On Thu, 31 Aug 2023 at 01:50, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:
>
> Reserve CDM blocks for writeback if the format of the output fb
> is YUV. At the moment, the reservation is done only for writeback
> but can easily be extended by relaxing the checks once other
> interfaces are ready to output YUV.
>
> Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 35 ++++++++++++++++++++-
> 1 file changed, 34 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 1b1e07292a9e..7a3d179bdfba 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -16,6 +16,7 @@
> #include <drm/drm_crtc.h>
> #include <drm/drm_file.h>
> #include <drm/drm_probe_helper.h>
> +#include <drm/drm_framebuffer.h>
>
> #include "msm_drv.h"
> #include "dpu_kms.h"
> @@ -615,9 +616,11 @@ static int dpu_encoder_virt_atomic_check(
> struct drm_display_mode *adj_mode;
> struct msm_display_topology topology;
> struct dpu_global_state *global_state;
> + struct drm_framebuffer *fb;
> struct drm_dsc_config *dsc;
> int i = 0;
> int ret = 0;
> + bool needs_cdm = false;
>
> if (!drm_enc || !crtc_state || !conn_state) {
> DPU_ERROR("invalid arg(s), drm_enc %d, crtc/conn state %d/%d\n",
> @@ -655,6 +658,22 @@ static int dpu_encoder_virt_atomic_check(
>
> topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode, crtc_state, dsc);
>
> + /*
> + * Use CDM only for writeback at the moment as other interfaces cannot handle it.
> + * if writeback itself cannot handle cdm for some reason it will fail in its atomic_check()
> + * earlier.
> + */
> + if (dpu_enc->disp_info.intf_type == INTF_WB && conn_state->writeback_job) {
> + fb = conn_state->writeback_job->fb;
> +
> + if (fb && DPU_FORMAT_IS_YUV(to_dpu_format(msm_framebuffer_format(fb))))
> + needs_cdm = true;
> + if (needs_cdm && !dpu_enc->cur_master->hw_cdm)
> + crtc_state->mode_changed = true;
> + else if (!needs_cdm && dpu_enc->cur_master->hw_cdm)
> + crtc_state->mode_changed = true;
> + }
What would be the (estimated) check for DP?
> +
> /*
> * Release and Allocate resources on every modeset
> * Dont allocate when active is false.
> @@ -664,7 +683,7 @@ static int dpu_encoder_virt_atomic_check(
>
> if (!crtc_state->active_changed || crtc_state->enable)
> ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
> - drm_enc, crtc_state, topology, false);
> + drm_enc, crtc_state, topology, needs_cdm);
> }
>
> trace_dpu_enc_atomic_check_flags(DRMID(drm_enc), adj_mode->flags);
> @@ -1126,6 +1145,20 @@ static void dpu_encoder_virt_atomic_mode_set(struct drm_encoder *drm_enc,
>
> dpu_enc->dsc_mask = dsc_mask;
>
> + if (dpu_enc->disp_info.intf_type == INTF_WB && conn_state->writeback_job) {
> + struct dpu_hw_blk *hw_cdm = NULL;
> + struct drm_framebuffer *fb;
> +
> + fb = conn_state->writeback_job->fb;
> +
> + if (fb && DPU_FORMAT_IS_YUV(to_dpu_format(msm_framebuffer_format(fb)))) {
You can drop all fb-related conditions here. If we have CDM, we know
that we asked for it. If we do not, it's because we do not need it.
> + dpu_rm_get_assigned_resources(&dpu_kms->rm, global_state,
> + drm_enc->base.id, DPU_HW_BLK_CDM,
> + &hw_cdm, 1);
> + }
> + dpu_enc->cur_master->hw_cdm = hw_cdm ? to_dpu_hw_cdm(hw_cdm) : NULL;
> + }
> +
> cstate = to_dpu_crtc_state(crtc_state);
>
> for (i = 0; i < num_lm; i++) {
> --
> 2.40.1
>
--
With best wishes
Dmitry
