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Merge tag 'drm-intel-next-fixes-2021-04-30' of git://anongit.freedesktop.org/drm/drm-intel into drm-next 

drm/i915 GVT fixes for v5.13-rc1:
- Fix a possible division by zero in vgpu display rate calculation

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/87wnsk16sa.fsf@intel.com
This commit is contained in:
Dave Airlie 2021-05-07 11:55:43 +10:00
parent 1cd6b4a04f c7b397e9ca
commit 365002da3c
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/i915/gvt/handlers.c
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@ -669,8 +669,8 @@ static void vgpu_update_refresh_rate(struct intel_vgpu *vgpu)
link_n = vgpu_vreg_t(vgpu, PIPE_LINK_N1(TRANSCODER_A));
/* Get H/V total from transcoder timing */
htotal = (vgpu_vreg_t(vgpu, HTOTAL(TRANSCODER_A)) >> TRANS_HTOTAL_SHIFT) + 1;
vtotal = (vgpu_vreg_t(vgpu, VTOTAL(TRANSCODER_A)) >> TRANS_VTOTAL_SHIFT) + 1;
htotal = (vgpu_vreg_t(vgpu, HTOTAL(TRANSCODER_A)) >> TRANS_HTOTAL_SHIFT);
vtotal = (vgpu_vreg_t(vgpu, VTOTAL(TRANSCODER_A)) >> TRANS_VTOTAL_SHIFT);
if (dp_br && link_n && htotal && vtotal) {
u64 pixel_clk = 0;
@ -682,7 +682,7 @@ static void vgpu_update_refresh_rate(struct intel_vgpu *vgpu)
pixel_clk *= MSEC_PER_SEC;
/* Calcuate refresh rate by (pixel_clk / (h_total * v_total)) */
new_rate = DIV64_U64_ROUND_CLOSEST(pixel_clk, div64_u64(mul_u32_u32(htotal, vtotal), MSEC_PER_SEC));
new_rate = DIV64_U64_ROUND_CLOSEST(mul_u64_u32_shr(pixel_clk, MSEC_PER_SEC, 0), mul_u32_u32(htotal + 1, vtotal + 1));
if (*old_rate != new_rate)
*old_rate = new_rate;