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drm/i915/bw: Fix bw rounding direction

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The DRAM bandwidth value should be rounded down, not up.

Bspec: 64631
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260522200346.17377-4-ville.syrjala@linux.intel.com
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
This commit is contained in:
Ville Syrjälä 2026-05-22 23:03:39 +03:00
parent 1f0d572b27
commit 615b23a7d2
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/display/intel_bw.c
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@ -555,7 +555,7 @@ static int icl_get_bw_info(struct intel_display *display,
*/
ct = max_t(int, sp->t_rc, sp->t_rp + sp->t_rcd +
(clpchgroup - 1) * qi.t_bl + sp->t_rdpre);
bw = DIV_ROUND_UP(sp->dclk * clpchgroup * 32 * num_channels, ct);
bw = sp->dclk * clpchgroup * 32 * num_channels / ct;
bi->deratedbw[j] = min(maxdebw,
bw * (100 - soc_bw_params->derating) / 100);
@ -658,7 +658,7 @@ static int tgl_get_bw_info(struct intel_display *display,
*/
ct = max_t(int, sp->t_rc, sp->t_rp + sp->t_rcd +
(clpchgroup - 1) * qi.t_bl + sp->t_rdpre);
bw = DIV_ROUND_UP(sp->dclk * clpchgroup * 32 * num_channels, ct);
bw = sp->dclk * clpchgroup * 32 * num_channels / ct;
bi->deratedbw[j] = min(maxdebw,
bw * (100 - soc_bw_params->derating) / 100);