On Wed, Sep 19, 2018 at 03:13:12PM -0400, Sean Paul wrote:
> On Wed, Sep 19, 2018 at 11:44:14AM -0400, Bruce Wang wrote:
> > All checks for _dpu_crtc_power_enable are not true, so the function
> > can never return an error code. All calls of the function have also
> > been changed so that they don't expect a return value.
> >
> > Signed-off-by: Bruce Wang <bzwang@xxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c | 35 ++++--------------------
> > 1 file changed, 5 insertions(+), 30 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > index 017d16131dac..f0b52281c46f 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_crtc.c
> > @@ -60,37 +60,16 @@ static inline struct dpu_kms *_dpu_crtc_get_kms(struct drm_crtc *crtc)
> > return to_dpu_kms(priv->kms);
> > }
> >
> > -static inline int _dpu_crtc_power_enable(struct dpu_crtc *dpu_crtc, bool enable)
> > +static inline void _dpu_crtc_power_enable(struct dpu_crtc *dpu_crtc, bool enable)
> > {
> > - struct drm_crtc *crtc;
> > - struct msm_drm_private *priv;
> > - struct dpu_kms *dpu_kms;
> > -
> > - if (!dpu_crtc) {
> > - DPU_ERROR("invalid dpu crtc\n");
> > - return -EINVAL;
> > - }
> > -
> > - crtc = &dpu_crtc->base;
> > - if (!crtc->dev || !crtc->dev->dev_private) {
> > - DPU_ERROR("invalid drm device\n");
> > - return -EINVAL;
> > - }
> > -
> > - priv = crtc->dev->dev_private;
> > - if (!priv->kms) {
> > - DPU_ERROR("invalid kms\n");
> > - return -EINVAL;
> > - }
> > -
> > - dpu_kms = to_dpu_kms(priv->kms);
> > + struct drm_crtc *crtc = &dpu_crtc->base;
> > + struct msm_drm_private *priv = crtc->dev->dev_private;
> > + struct dpu_kms *dpu_kms = to_dpu_kms(priv->kms);
> >
> > if (enable)
> > pm_runtime_get_sync(&dpu_kms->pdev->dev);
> > else
> > pm_runtime_put_sync(&dpu_kms->pdev->dev);
> > -
> > - return 0;
> > }
> >
> > static void dpu_crtc_destroy(struct drm_crtc *crtc)
> > @@ -849,14 +828,10 @@ static int _dpu_crtc_vblank_enable_no_lock(
>
> I think this can go to void now too since the if (!dpu_crtc) check at the top is
> a no-op.
>
> This is a good thing, too since this function is only called from void functions
> with one exception where its return value isn't passed on!
In light of patch 5/5,
Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
>
> Sean
>
> > dev = crtc->dev;
> >
> > if (enable) {
> > - int ret;
> > -
> > /* drop lock since power crtc cb may try to re-acquire lock */
> > mutex_unlock(&dpu_crtc->crtc_lock);
> > - ret = _dpu_crtc_power_enable(dpu_crtc, true);
> > + _dpu_crtc_power_enable(dpu_crtc, true);
> > mutex_lock(&dpu_crtc->crtc_lock);
> > - if (ret)
> > - return ret;
> >
> > list_for_each_entry(enc, &dev->mode_config.encoder_list, head) {
> > if (enc->crtc != crtc)
> > --
> > 2.19.0.397.gdd90340f6a-goog
> >
>
> --
> Sean Paul, Software Engineer, Google / Chromium OS
--
Sean Paul, Software Engineer, Google / Chromium OS
