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/*
* Copyright (C) 2017 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mdp5_kms.h"
/*
* As of now, there are only 2 combinations possible for source split:
*
* Left | Right
* -----|------
* LM0 | LM1
* LM2 | LM5
*
*/
static int lm_right_pair[] = { 1, -1, 5, -1, -1, -1 };
static int get_right_pair_idx(struct mdp5_kms *mdp5_kms, int lm)
{
int i;
int pair_lm;
pair_lm = lm_right_pair[lm];
if (pair_lm < 0)
return -EINVAL;
for (i = 0; i < mdp5_kms->num_hwmixers; i++) {
struct mdp5_hw_mixer *mixer = mdp5_kms->hwmixers[i];
if (mixer->lm == pair_lm)
return mixer->idx;
}
return -1;
}
int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
uint32_t caps, struct mdp5_hw_mixer **mixer,
struct mdp5_hw_mixer **r_mixer)
{
struct msm_drm_private *priv = s->dev->dev_private;
struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
struct mdp5_global_state *global_state = mdp5_get_global_state(s);
struct mdp5_hw_mixer_state *new_state;
int i;
if (IS_ERR(global_state))
return PTR_ERR(global_state);
new_state = &global_state->hwmixer;
for (i = 0; i < mdp5_kms->num_hwmixers; i++) {
struct mdp5_hw_mixer *cur = mdp5_kms->hwmixers[i];
/*
* skip if already in-use by a different CRTC. If there is a
* mixer already assigned to this CRTC, it means this call is
* a request to get an additional right mixer. Assume that the
* existing mixer is the 'left' one, and try to see if we can
* get its corresponding 'right' pair.
*/
if (new_state->hwmixer_to_crtc[cur->idx] &&
new_state->hwmixer_to_crtc[cur->idx] != crtc)
continue;
/* skip if doesn't support some required caps: */
if (caps & ~cur->caps)
continue;
if (r_mixer) {
int pair_idx;
pair_idx = get_right_pair_idx(mdp5_kms, cur->lm);
if (pair_idx < 0)
return -EINVAL;
if (new_state->hwmixer_to_crtc[pair_idx])
continue;
*r_mixer = mdp5_kms->hwmixers[pair_idx];
}
/*
* prefer a pair-able LM over an unpairable one. We can
* switch the CRTC from Normal mode to Source Split mode
* without requiring a full modeset if we had already
* assigned this CRTC a pair-able LM.
*
* TODO: There will be assignment sequences which would
* result in the CRTC requiring a full modeset, even
* if we have the LM resources to prevent it. For a platform
* with a few displays, we don't run out of pair-able LMs
* so easily. For now, ignore the possibility of requiring
* a full modeset.
*/
if (!(*mixer) || cur->caps & MDP_LM_CAP_PAIR)
*mixer = cur;
}
if (!(*mixer))
return -ENOMEM;
if (r_mixer && !(*r_mixer))
return -ENOMEM;
DBG("assigning Layer Mixer %d to crtc %s", (*mixer)->lm, crtc->name);
new_state->hwmixer_to_crtc[(*mixer)->idx] = crtc;
if (r_mixer) {
DBG("assigning Right Layer Mixer %d to crtc %s", (*r_mixer)->lm,
crtc->name);
new_state->hwmixer_to_crtc[(*r_mixer)->idx] = crtc;
}
return 0;
}
void mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
{
struct mdp5_global_state *global_state = mdp5_get_global_state(s);
struct mdp5_hw_mixer_state *new_state = &global_state->hwmixer;
if (!mixer)
return;
if (WARN_ON(!new_state->hwmixer_to_crtc[mixer->idx]))
return;
DBG("%s: release from crtc %s", mixer->name,
new_state->hwmixer_to_crtc[mixer->idx]->name);
new_state->hwmixer_to_crtc[mixer->idx] = NULL;
}
void mdp5_mixer_destroy(struct mdp5_hw_mixer *mixer)
{
kfree(mixer);
}
static const char * const mixer_names[] = {
"LM0", "LM1", "LM2", "LM3", "LM4", "LM5",
};
struct mdp5_hw_mixer *mdp5_mixer_init(const struct mdp5_lm_instance *lm)
{
struct mdp5_hw_mixer *mixer;
mixer = kzalloc(sizeof(*mixer), GFP_KERNEL);
if (!mixer)
return ERR_PTR(-ENOMEM);
mixer->name = mixer_names[lm->id];
mixer->lm = lm->id;
mixer->caps = lm->caps;
mixer->pp = lm->pp;
mixer->dspp = lm->dspp;
mixer->flush_mask = mdp_ctl_flush_mask_lm(lm->id);
return mixer;
}
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