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

[Radhakrishna Sripada]

Earlier while calculating derated bw we would use 90% of the calculated
bw. Starting ADL-P we use a non standard derating. Updating the formulae
to reflect the same.

Bspec: 64631

Fixes: 4d32fe2f14a7 ("drm/i915/adl_p: Update memory bandwidth parameters")
Cc: Matt Roper <matthew.d.ro...@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.srip...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c 
b/drivers/gpu/drm/i915/display/intel_bw.c
index e91e0e0191fb..23121ddd2580 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -222,31 +222,35 @@ static int icl_sagv_max_dclk(const struct intel_qgv_info 
*qi)
 
 struct intel_sa_info {
        u16 displayrtids;
-       u8 deburst, deprogbwlimit;
+       u8 deburst, deprogbwlimit, derating;
 };
 
 static const struct intel_sa_info icl_sa_info = {
        .deburst = 8,
        .deprogbwlimit = 25, /* GB/s */
        .displayrtids = 128,
+       .derating = 10,
 };
 
 static const struct intel_sa_info tgl_sa_info = {
        .deburst = 16,
        .deprogbwlimit = 34, /* GB/s */
        .displayrtids = 256,
+       .derating = 10,
 };
 
 static const struct intel_sa_info rkl_sa_info = {
        .deburst = 16,
        .deprogbwlimit = 20, /* GB/s */
        .displayrtids = 128,
+       .derating = 10,
 };
 
 static const struct intel_sa_info adls_sa_info = {
        .deburst = 16,
        .deprogbwlimit = 38, /* GB/s */
        .displayrtids = 256,
+       .derating = 20,
 };
 
 static int icl_get_bw_info(struct drm_i915_private *dev_priv, const struct 
intel_sa_info *sa)
@@ -302,7 +306,7 @@ static int icl_get_bw_info(struct drm_i915_private 
*dev_priv, const struct intel
                        bw = icl_calc_bw(sp->dclk, clpchgroup * 32 * 
num_channels, ct);
 
                        bi->deratedbw[j] = min(maxdebw,
-                                              bw * 9 / 10); /* 90% */
+                                              bw * (100 - sa->derating) / 100);
 
                        drm_dbg_kms(&dev_priv->drm,
                                    "BW%d / QGV %d: num_planes=%d 
deratedbw=%u\n",
-- 
2.20.1