drm/komeda: Add komeda_framebuffer

komeda_framebuffer is for extending drm_framebuffer to add komeda own
attributes and komeda specific fb handling.

Changes in v3:
- Fixed style problem found by checkpatch.pl --strict.

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

drivers/gpu/drm/arm/display/komeda/Makefile

@@ -8,7 +8,8 @@ komeda-y := \
 	komeda_drv.o \
 	komeda_dev.o \
 	komeda_format_caps.o \
-	komeda_pipeline.o
+	komeda_pipeline.o \
+	komeda_framebuffer.o
 
 komeda-y += \
 	d71/d71_dev.o

drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c

@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include <drm/drm_gem.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include "komeda_framebuffer.h"
+#include "komeda_dev.h"
+
+static void komeda_fb_destroy(struct drm_framebuffer *fb)
+{
+	struct komeda_fb *kfb = to_kfb(fb);
+	u32 i;
+
+	for (i = 0; i < fb->format->num_planes; i++)
+		drm_gem_object_put_unlocked(fb->obj[i]);
+
+	drm_framebuffer_cleanup(fb);
+	kfree(kfb);
+}
+
+static int komeda_fb_create_handle(struct drm_framebuffer *fb,
+				   struct drm_file *file, u32 *handle)
+{
+	return drm_gem_handle_create(file, fb->obj[0], handle);
+}
+
+static const struct drm_framebuffer_funcs komeda_fb_funcs = {
+	.destroy	= komeda_fb_destroy,
+	.create_handle	= komeda_fb_create_handle,
+};
+
+static int
+komeda_fb_none_afbc_size_check(struct komeda_dev *mdev, struct komeda_fb *kfb,
+			       struct drm_file *file,
+			       const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct drm_framebuffer *fb = &kfb->base;
+	struct drm_gem_object *obj;
+	u32 min_size = 0;
+	u32 i;
+
+	for (i = 0; i < fb->format->num_planes; i++) {
+		obj = drm_gem_object_lookup(file, mode_cmd->handles[i]);
+		if (!obj) {
+			DRM_DEBUG_KMS("Failed to lookup GEM object\n");
+			fb->obj[i] = NULL;
+
+			return -ENOENT;
+		}
+
+		kfb->aligned_w = fb->width / (i ? fb->format->hsub : 1);
+		kfb->aligned_h = fb->height / (i ? fb->format->vsub : 1);
+
+		if (fb->pitches[i] % mdev->chip.bus_width) {
+			DRM_DEBUG_KMS("Pitch[%d]: 0x%x doesn't align to 0x%x\n",
+				      i, fb->pitches[i], mdev->chip.bus_width);
+			drm_gem_object_put_unlocked(obj);
+			fb->obj[i] = NULL;
+
+			return -EINVAL;
+		}
+
+		min_size = ((kfb->aligned_h / kfb->format_caps->tile_size - 1)
+			    * fb->pitches[i])
+			    + (kfb->aligned_w * fb->format->cpp[i]
+			       * kfb->format_caps->tile_size)
+			    + fb->offsets[i];
+
+		if (obj->size < min_size) {
+			DRM_DEBUG_KMS("Fail to check none afbc fb size.\n");
+			drm_gem_object_put_unlocked(obj);
+			fb->obj[i] = NULL;
+
+			return -EINVAL;
+		}
+
+		fb->obj[i] = obj;
+	}
+
+	if (fb->format->num_planes == 3) {
+		if (fb->pitches[1] != fb->pitches[2]) {
+			DRM_DEBUG_KMS("The pitch[1] and [2] are not same\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+struct drm_framebuffer *
+komeda_fb_create(struct drm_device *dev, struct drm_file *file,
+		 const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct komeda_dev *mdev = dev->dev_private;
+	struct komeda_fb *kfb;
+	int ret = 0, i;
+
+	kfb = kzalloc(sizeof(*kfb), GFP_KERNEL);
+	if (!kfb)
+		return ERR_PTR(-ENOMEM);
+
+	kfb->format_caps = komeda_get_format_caps(&mdev->fmt_tbl,
+						  mode_cmd->pixel_format,
+						  mode_cmd->modifier[0]);
+	if (!kfb->format_caps) {
+		DRM_DEBUG_KMS("FMT %x is not supported.\n",
+			      mode_cmd->pixel_format);
+		kfree(kfb);
+		return ERR_PTR(-EINVAL);
+	}
+
+	drm_helper_mode_fill_fb_struct(dev, &kfb->base, mode_cmd);
+
+	ret = komeda_fb_none_afbc_size_check(mdev, kfb, file, mode_cmd);
+	if (ret < 0)
+		goto err_cleanup;
+
+	ret = drm_framebuffer_init(dev, &kfb->base, &komeda_fb_funcs);
+	if (ret < 0) {
+		DRM_DEBUG_KMS("failed to initialize fb\n");
+
+		goto err_cleanup;
+	}
+
+	return &kfb->base;
+
+err_cleanup:
+	for (i = 0; i < kfb->base.format->num_planes; i++)
+		drm_gem_object_put_unlocked(kfb->base.obj[i]);
+
+	kfree(kfb);
+	return ERR_PTR(ret);
+}
+
+dma_addr_t
+komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane)
+{
+	struct drm_framebuffer *fb = &kfb->base;
+	const struct drm_gem_cma_object *obj;
+	u32 plane_x, plane_y, cpp, pitch, offset;
+
+	if (plane > fb->format->num_planes) {
+		DRM_DEBUG_KMS("Out of max plane num.\n");
+		return -EINVAL;
+	}
+
+	obj = drm_fb_cma_get_gem_obj(fb, plane);
+
+	offset = fb->offsets[plane];
+	if (!fb->modifier) {
+		plane_x = x / (plane ? fb->format->hsub : 1);
+		plane_y = y / (plane ? fb->format->vsub : 1);
+		cpp = fb->format->cpp[plane];
+		pitch = fb->pitches[plane];
+		offset += plane_x * cpp *  kfb->format_caps->tile_size +
+				(plane_y * pitch) / kfb->format_caps->tile_size;
+	}
+
+	return obj->paddr + offset;
+}

drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.h

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#ifndef _KOMEDA_FRAMEBUFFER_H_
+#define _KOMEDA_FRAMEBUFFER_H_
+
+#include <drm/drm_framebuffer.h>
+#include "komeda_format_caps.h"
+
+/** struct komeda_fb - entend drm_framebuffer with komeda attribute */
+struct komeda_fb {
+	/** @base: &drm_framebuffer */
+	struct drm_framebuffer base;
+	/* @format_caps: &komeda_format_caps */
+	const struct komeda_format_caps *format_caps;
+	/** @aligned_w: aligned frame buffer width */
+	u32 aligned_w;
+	/** @aligned_h: aligned frame buffer height */
+	u32 aligned_h;
+};
+
+#define to_kfb(dfb)	container_of(dfb, struct komeda_fb, base)
+
+struct drm_framebuffer *
+komeda_fb_create(struct drm_device *dev, struct drm_file *file,
+		 const struct drm_mode_fb_cmd2 *mode_cmd);
+dma_addr_t
+komeda_fb_get_pixel_addr(struct komeda_fb *kfb, int x, int y, int plane);
+bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type);
+
+#endif