Jessica Zhang <quic_jesszhan@xxxxxxxxxxx> 于2025年1月9日周四 07:41写道：
>
>
>
> On 12/19/2024 2:09 PM, Dmitry Baryshkov wrote:
> > On Thu, Dec 19, 2024 at 03:49:22PM +0800, Jun Nie wrote:
> >> decide right side of a pair per last bit, in case of multiple
> >> mixer pairs.
> >
> > Proper English sentences, please. Also describe why, not what.
>
> Hi Jun,
>
> Can we also add a note in the commit message on why the last bit check
> works?
Sure. How about this?
Currently we only support one pair of mixer, so counter's
non-zero value is enough to mark the right one. There will
be case with multiple mixer pairs, so let's use the last bit to
mark the right mixer in a mixer pair. If the last bit is set, it
marks the right mixer in the pair, it's left mixer otherwise.
>
> Thanks,
>
> Jessica Zhang
>
> >
> >>
> >> Signed-off-by: Jun Nie <jun.nie@xxxxxxxxxx>
> >> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> >> ---
> >> drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 5 ++---
> >> 1 file changed, 2 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> index 7191b1a6d41b3..41c9d3e3e3c7c 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> >> @@ -369,11 +369,10 @@ static void _dpu_crtc_setup_blend_cfg(struct dpu_crtc_mixer *mixer,
> >> static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> >> {
> >> struct dpu_crtc_state *crtc_state;
> >> - int lm_idx, lm_horiz_position;
> >> + int lm_idx;
> >>
> >> crtc_state = to_dpu_crtc_state(crtc->state);
> >>
> >> - lm_horiz_position = 0;
> >> for (lm_idx = 0; lm_idx < crtc_state->num_mixers; lm_idx++) {
> >> const struct drm_rect *lm_roi = &crtc_state->lm_bounds[lm_idx];
> >> struct dpu_hw_mixer *hw_lm = crtc_state->mixers[lm_idx].hw_lm;
> >> @@ -384,7 +383,7 @@ static void _dpu_crtc_program_lm_output_roi(struct drm_crtc *crtc)
> >>
> >> cfg.out_width = drm_rect_width(lm_roi);
> >> cfg.out_height = drm_rect_height(lm_roi);
> >> - cfg.right_mixer = lm_horiz_position++;
> >> + cfg.right_mixer = lm_idx & 0x1;
> >> cfg.flags = 0;
> >> hw_lm->ops.setup_mixer_out(hw_lm, &cfg);
> >> }
> >>
> >> --
> >> 2.34.1
> >>
> >
> > --
> > With best wishes
> > Dmitry
>
