[RFC 1/4] drm/msm/dpu: introduce a wb_idx to be used for writeback interfaces
Dmitry Baryshkov
dmitry.baryshkov at linaro.org
Fri Apr 22 10:37:32 UTC 2022
On Fri, 22 Apr 2022 at 04:59, Abhinav Kumar <quic_abhinavk at quicinc.com> wrote:
>
>
>
> On 4/21/2022 5:22 PM, Dmitry Baryshkov wrote:
> > On Fri, 22 Apr 2022 at 02:07, Abhinav Kumar <quic_abhinavk at quicinc.com> wrote:
> >>
> >> Hi Dmitry
> >>
> >> Thanks for the review.
> >>
> >> One question below.
> >>
> >> On 4/21/2022 3:40 PM, Dmitry Baryshkov wrote:
> >>> On 21/04/2022 23:48, Abhinav Kumar wrote:
> >>>> Using intf_idx even for writeback interfaces is confusing
> >>>> because intf_idx is of type enum dpu_intf but the index used
> >>>> for writeback is of type enum dpu_wb.
> >>>>
> >>>> In addition, this makes it easier to separately check the
> >>>> availability of the two as its possible that there are boards
> >>>> which don't have any physical display connected but can still
> >>>> work in writeback mode.
> >>>>
> >>>> Signed-off-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
> >>>
> >>> Looks good, two minor issues bellow.
> >>>
> >>> With them fixed, I'd even squash this patch into the corresponding patch
> >>> of the previous patchset.
> >>>
> >>>> ---
> >>>> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 62
> >>>> +++++++++++++-----------
> >>>> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h | 4 ++
> >>>> drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h | 2 +-
> >>>> 3 files changed, 40 insertions(+), 28 deletions(-)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >>>> index 9c12841..054d7e4 100644
> >>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> >>>> @@ -962,7 +962,6 @@ static void
> >>>> dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
> >>>> struct dpu_hw_blk *hw_dsc[MAX_CHANNELS_PER_ENC];
> >>>> int num_lm, num_ctl, num_pp, num_dsc;
> >>>> unsigned int dsc_mask = 0;
> >>>> - enum dpu_hw_blk_type blk_type;
> >>>> int i;
> >>>> if (!drm_enc) {
> >>>> @@ -1044,17 +1043,11 @@ static void
> >>>> dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
> >>>> phys->hw_pp = dpu_enc->hw_pp[i];
> >>>> phys->hw_ctl = to_dpu_hw_ctl(hw_ctl[i]);
> >>>> - if (dpu_encoder_get_intf_mode(&dpu_enc->base) ==
> >>>> INTF_MODE_WB_LINE)
> >>>> - blk_type = DPU_HW_BLK_WB;
> >>>> - else
> >>>> - blk_type = DPU_HW_BLK_INTF;
> >>>> + if (phys->intf_idx >= INTF_0 && phys->intf_idx < INTF_MAX)
> >>>> + phys->hw_intf = dpu_rm_get_intf(&dpu_kms->rm,
> >>>> phys->intf_idx);
> >>>> - if (phys->intf_idx >= INTF_0 && phys->intf_idx < INTF_MAX) {
> >>>> - if (blk_type == DPU_HW_BLK_INTF)
> >>>> - phys->hw_intf = dpu_rm_get_intf(&dpu_kms->rm,
> >>>> phys->intf_idx);
> >>>> - else if (blk_type == DPU_HW_BLK_WB)
> >>>> - phys->hw_wb = dpu_rm_get_wb(&dpu_kms->rm,
> >>>> phys->intf_idx);
> >>>> - }
> >>>> + if (phys->wb_idx >= WB_0 && phys->wb_idx < WB_MAX)
> >>>> + phys->hw_wb = dpu_rm_get_wb(&dpu_kms->rm, phys->wb_idx);
> >>>
> >>> We also need a check for if (phus->hw_intf && phys->hw_wb) HERE
> >>
> >> So there is an error if
> >>
> >> 1) Neither wb NOR intf are present
> >> 2) Both wb AND intf are present for the physical encoder?
