Re: [PATCH] drm/msm/mdp5: handle non-fullscreen base plane case

[Archit Taneja <architt@codeaurora.org>]

On 10/13/2016 10:18 PM, Rob Clark wrote:
> If the bottom-most layer is not fullscreen, we need to use the BASE
> mixer stage for solid fill (ie. MDP5_CTL_BLEND_OP_FLAG_BORDER_OUT).  The
> blend_setup() code pretty much handled this already, we just had to
> figure this out in _atomic_check() and assign the stages appropriately.
>
> Signed-off-by: Rob Clark <robdclark@gmail.com>
> ---
> TODO mdp4 might need similar treatment?
>
>  drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c | 44 ++++++++++++++++++++------------
>  1 file changed, 27 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
> index fa2be7c..e42f62d 100644
> --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
> +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_crtc.c
> @@ -223,11 +223,6 @@ static void blend_setup(struct drm_crtc *crtc)
>  		plane_cnt++;
>  	}
>
> -	/*
> -	* If there is no base layer, enable border color.
> -	* Although it's not possbile in current blend logic,
> -	* put it here as a reminder.
> -	*/
>  	if (!pstates[STAGE_BASE] && plane_cnt) {
>  		ctl_blend_flags |= MDP5_CTL_BLEND_OP_FLAG_BORDER_OUT;
>  		DBG("Border Color is enabled");
> @@ -365,6 +360,15 @@ static int pstate_cmp(const void *a, const void *b)
>  	return pa->state->zpos - pb->state->zpos;
>  }
>
> +/* is there a helper for this? */
> +static bool is_fullscreen(struct drm_crtc_state *cstate,
> +		struct drm_plane_state *pstate)
> +{
> +	return (pstate->crtc_x == 0) && (pstate->crtc_y == 0) &&
> +		(pstate->crtc_w == cstate->mode.hdisplay) &&
> +		(pstate->crtc_h == cstate->mode.vdisplay);
> +}
> +
>  static int mdp5_crtc_atomic_check(struct drm_crtc *crtc,
>  		struct drm_crtc_state *state)
>  {
> @@ -375,21 +379,11 @@ static int mdp5_crtc_atomic_check(struct drm_crtc *crtc,
>  	struct plane_state pstates[STAGE_MAX + 1];
>  	const struct mdp5_cfg_hw *hw_cfg;
>  	const struct drm_plane_state *pstate;
> -	int cnt = 0, i;
> +	int cnt = 0, base = 0, i;
>
>  	DBG("%s: check", mdp5_crtc->name);
>
> -	/* verify that there are not too many planes attached to crtc
> -	 * and that we don't have conflicting mixer stages:
> -	 */
> -	hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);
>  	drm_atomic_crtc_state_for_each_plane_state(plane, pstate, state) {
> -		if (cnt >= (hw_cfg->lm.nb_stages)) {
> -			dev_err(dev->dev, "too many planes!\n");
> -			return -EINVAL;
> -		}
> -
> -
>  		pstates[cnt].plane = plane;
>  		pstates[cnt].state = to_mdp5_plane_state(pstate);
>
> @@ -399,8 +393,24 @@ static int mdp5_crtc_atomic_check(struct drm_crtc *crtc,
>  	/* assign a stage based on sorted zpos property */
>  	sort(pstates, cnt, sizeof(pstates[0]), pstate_cmp, NULL);
>
> +	/* if the bottom-most layer is not fullscreen, we need to use
> +	 * it for solid-color:
> +	 */
> +	if (!is_fullscreen(state, &pstates[0].state->base))
> +		base++;
> +

I get a crash here when fbcon is enabled and there are no connectors
connected. We're trying to refer pstates[0] when there is no plane
connected to the crtc. I guess we could bail out much earlier if cnt
is 0.

Archit

> +	/* verify that there are not too many planes attached to crtc
> +	 * and that we don't have conflicting mixer stages:
> +	 */
> +	hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);
> +
> +	if ((cnt + base) >= hw_cfg->lm.nb_stages) {
> +		dev_err(dev->dev, "too many planes!\n");
> +		return -EINVAL;
> +	}
> +
>  	for (i = 0; i < cnt; i++) {
> -		pstates[i].state->stage = STAGE_BASE + i;
> +		pstates[i].state->stage = STAGE_BASE + i + base;
>  		DBG("%s: assign pipe %s on stage=%d", mdp5_crtc->name,
>  				pipe2name(mdp5_plane_pipe(pstates[i].plane)),
>  				pstates[i].state->stage);
>

-- 
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