drm/msm/mdp5: Add structs for hw Layer Mixers

Create a struct to represent MDP5 Layer Mixer instances. This will
eventually allow us to detach CRTCs from the Layer Mixers, and
generally clean things up a bit.

This is very similar to how hwpipes were previously abstracted away
from drm planes.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/Makefile

@@ -40,6 +40,7 @@ msm-y := \
 	mdp/mdp5/mdp5_mdss.o \
 	mdp/mdp5/mdp5_kms.o \
 	mdp/mdp5/mdp5_pipe.o \
+	mdp/mdp5/mdp5_mixer.o \
 	mdp/mdp5/mdp5_plane.o \
 	mdp/mdp5/mdp5_smp.o \
 	msm_atomic.o \

drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c

@@ -165,6 +165,9 @@ static void mdp5_kms_destroy(struct msm_kms *kms)
 	struct msm_gem_address_space *aspace = mdp5_kms->aspace;
 	int i;
 
+	for (i = 0; i < mdp5_kms->num_hwmixers; i++)
+		mdp5_mixer_destroy(mdp5_kms->hwmixers[i]);
+
 	for (i = 0; i < mdp5_kms->num_hwpipes; i++)
 		mdp5_pipe_destroy(mdp5_kms->hwpipes[i]);
 
@@ -829,6 +832,32 @@ static int hwpipe_init(struct mdp5_kms *mdp5_kms)
 	return 0;
 }
 
+static int hwmixer_init(struct mdp5_kms *mdp5_kms)
+{
+	struct drm_device *dev = mdp5_kms->dev;
+	const struct mdp5_cfg_hw *hw_cfg;
+	int i, ret;
+
+	hw_cfg = mdp5_cfg_get_hw_config(mdp5_kms->cfg);
+
+	for (i = 0; i < hw_cfg->lm.count; i++) {
+		struct mdp5_hw_mixer *mixer;
+
+		mixer = mdp5_mixer_init(&hw_cfg->lm.instances[i]);
+		if (IS_ERR(mixer)) {
+			ret = PTR_ERR(mixer);
+			dev_err(dev->dev, "failed to construct LM%d (%d)\n",
+				i, ret);
+			return ret;
+		}
+
+		mixer->idx = mdp5_kms->num_hwmixers;
+		mdp5_kms->hwmixers[mdp5_kms->num_hwmixers++] = mixer;
+	}
+
+	return 0;
+}
+
 static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
@@ -929,6 +958,10 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 	if (ret)
 		goto fail;
 
+	ret = hwmixer_init(mdp5_kms);
+	if (ret)
+		goto fail;
+
 	/* set uninit-ed kms */
 	priv->kms = &mdp5_kms->base.base;
 

drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h

@@ -25,6 +25,7 @@
 #include "mdp5.xml.h"
 #include "mdp5_ctl.h"
 #include "mdp5_pipe.h"
+#include "mdp5_mixer.h"
 #include "mdp5_smp.h"
 
 struct mdp5_state;
@@ -39,6 +40,9 @@ struct mdp5_kms {
 	unsigned num_hwpipes;
 	struct mdp5_hw_pipe *hwpipes[SSPP_MAX];
 
+	unsigned num_hwmixers;
+	struct mdp5_hw_mixer *hwmixers[8];
+
 	struct mdp5_cfg_handler *cfg;
 	uint32_t caps;	/* MDP capabilities (MDP_CAP_XXX bits) */
 

drivers/gpu/drm/msm/mdp/mdp5/mdp5_mixer.c

@@ -0,0 +1,44 @@
+/*
+ * 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"
+
+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;
+}

drivers/gpu/drm/msm/mdp/mdp5/mdp5_mixer.h

@@ -0,0 +1,37 @@
+/*
+ * 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/>.
+ */
+
+#ifndef __MDP5_LM_H__
+#define __MDP5_LM_H__
+
+/* represents a hw Layer Mixer, one (or more) is dynamically assigned to a crtc */
+struct mdp5_hw_mixer {
+	int idx;
+
+	const char *name;
+
+	int lm;			/* the LM instance # */
+	uint32_t caps;
+	int pp;
+	int dspp;
+
+	uint32_t flush_mask;      /* used to commit LM registers */
+};
+
+struct mdp5_hw_mixer *mdp5_mixer_init(const struct mdp5_lm_instance *lm);
+void mdp5_mixer_destroy(struct mdp5_hw_mixer *lm);
+
+#endif /* __MDP5_LM_H__ */