> >>
> >> The second check is okay for now to add but considering concurrent
> >> writeback then that wouldn't assumption be wrong since both physical and
> >> wb interfaces can go with the same encoder?
> >
> > To the same encoder, but not to the same physical encoder. Here we
> > check the phys_enc parameters.
>
> Ok got it, let me re-spin this RFC with patches 2 & 3 squashed.
> Get the acks on them.
>
> Then will absorb into WB series and re-post it.
Sounds like a good plan!
>
> >
> >>
> >>>
> >>>> if (!phys->hw_intf && !phys->hw_wb) {
> >>>> DPU_ERROR_ENC(dpu_enc,
> >>>> @@ -1201,7 +1194,7 @@ static void dpu_encoder_virt_disable(struct
> >>>> drm_encoder *drm_enc)
> >>>> mutex_unlock(&dpu_enc->enc_lock);
> >>>> }
> >>>> -static enum dpu_intf dpu_encoder_get_intf_or_wb(struct dpu_mdss_cfg
> >>>> *catalog,
> >>>> +static enum dpu_intf dpu_encoder_get_intf(struct dpu_mdss_cfg *catalog,
> >>>> enum dpu_intf_type type, u32 controller_id)
> >>>> {
> >>>> int i = 0;
> >>>> @@ -1213,16 +1206,28 @@ static enum dpu_intf
> >>>> dpu_encoder_get_intf_or_wb(struct dpu_mdss_cfg *catalog,
> >>>> return catalog->intf[i].id;
> >>>> }
> >>>> }
> >>>> - } else {
> >>>> - for (i = 0; i < catalog->wb_count; i++) {
> >>>> - if (catalog->wb[i].id == controller_id)
> >>>> - return catalog->wb[i].id;
> >>>> - }
> >>>> }
> >>>> return INTF_MAX;
> >>>> }
> >>>> +static enum dpu_wb dpu_encoder_get_wb(struct dpu_mdss_cfg *catalog,
> >>>> + enum dpu_intf_type type, u32 controller_id)
> >>>> +{
> >>>> + int i = 0;
> >>>> +
> >>>> + if (type != INTF_WB)
> >>>> + goto end;
> >>>> +
> >>>> + for (i = 0; i < catalog->wb_count; i++) {
> >>>> + if (catalog->wb[i].id == controller_id)
> >>>> + return catalog->wb[i].id;
> >>>> + }
> >>>> +
> >>>> +end:
> >>>> + return WB_MAX;
> >>>
> >>> I'd return INTF_NONE/WB_NONE if the interface or WB unit was not found.
> >> ack, i guess in that case even the places checking the return value of
> >> this function need to be changed.
> >
> > Yes, of course.
> >
> >>>
> >>>> +}
> >>>> +
> >>>> static void dpu_encoder_vblank_callback(struct drm_encoder *drm_enc,
> >>>> struct dpu_encoder_phys *phy_enc)
> >>>> {
> >>>> @@ -2249,18 +2254,21 @@ static int dpu_encoder_setup_display(struct
> >>>> dpu_encoder_virt *dpu_enc,
> >>>> DPU_DEBUG("h_tile_instance %d = %d, split_role %d\n",
> >>>> i, controller_id, phys_params.split_role);
> >>>> - /*
> >>>> - * FIXME: have separate intf_idx and wb_idx to avoid using
> >>>> - * enum dpu_intf type for wb_idx and also to be able to
> >>>> - * not bail out when there is no intf for boards which dont
> >>>> - * have a display connected to them.
> >>>> - * Having a valid wb_idx but not a intf_idx can be a valid
> >>>> - * combination moving forward.
