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Message-ID: <CAA8EJpoYTEGwFQXM3QRW6Y8oYXeT1OAR3X=+gJTcLr5e2paUwA@mail.gmail.com>
Date: Wed, 28 Aug 2024 23:54:35 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/12] drm/msm/dpu: split dpu_plane_atomic_check()
On Wed, 28 Aug 2024 at 22:29, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>
>
>
> On 8/28/2024 11:59 AM, Dmitry Baryshkov wrote:
> > On Wed, 28 Aug 2024 at 21:27, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
> >>
> >>
> >>
> >> On 6/26/2024 2:46 PM, Dmitry Baryshkov wrote:
> >>> Split dpu_plane_atomic_check() function into two pieces:
> >>>
> >>> dpu_plane_atomic_check_nopipe() performing generic checks on the pstate,
> >>> without touching the associated pipe,
> >>>
> >>> and
> >>>
> >>> dpu_plane_atomic_check_pipes(), which takes into account used pipes.
> >>>
> >>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> >>> ---
> >>> drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 178 +++++++++++++++++++-----------
> >>> 1 file changed, 112 insertions(+), 66 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> >>> index 115c1bd77bdd..9b9fe28052ad 100644
> >>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> >>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c
> >>> @@ -788,49 +788,22 @@ static int dpu_plane_atomic_check_pipe(struct dpu_plane *pdpu,
> >>> #define MAX_UPSCALE_RATIO 20
> >>> #define MAX_DOWNSCALE_RATIO 4
> >>>
> >>> -static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>> - struct drm_atomic_state *state)
> >>> +static int dpu_plane_atomic_check_nopipe(struct drm_plane *plane,
> >>> + struct drm_plane_state *new_plane_state,
> >>> + const struct drm_crtc_state *crtc_state)
> >>> {
> >>> - struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
> >>> - plane);
> >>> int ret = 0, min_scale, max_scale;
> >>> struct dpu_plane *pdpu = to_dpu_plane(plane);
> >>> struct dpu_kms *kms = _dpu_plane_get_kms(&pdpu->base);
> >>> u64 max_mdp_clk_rate = kms->perf.max_core_clk_rate;
> >>> struct dpu_plane_state *pstate = to_dpu_plane_state(new_plane_state);
> >>> - struct dpu_sw_pipe *pipe = &pstate->pipe;
> >>> - struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
> >>> - const struct drm_crtc_state *crtc_state = NULL;
> >>> - const struct msm_format *fmt;
> >>> struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
> >>> struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
> >>> struct drm_rect fb_rect = { 0 };
> >>> uint32_t max_linewidth;
> >>> - unsigned int rotation;
> >>> - uint32_t supported_rotations;
> >>> - const struct dpu_sspp_cfg *pipe_hw_caps;
> >>> - const struct dpu_sspp_sub_blks *sblk;
> >>> -
> >>> - if (new_plane_state->crtc)
> >>> - crtc_state = drm_atomic_get_new_crtc_state(state,
> >>> - new_plane_state->crtc);
> >>> -
> >>> - pipe->sspp = dpu_rm_get_sspp(&kms->rm, pdpu->pipe);
> >>> - r_pipe->sspp = NULL;
> >>>
> >>> - if (!pipe->sspp)
> >>> - return -EINVAL;
> >>> -
> >>> - pipe_hw_caps = pipe->sspp->cap;
> >>> - sblk = pipe->sspp->cap->sblk;
> >>> -
> >>> - if (sblk->scaler_blk.len) {
> >>> - min_scale = FRAC_16_16(1, MAX_UPSCALE_RATIO);
> >>> - max_scale = MAX_DOWNSCALE_RATIO << 16;
> >>> - } else {
> >>> - min_scale = DRM_PLANE_NO_SCALING;
> >>> - max_scale = DRM_PLANE_NO_SCALING;
> >>> - }
> >>> + min_scale = FRAC_16_16(1, MAX_UPSCALE_RATIO);
> >>> + max_scale = MAX_DOWNSCALE_RATIO << 16;
> >>>
> >>> ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
> >>> min_scale,
> >>> @@ -843,11 +816,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>> if (!new_plane_state->visible)
> >>> return 0;
> >>>
> >>> - pipe->multirect_index = DPU_SSPP_RECT_SOLO;
> >>> - pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> >>> - r_pipe->multirect_index = DPU_SSPP_RECT_SOLO;
