[Intel-gfx] [PATCH 21/21] drm/i915/adl_s: Update memory bandwidth parameters

Aditya Swarup
2020-11-17T18:51:07Z

From: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@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.

Bspec: 64631
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Signed-off-by: Aditya Swarup <aditya.swarup@intel.com>
---
drivers/gpu/drm/i915/display/intel_bw.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index bd060404d249..32522ec1ffb9 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -205,6 +205,12 @@ 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 = {};
@@ -317,6 +323,8 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)

if (IS_ROCKETLAKE(dev_priv))
icl_get_bw_info(dev_priv, &rkl_sa_info);
+ else if (IS_ALDERLAKE_S(dev_priv))
+ icl_get_bw_info(dev_priv, &adls_sa_info);
else if (IS_GEN(dev_priv, 12))
icl_get_bw_info(dev_priv, &tgl_sa_info);
else if (IS_GEN(dev_priv, 11))
--
2.27.0