8480adacfd
Dynamically assign a right mixer to mdp5_crtc_state in the CRTC's atomic_check path. Assigning the right mixer has some constraints, i.e, only a few LMs can be paired together. Update mdp5_mixer_assign to handle these constraints. Firstly, we need to identify whether we need a right mixer or not. At the moment, there are 2 scenarios where a right mixer might be needed: - If any of the planes connected to this CRTC is too wide (i.e, is comprised of 2 hwpipes). - If the CRTC's mode itself is too wide (i.e, a 4K mode on HDMI). We implement both these checks in the mdp5_crtc_atomic_check(), and pass 'need_right_mixer' to mdp5_setup_pipeline. If a CRTC is already assigned a single mixer, and a new atomic commit brings in a drm_plane that needs 2 hwpipes, we can successfully commit this mode without requiring a full modeset, provided that we still use the previously assigned mixer as the left mixer. If such an assignment isn't possible, we'd need to do a full modeset. This scenario has been ignored for now. The mixer assignment code is a bit messy, considering we have at most 4 LM instances in hardware. This can probably be re-visited later with simplified logic. Signed-off-by: Archit Taneja <architt@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com>
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/*
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* Copyright (C) 2017 The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __MDP5_LM_H__
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#define __MDP5_LM_H__
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/* represents a hw Layer Mixer, one (or more) is dynamically assigned to a crtc */
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struct mdp5_hw_mixer {
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int idx;
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const char *name;
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int lm; /* the LM instance # */
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uint32_t caps;
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int pp;
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int dspp;
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uint32_t flush_mask; /* used to commit LM registers */
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};
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/* global atomic state of assignment between CRTCs and Layer Mixers: */
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struct mdp5_hw_mixer_state {
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struct drm_crtc *hwmixer_to_crtc[8];
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};
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struct mdp5_hw_mixer *mdp5_mixer_init(const struct mdp5_lm_instance *lm);
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void mdp5_mixer_destroy(struct mdp5_hw_mixer *lm);
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int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
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uint32_t caps, struct mdp5_hw_mixer **mixer,
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struct mdp5_hw_mixer **r_mixer);
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void mdp5_mixer_release(struct drm_atomic_state *s,
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struct mdp5_hw_mixer *mixer);
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#endif /* __MDP5_LM_H__ */
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