> >>> - r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_NONE;
> >>> -
> >>> pstate->stage = DPU_STAGE_0 + pstate->base.normalized_zpos;
> >>> if (pstate->stage >= pdpu->catalog->caps->max_mixer_blendstages) {
> >>> DPU_ERROR("> %d plane stages assigned\n",
> >>> @@ -871,8 +839,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>> return -E2BIG;
> >>> }
> >>>
> >>> - fmt = msm_framebuffer_format(new_plane_state->fb);
> >>> -
> >>> max_linewidth = pdpu->catalog->caps->max_linewidth;
> >>>
> >>> drm_rect_rotate(&pipe_cfg->src_rect,
> >>> @@ -881,6 +847,78 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>>
> >>> if ((drm_rect_width(&pipe_cfg->src_rect) > max_linewidth) ||
> >>> _dpu_plane_calc_clk(&crtc_state->adjusted_mode, pipe_cfg) > max_mdp_clk_rate) {
> >>> + if (drm_rect_width(&pipe_cfg->src_rect) > 2 * max_linewidth) {
> >>> + DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u\n",
> >>> + DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
> >>> + return -E2BIG;
> >>> + }
> >>> +
> >>> + *r_pipe_cfg = *pipe_cfg;
> >>> + pipe_cfg->src_rect.x2 = (pipe_cfg->src_rect.x1 + pipe_cfg->src_rect.x2) >> 1;
> >>> + pipe_cfg->dst_rect.x2 = (pipe_cfg->dst_rect.x1 + pipe_cfg->dst_rect.x2) >> 1;
> >>> + r_pipe_cfg->src_rect.x1 = pipe_cfg->src_rect.x2;
> >>> + r_pipe_cfg->dst_rect.x1 = pipe_cfg->dst_rect.x2;
> >>> + } else {
> >>> + memset(r_pipe_cfg, 0, sizeof(*r_pipe_cfg));
> >>> + }
> >>> +
> >>
> >> This is the part I am not able to fully understand. Assignment of
> >> r_pipe_cfg is also pipe related so why should that move to
> >> dpu_plane_atomic_check_nopipe(). It should be part of
> >> dpu_plane_atomic_check_pipe().
> >
> > Because it happens before possible pipe / rectangle allocation. These
> > values are further used to assign resources.
> >
>
> Are you referring to SSPP allocation which happens in
> dpu_plane_virtual_assign_resources() later on?
>
> I see your point, but thats why originally I wanted to ask whether this
> should be called dpu_plane_atomic_check_nosspp() and
> dpu_plane_atomic_check_sspp() because pipe is kind of assigned either
> here or already assigned. Its the SSPP which is not.
Ack, let's rename it.
>
> >>
> >>> + drm_rect_rotate_inv(&pipe_cfg->src_rect,
> >>> + new_plane_state->fb->width, new_plane_state->fb->height,
> >>> + new_plane_state->rotation);
> >>> + if (r_pipe_cfg->src_rect.x1 != 0)
> >>> + drm_rect_rotate_inv(&r_pipe_cfg->src_rect,
> >>> + new_plane_state->fb->width, new_plane_state->fb->height,
> >>> + new_plane_state->rotation);
> >>> +
> >>> + pstate->needs_qos_remap = drm_atomic_crtc_needs_modeset(crtc_state);
> >>> +
> >>> + return 0;
> >>> +}
> >>> +
> >>> +static int dpu_plane_atomic_check_pipes(struct drm_plane *plane,
> >>> + struct drm_atomic_state *state,
> >>> + const struct drm_crtc_state *crtc_state)
> >>> +{
> >>> + struct drm_plane_state *new_plane_state =
> >>> + drm_atomic_get_new_plane_state(state, plane);
> >>> + struct dpu_plane *pdpu = to_dpu_plane(plane);
> >>> + struct dpu_plane_state *pstate = to_dpu_plane_state(new_plane_state);
> >>> + struct dpu_sw_pipe *pipe = &pstate->pipe;
> >>> + struct dpu_sw_pipe *r_pipe = &pstate->r_pipe;
> >>> + const struct msm_format *fmt;
> >>> + struct dpu_sw_pipe_cfg *pipe_cfg = &pstate->pipe_cfg;
> >>> + struct dpu_sw_pipe_cfg *r_pipe_cfg = &pstate->r_pipe_cfg;
> >>> + uint32_t max_linewidth;
> >>> + unsigned int rotation;
> >>> + uint32_t supported_rotations;
> >>> + const struct dpu_sspp_cfg *pipe_hw_caps;
> >>> + const struct dpu_sspp_sub_blks *sblk;
> >>> + int ret = 0;
> >>> +
> >>> + pipe_hw_caps = pipe->sspp->cap;
> >>> + sblk = pipe->sspp->cap->sblk;
> >>> +
> >>> + /*
> >>> + * We already have verified scaling against platform limitations.
> >>> + * Now check if the SSPP supports scaling at all.
