[Intel-gfx] [PATCH 6/8] drm/i915/adl_s: Update memory bandwidth parameters

[Aditya Swarup]

From: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>

Just like RKL, the ADL_S platform also has different memory
characteristics from past platforms.  Update the values used
by our memory bandwidth calculations accordingly.

v2: Fix minor nitpick for shifting ADLS case above RKL(based on platform
order).(mdroper)

Bspec: 64631
Cc: Matt Roper <matthew.d.roper at intel.com>
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>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
Signed-off-by: Aditya Swarup <aditya.swarup at intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 4b5a30ac84bc..ec803861acb2 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -142,6 +142,12 @@ static const struct intel_sa_info rkl_sa_info = {
 	.displayrtids = 128,
 };
 
+static const struct intel_sa_info adls_sa_info = {
+	.deburst = 16,
+	.deprogbwlimit = 38, /* GB/s */
+	.displayrtids = 256,
+};
+
 static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct intel_sa_info *sa)
 {
 	struct intel_qgv_info qi = {};
@@ -251,7 +257,10 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
 	if (!HAS_DISPLAY(dev_priv))
 		return;
 
-	if (IS_ROCKETLAKE(dev_priv))
+
+	if (IS_ALDERLAKE_S(dev_priv))
+		icl_get_bw_info(dev_priv, &adls_sa_info);
+	else if (IS_ROCKETLAKE(dev_priv))
 		icl_get_bw_info(dev_priv, &rkl_sa_info);
 	else if (IS_GEN(dev_priv, 12))
 		icl_get_bw_info(dev_priv, &tgl_sa_info);
-- 
2.27.0