[PATCH v2 16/19] drm/msm/dpu: modify encoder programming for CDM over DP
Dmitry Baryshkov
dmitry.baryshkov at linaro.org
Tue Feb 13 18:23:29 UTC 2024
On Tue, 13 Feb 2024 at 19:32, Abhinav Kumar <quic_abhinavk at quicinc.com> wrote:
>
>
>
> On 2/13/2024 3:18 AM, Dmitry Baryshkov wrote:
> > On Sat, 10 Feb 2024 at 03:53, Paloma Arellano <quic_parellan at quicinc.com> wrote:
> >>
> >> Adjust the encoder format programming in the case of video mode for DP
> >> to accommodate CDM related changes.
> >>
> >> Changes in v2:
> >> - Move timing engine programming to a separate patch from this
> >> one
> >> - Move update_pending_flush_periph() invocation completely to
> >> this patch
> >> - Change the logic of dpu_encoder_get_drm_fmt() so that it only
> >> calls drm_mode_is_420_only() instead of doing additional
> >> unnecessary checks
> >> - Create new functions msm_dp_needs_periph_flush() and it's
> >> supporting function dpu_encoder_needs_periph_flush() to check
> >> if the mode is YUV420 and VSC SDP is enabled before doing a
> >> peripheral flush
> >>
> >> Signed-off-by: Paloma Arellano <quic_parellan at quicinc.com>
> >> ---
> >> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 35 +++++++++++++++++++
> >> .../gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 13 +++++++
> >> .../drm/msm/disp/dpu1/dpu_encoder_phys_vid.c | 19 ++++++++++
> >> drivers/gpu/drm/msm/dp/dp_display.c | 18 ++++++++++
> >> drivers/gpu/drm/msm/msm_drv.h | 17 ++++++++-
> >> 5 files changed, 101 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> index 7e7796561009a..6280c6be6dca9 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >> @@ -222,6 +222,41 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
> >> 15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
> >> };
> >>
> >> +u32 dpu_encoder_get_drm_fmt(struct dpu_encoder_phys *phys_enc)
> >> +{
> >> + struct drm_encoder *drm_enc;
> >> + struct dpu_encoder_virt *dpu_enc;
> >> + struct drm_display_info *info;
> >> + struct drm_display_mode *mode;
> >> +
> >> + drm_enc = phys_enc->parent;
> >> + dpu_enc = to_dpu_encoder_virt(drm_enc);
> >> + info = &dpu_enc->connector->display_info;
> >> + mode = &phys_enc->cached_mode;
> >> +
> >> + if (drm_mode_is_420_only(info, mode))
> >> + return DRM_FORMAT_YUV420;
> >> +
> >> + return DRM_FORMAT_RGB888;
> >> +}
> >> +
> >> +bool dpu_encoder_needs_periph_flush(struct dpu_encoder_phys *phys_enc)
> >> +{
> >> + struct drm_encoder *drm_enc;
> >> + struct dpu_encoder_virt *dpu_enc;
> >> + struct msm_display_info *disp_info;
> >> + struct msm_drm_private *priv;
> >> + struct drm_display_mode *mode;
> >> +
> >> + drm_enc = phys_enc->parent;
> >> + dpu_enc = to_dpu_encoder_virt(drm_enc);
> >> + disp_info = &dpu_enc->disp_info;
> >> + priv = drm_enc->dev->dev_private;
> >> + mode = &phys_enc->cached_mode;
> >> +
> >> + return phys_enc->hw_intf->cap->type == INTF_DP && phys_enc->hw_cdm &&
> >
> > Do we really need to check for phys_enc->hw_cdm here?
> >
>
> hmmm I dont think so. If CDM was not there, then after the last patch,
> YUV420 removes will not be present at all.
>
> The only other case I could think of was, if for some reason CDM was
> used by some other interface such as WB, then hw_cdm will not be assigned.
>
> But, I think even for that msm_dp_needs_periph_flush() will take care of
> it because we use the cached_mode which is assigned only in mode_set().