> >>> + */
> >>> + if (!sblk->scaler_blk.len &&
> >>> + ((drm_rect_width(&new_plane_state->src) >> 16 !=
> >>> + drm_rect_width(&new_plane_state->dst)) ||
> >>> + (drm_rect_height(&new_plane_state->src) >> 16 !=
> >>> + drm_rect_height(&new_plane_state->dst))))
> >>> + return -ERANGE;
> >>> +
> >>
> >> Should this part be retained under dpu_plane_atomic_check_nopipe()?
> >>
> >> This is also not pipe dependent.
> >
> > No, it uses sblk->scaler_blk, so it depends on the actual SSPP being
> > used for this pipe.
> >
>
> Ack.
>
> >>
> >>> + fmt = msm_framebuffer_format(new_plane_state->fb);
> >>> +
> >>> + max_linewidth = pdpu->catalog->caps->max_linewidth;
> >>> +
> >>> + ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt,
> >>> + &crtc_state->adjusted_mode);
> >>> + if (ret)
> >>> + return ret;
> >>> +
> >>> + if (drm_rect_width(&r_pipe_cfg->src_rect) != 0) {
> >>> /*
> >>> * In parallel multirect case only the half of the usual width
> >>> * is supported for tiled formats. If we are here, we know that
> >>> @@ -894,12 +932,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>> return -E2BIG;
> >>> }
> >>>
> >>> - if (drm_rect_width(&pipe_cfg->src_rect) > 2 * max_linewidth) {
> >>> - DPU_DEBUG_PLANE(pdpu, "invalid src " DRM_RECT_FMT " line:%u\n",
> >>> - DRM_RECT_ARG(&pipe_cfg->src_rect), max_linewidth);
> >>> - return -E2BIG;
> >>> - }
> >>> -
> >>> if (drm_rect_width(&pipe_cfg->src_rect) != drm_rect_width(&pipe_cfg->dst_rect) ||
> >>> drm_rect_height(&pipe_cfg->src_rect) != drm_rect_height(&pipe_cfg->dst_rect) ||
> >>> (!test_bit(DPU_SSPP_SMART_DMA_V1, &pipe->sspp->cap->features) &&
> >>> @@ -921,26 +953,6 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>> r_pipe->multirect_index = DPU_SSPP_RECT_1;
> >>> r_pipe->multirect_mode = DPU_SSPP_MULTIRECT_PARALLEL;
> >>>
> >>> - *r_pipe_cfg = *pipe_cfg;
> >>> - pipe_cfg->src_rect.x2 = (pipe_cfg->src_rect.x1 + pipe_cfg->src_rect.x2) >> 1;
> >>> - pipe_cfg->dst_rect.x2 = (pipe_cfg->dst_rect.x1 + pipe_cfg->dst_rect.x2) >> 1;
> >>> - r_pipe_cfg->src_rect.x1 = pipe_cfg->src_rect.x2;
> >>> - r_pipe_cfg->dst_rect.x1 = pipe_cfg->dst_rect.x2;
> >>> - }
> >>> -
> >>> - drm_rect_rotate_inv(&pipe_cfg->src_rect,
> >>> - new_plane_state->fb->width, new_plane_state->fb->height,
> >>> - new_plane_state->rotation);
> >>> - if (r_pipe->sspp)
> >>> - drm_rect_rotate_inv(&r_pipe_cfg->src_rect,
> >>> - new_plane_state->fb->width, new_plane_state->fb->height,
> >>> - new_plane_state->rotation);
> >>> -
> >>> - ret = dpu_plane_atomic_check_pipe(pdpu, pipe, pipe_cfg, fmt, &crtc_state->adjusted_mode);
> >>> - if (ret)
> >>> - return ret;
> >>> -
> >>> - if (r_pipe->sspp) {
> >>> ret = dpu_plane_atomic_check_pipe(pdpu, r_pipe, r_pipe_cfg, fmt,
> >>> &crtc_state->adjusted_mode);
> >>> if (ret)
> >>> @@ -963,11 +975,45 @@ static int dpu_plane_atomic_check(struct drm_plane *plane,
> >>> }
> >>>
> >>> pstate->rotation = rotation;
> >>
> >> The dpu_plane_check_inline_rotation() is also pipe independent. So even
> >> that goes to dpu_plane_atomic_check_nopipe()?
> >
> > It also depends on the sblk if I remember correctly. Also note that
> > the next patch moves it to check_pipe().
> >
>
> Ack. I checked the next change. this part is fine.
>
> >>
> >>> - pstate->needs_qos_remap = drm_atomic_crtc_needs_modeset(crtc_state);
> >>>
> >>> return 0;
> >>> }
> >>>
> >>
> >> <snip>
> >>
> >
> >
--
With best wishes
Dmitry
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