> >>>> - */
> >>>> - phys_params.intf_idx =
> >>>> dpu_encoder_get_intf_or_wb(dpu_kms->catalog,
> >>>> + phys_params.intf_idx = dpu_encoder_get_intf(dpu_kms->catalog,
> >>>> intf_type,
> >>>> controller_id);
> >>>> - if (phys_params.intf_idx == INTF_MAX) {
> >>>> +
> >>>> + phys_params.wb_idx = dpu_encoder_get_wb(dpu_kms->catalog,
> >>>> + intf_type, controller_id);
> >>>> + /*
> >>>> + * For boards which have no physical displays, having no
> >>>> interface
> >>>> + * is fine because it can still be used with just writeback.
> >>>> + * If we try without a display on a board which uses a DPU in
> >>>> which
> >>>> + * writeback is not supported, then this will still fail as
> >>>> it will not
> >>>> + * find any writeback in the catalog.
> >>>> + */
> >>>> + if ((phys_params.intf_idx == INTF_MAX) &&
> >>>> + (phys_params.wb_idx == WB_MAX)) {
> >>>> DPU_ERROR_ENC(dpu_enc, "could not get intf or wb: type
> >>>> %d, id %d\n",
> >>>> intf_type, controller_id);
> >>>> ret = -EINVAL;
> >>>> 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 04d037e..f2af07d 100644
> >>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys.h
> >>>> @@ -181,6 +181,7 @@ enum dpu_intr_idx {
> >>>> * @split_role: Role to play in a split-panel configuration
> >>>> * @intf_mode: Interface mode
> >>>> * @intf_idx: Interface index on dpu hardware
> >>>> + * @wb_idx: Writeback index on dpu hardware
> >>>> * @enc_spinlock: Virtual-Encoder-Wide Spin Lock for IRQ purposes
> >>>> * @enable_state: Enable state tracking
> >>>> * @vblank_refcount: Reference count of vblank request
> >>>> @@ -209,6 +210,7 @@ struct dpu_encoder_phys {
> >>>> enum dpu_enc_split_role split_role;
> >>>> enum dpu_intf_mode intf_mode;
> >>>> enum dpu_intf intf_idx;
> >>>> + enum dpu_wb wb_idx;
> >>>> spinlock_t *enc_spinlock;
> >>>> enum dpu_enc_enable_state enable_state;
> >>>> atomic_t vblank_refcount;
> >>>> @@ -275,6 +277,7 @@ struct dpu_encoder_phys_cmd {
> >>>> * @parent_ops: Callbacks exposed by the parent to the phys_enc
> >>>> * @split_role: Role to play in a split-panel configuration
> >>>> * @intf_idx: Interface index this phys_enc will control
> >>>> + * @wb_idx: Writeback index this phys_enc will control
> >>>> * @enc_spinlock: Virtual-Encoder-Wide Spin Lock for IRQ purposes
> >>>> */
> >>>> struct dpu_enc_phys_init_params {
> >>>> @@ -283,6 +286,7 @@ struct dpu_enc_phys_init_params {
> >>>> const struct dpu_encoder_virt_ops *parent_ops;
> >>>> enum dpu_enc_split_role split_role;
> >>>> enum dpu_intf intf_idx;
> >>>> + enum dpu_wb wb_idx;
> >>>> spinlock_t *enc_spinlock;
> >>>> };
> >>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> >>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> >>>> index ba82e54..2f34a31 100644
> >>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> >>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.h
> >>>> @@ -103,7 +103,7 @@ static inline struct dpu_hw_intf
> >>>> *dpu_rm_get_intf(struct dpu_rm *rm, enum dpu_in
> >>>> * @rm: DPU Resource Manager handle
> >>>> * @wb_idx: WB index
> >>>> */
> >>>> -static inline struct dpu_hw_wb *dpu_rm_get_wb(struct dpu_rm *rm, enum
> >>>> dpu_intf wb_idx)
> >>>> +static inline struct dpu_hw_wb *dpu_rm_get_wb(struct dpu_rm *rm, enum
> >>>> dpu_wb wb_idx)
> >>>> {
> >>>> return rm->hw_wb[wb_idx - WB_0];
> >>>> }
> >>>
> >>>
> >
> >
> >
--
With best wishes
Dmitry
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