>
> >> + msm_dp_needs_periph_flush(priv->dp[disp_info->h_tile_instance[0]], mode);
> >> +}
> >>
> >> bool dpu_encoder_is_widebus_enabled(const struct drm_encoder *drm_enc)
> >> {
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >> index f43d57d9c74e1..211a3d90eb690 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >> @@ -341,6 +341,19 @@ static inline enum dpu_3d_blend_mode dpu_encoder_helper_get_3d_blend_mode(
> >> */
> >> unsigned int dpu_encoder_helper_get_dsc(struct dpu_encoder_phys *phys_enc);
> >>
> >> +/**
> >> + * dpu_encoder_get_drm_fmt - return DRM fourcc format
> >> + * @phys_enc: Pointer to physical encoder structure
> >> + */
> >> +u32 dpu_encoder_get_drm_fmt(struct dpu_encoder_phys *phys_enc);
> >> +
> >> +/**
> >> + * dpu_encoder_needs_periph_flush - return true if physical encoder requires
> >> + * peripheral flush
> >> + * @phys_enc: Pointer to physical encoder structure
> >> + */
> >> +bool dpu_encoder_needs_periph_flush(struct dpu_encoder_phys *phys_enc);
> >> +
> >> /**
> >> * dpu_encoder_helper_split_config - split display configuration helper function
> >> * This helper function may be used by physical encoders to configure
> >> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> >> index f562beb6f7971..3f102b2813ca8 100644
> >> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> >> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_vid.c
> >> @@ -413,8 +413,15 @@ static int dpu_encoder_phys_vid_control_vblank_irq(
> >> static void dpu_encoder_phys_vid_enable(struct dpu_encoder_phys *phys_enc)
> >> {
> >> struct dpu_hw_ctl *ctl;
> >> + struct dpu_hw_cdm *hw_cdm;
> >> + const struct dpu_format *fmt = NULL;
> >> + u32 fmt_fourcc = DRM_FORMAT_RGB888;
> >>
> >> ctl = phys_enc->hw_ctl;
> >> + hw_cdm = phys_enc->hw_cdm;
> >> + if (hw_cdm)
> >> + fmt_fourcc = dpu_encoder_get_drm_fmt(phys_enc);
> >
> > Please move if(hw_cdm) inside dpu_encoder_get_drm_fmt().
> >
>
> I think we dont need to check for if (hw_cdm) at all.
> dpu_encoder_get_drm_fmt() was just supposed to be a helper which returns
> the fourcc code based on the mode. It doesnt need to know if there is
> cdm or not.
>
> We cannot move it inside dpu_encoder_helper_phys_setup_cdm() because for
> WB, we do not change the fourcc based on the mode. Its specific to video
> mode.
Wait... In the case of the WB we use the fourcc + modifier from the
framebuffer. Ok, this looks fine then.
>
> >> + fmt = dpu_get_dpu_format(fmt_fourcc);
> >
> > Can this be moved into dpu_encoder_helper_phys_setup_cdm() ? Or maybe
> > we can move both calls into the helper? I mean, fmt_fourcc is not used
> > at all if the CDM is not used.
> >
>
> fourcc is always used to get the fmt to setup the timing engine params.
> Its just that it was always hard-coded to RGB. With CDM, it can change
> based on the mode. Thats why this utility was introduced to return the
> fourcc from the mode information.
Yes, I perfectly understand that. I just disliked the idea of calling
dpu_get_dpu_format() if the result gets unused.
What about passing fourcc + modifier to
dpu_encoder_helper_phys_setup_cdm() instead?
