[Intel-gfx] [PATCH v8 2/7] drm/i915: update the QGV point frequency calculations

[Vinod Govindapillai]

>From MTL onwwards, pcode locks the QGV point based on peak BW of
the intended QGV point passed by the driver. So the peak BW
calculation must match the value expected by the pcode. Update
the calculations as per the Bspec.

v2: use DIV_ROUND_* macro for the calculations (Ville)

v3: Use only DIV_ROUN_CLOSEST and remove divisor / 2 again

Bspec: 64636

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

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index ab405c48ca3a..61b3babf2d83 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -182,7 +182,7 @@ static int mtl_read_qgv_point_info(struct drm_i915_private *dev_priv,
 	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->dclk = DIV_ROUND_CLOSEST(16667 * dclk, 1000);
 	sp->t_rp = REG_FIELD_GET(MTL_TRP_MASK, val);
 	sp->t_rcd = REG_FIELD_GET(MTL_TRCD_MASK, val);
 
-- 
2.34.1