[PATCH v10 5/6] drm/i915/display: handle systems with duplicate psf gv points

[Vinod Govindapillai]

From: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>

There could be multiple qgv and psf gv points with similar values.
Apparently pcode's handling og psf and qgv points are different. For
qgv case, pcode sets whatever is asked by the driver. But in case
of psf gv points, it compares the bw from points before setting the
mask. This can cause problems in scenarios where we have to disable
sagv by setting the highest bw point and there could be multiple
points with highest bw. So to set the maximum psf gv point, find
out all the points with the highest bw and set all together.

v1: - use the same treatment to qgv points as well (Vinod)

v2: - pcode confirms that for qgv points, it sets whatever the
      driver sets (Vinod)

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 5f4f93524bef..6fb228a1a28f 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -874,6 +874,8 @@ static unsigned int icl_max_bw_psf_gv_point_mask(struct drm_i915_private *i915)
 		if (max_data_rate > max_bw) {
 			max_bw_point_mask = BIT(i);
 			max_bw = max_data_rate;
+		} else if (max_data_rate == max_bw) {
+			max_bw_point_mask |= BIT(i);
 		}
 	}
 
-- 
2.34.1