>
> >>
> >> DPU_DEBUG_VIDENC(phys_enc, "\n");
> >>
> >> @@ -423,6 +430,8 @@ static void dpu_encoder_phys_vid_enable(struct dpu_encoder_phys *phys_enc)
> >>
> >> dpu_encoder_helper_split_config(phys_enc, phys_enc->hw_intf->idx);
> >>
> >> + dpu_encoder_helper_phys_setup_cdm(phys_enc, fmt, CDM_CDWN_OUTPUT_HDMI);
> >> +
> >> dpu_encoder_phys_vid_setup_timing_engine(phys_enc);
> >>
> >> /*
> >> @@ -438,6 +447,16 @@ static void dpu_encoder_phys_vid_enable(struct dpu_encoder_phys *phys_enc)
> >> if (ctl->ops.update_pending_flush_merge_3d && phys_enc->hw_pp->merge_3d)
> >> ctl->ops.update_pending_flush_merge_3d(ctl, phys_enc->hw_pp->merge_3d->idx);
> >>
> >> + if (ctl->ops.update_pending_flush_cdm && phys_enc->hw_cdm)
> >> + ctl->ops.update_pending_flush_cdm(ctl, hw_cdm->idx);
> >> +
> >> + /*
> >> + * Peripheral flush must be updated whenever flushing SDP packets is needed.
> >> + * SDP packets are required for any YUV format (YUV420, YUV422, YUV444).
> >> + */
> >> + if (ctl->ops.update_pending_flush_periph && dpu_encoder_needs_periph_flush(phys_enc))
> >> + ctl->ops.update_pending_flush_periph(ctl, phys_enc->hw_intf->idx);
> >> +
> >> skip_flush:
> >> DPU_DEBUG_VIDENC(phys_enc,
> >> "update pending flush ctl %d intf %d\n",
> >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> >> index 4b04388719363..ebcc76ef1d590 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> >> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> >> @@ -1397,6 +1397,24 @@ void __exit msm_dp_unregister(void)
> >> platform_driver_unregister(&dp_display_driver);
> >> }
> >>
> >> +bool msm_dp_is_yuv_420_enabled(const struct msm_dp *dp_display,
> >> + const struct drm_display_mode *mode)
> >> +{
> >> + struct dp_display_private *dp;
> >> + const struct drm_display_info *info;
> >> +
> >> + dp = container_of(dp_display, struct dp_display_private, dp_display);
> >> + info = &dp_display->connector->display_info;
> >> +
> >> + return dp->panel->vsc_sdp_supported && drm_mode_is_420_only(info, mode);
> >> +}
> >> +
> >> +bool msm_dp_needs_periph_flush(const struct msm_dp *dp_display,
> >> + const struct drm_display_mode *mode)
> >> +{
> >> + return msm_dp_is_yuv_420_enabled(dp_display, mode);
> >> +}
> >> +
> >> bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
> >> {
> >> struct dp_display_private *dp;
> >> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> >> index 16a7cbc0b7dd8..b876ebd48effe 100644
> >> --- a/drivers/gpu/drm/msm/msm_drv.h
> >> +++ b/drivers/gpu/drm/msm/msm_drv.h
> >> @@ -387,7 +387,10 @@ void __exit msm_dp_unregister(void);
> >> int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
> >> struct drm_encoder *encoder);
> >> void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display);
> >> -
> >> +bool msm_dp_is_yuv_420_enabled(const struct msm_dp *dp_display,
> >> + const struct drm_display_mode *mode);
> >> +bool msm_dp_needs_periph_flush(const struct msm_dp *dp_display,
> >> + const struct drm_display_mode *mode);
> >> bool msm_dp_wide_bus_available(const struct msm_dp *dp_display);
> >>
> >> #else
> >> @@ -409,6 +412,18 @@ static inline void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm
> >> {
> >> }
> >>
> >> +static inline bool msm_dp_is_yuv_420_enabled(const struct msm_dp *dp_display,
> >> + const struct drm_display_mode *mode)
> >> +{
> >> + return false;
> >> +}
> >> +
> >> +static inline bool msm_dp_needs_periph_flush(const struct msm_dp *dp_display,
> >> + const struct drm_display_mode *mode)
> >> +{
> >> + return false;
> >> +}
> >> +
> >> static inline bool msm_dp_wide_bus_available(const struct msm_dp *dp_display)
> >> {
> >> return false;
> >> --
> >> 2.39.2
> >>
> >
> >
--
With best wishes
Dmitry
More information about the Freedreno
mailing list