL_DRAM_LPDDR4;
+ break;
+ case 4:
+ dram_info->type = INTEL_DRAM_DDR3;
+ break;
+ case 5:
+ dram_info->type = INTEL_DRAM_LPDDR3;
+ break;
+ default:
+ MISSING_CASE(val);
+ return -EINVAL;
+ }
+
+ dram_info->num_channels = REG_FIELD_GET(MTL_N_OF_POPULATED_CH_MASK, val);
+ dram_info->num_qgv_points = REG_FIELD_GET(MTL_N_OF_ENABLED_QGV_POINTS_MASK, val);
+ /* PSF GV points not supported in D14+ */
+
+ return 0;
+}
+
void intel_dram_detect(struct drm_i915_private *i915)
{
struct dram_info *dram_info = &i915->dram_info;
@@ -480,7 +517,9 @@ void intel_dram_detect(struct drm_i915_private *i915)
*/
dram_info->wm_lv_0_adjust_needed = !IS_GEN9_LP(i915);

- if (GRAPHICS_VER(i915) >= 12)
+ if (DISPLAY_VER(i915) >= 14)
+ ret = xelpdp_get_dram_info(i915);
+ else if (GRAPHICS_VER(i915) >= 12)
ret = gen12_get_dram_info(i915);
else if (GRAPHICS_VER(i915) >= 11)
ret = gen11_get_dram_info(i915);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index fac565d23d57..f71b3b8b590c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3698,7 +3698,13 @@ intel_has_sagv(struct drm_i915_private *dev_priv)
static u32
intel_sagv_block_time(struct drm_i915_private *dev_priv)
{
- if (DISPLAY_VER(dev_priv) >= 12) {
+ if (DISPLAY_VER(dev_priv) >= 14) {
+ u32 val;
+
+ val = intel_uncore_read(&dev_priv->uncore, MTL_LATENCY_SAGV);
+
+ return REG_FIELD_GET(MTL_LATENCY_QCLK_SAGV, val);
+ } else if (DISPLAY_VER(dev_priv) >= 12) {
u32 val = 0;
int ret;

--
2.25.1