1 files changed, 283 insertions, 0 deletions

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
new file mode 100644
index 000000000..170f9dc8e
--- /dev/null
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_framebuffer.c
@@ -0,0 +1,283 @@
+// 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_device.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_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(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_afbc_size_check(struct komeda_fb *kfb, struct drm_file *file,
+			  const struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	struct drm_framebuffer *fb = &kfb->base;
+	const struct drm_format_info *info = fb->format;
+	struct drm_gem_object *obj;
+	u32 alignment_w = 0, alignment_h = 0, alignment_header, n_blocks, bpp;
+	u64 min_size;
+
+	obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
+	if (!obj) {
+		DRM_DEBUG_KMS("Failed to lookup GEM object\n");
+		return -ENOENT;
+	}
+
+	switch (fb->modifier & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) {
+	case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8:
+		alignment_w = 32;
+		alignment_h = 8;
+		break;
+	case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16:
+		alignment_w = 16;
+		alignment_h = 16;
+		break;
+	default:
+		WARN(1, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n",
+		     fb->modifier & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK);
+		break;
+	}
+
+	/* tiled header afbc */
+	if (fb->modifier & AFBC_FORMAT_MOD_TILED) {
+		alignment_w *= AFBC_TH_LAYOUT_ALIGNMENT;
+		alignment_h *= AFBC_TH_LAYOUT_ALIGNMENT;
+		alignment_header = AFBC_TH_BODY_START_ALIGNMENT;
+	} else {
+		alignment_header = AFBC_BODY_START_ALIGNMENT;
+	}
+
+	kfb->aligned_w = ALIGN(fb->width, alignment_w);
+	kfb->aligned_h = ALIGN(fb->height, alignment_h);
+
+	if (fb->offsets[0] % alignment_header) {
+		DRM_DEBUG_KMS("afbc offset alignment check failed.\n");
+		goto check_failed;
+	}
+
+	n_blocks = (kfb->aligned_w * kfb->aligned_h) / AFBC_SUPERBLK_PIXELS;
+	kfb->offset_payload = ALIGN(n_blocks * AFBC_HEADER_SIZE,
+				    alignment_header);
+
+	bpp = komeda_get_afbc_format_bpp(info, fb->modifier);
+	kfb->afbc_size = kfb->offset_payload + n_blocks *
+			 ALIGN(bpp * AFBC_SUPERBLK_PIXELS / 8,
+			       AFBC_SUPERBLK_ALIGNMENT);
+	min_size = kfb->afbc_size + fb->offsets[0];
+	if (min_size > obj->size) {
+		DRM_DEBUG_KMS("afbc size check failed, obj_size: 0x%zx. min_size 0x%llx.\n",
+			      obj->size, min_size);
+		goto check_failed;
+	}
+
+	fb->obj[0] = obj;
+	return 0;
+
+check_failed:
+	drm_gem_object_put(obj);
+	return -EINVAL;
+}
+
+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;
+	const struct drm_format_info *info = fb->format;
+	struct drm_gem_object *obj;
+	u32 i, block_h;
+	u64 min_size;
+
+	if (komeda_fb_check_src_coords(kfb, 0, 0, fb->width, fb->height))
+		return -EINVAL;
+
+	for (i = 0; i < info->num_planes; i++) {
+		obj = drm_gem_object_lookup(file, mode_cmd->handles[i]);
+		if (!obj) {
+			DRM_DEBUG_KMS("Failed to lookup GEM object\n");
+			return -ENOENT;
+		}
+		fb->obj[i] = obj;
+
+		block_h = drm_format_info_block_height(info, i);
+		if ((fb->pitches[i] * block_h) % 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);
+			return -EINVAL;
+		}
+
+		min_size = komeda_fb_get_pixel_addr(kfb, 0, fb->height, i)
+			 - to_drm_gem_cma_obj(obj)->paddr;
+		if (obj->size < min_size) {
+			DRM_DEBUG_KMS("The fb->obj[%d] size: 0x%zx lower than the minimum requirement: 0x%llx.\n",
+				      i, obj->size, min_size);
+			return -EINVAL;
+		}
+	}
+
+	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);
+
+	if (kfb->base.modifier)
+		ret = komeda_fb_afbc_size_check(kfb, file, mode_cmd);
+	else
+		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;
+	}
+
+	kfb->is_va = mdev->iommu ? true : false;
+
+	return &kfb->base;
+
+err_cleanup:
+	for (i = 0; i < kfb->base.format->num_planes; i++)
+		drm_gem_object_put(kfb->base.obj[i]);
+
+	kfree(kfb);
+	return ERR_PTR(ret);
+}
+
+int komeda_fb_check_src_coords(const struct komeda_fb *kfb,
+			       u32 src_x, u32 src_y, u32 src_w, u32 src_h)
+{
+	const struct drm_framebuffer *fb = &kfb->base;
+	const struct drm_format_info *info = fb->format;
+	u32 block_w = drm_format_info_block_width(fb->format, 0);
+	u32 block_h = drm_format_info_block_height(fb->format, 0);
+
+	if ((src_x + src_w > fb->width) || (src_y + src_h > fb->height)) {
+		DRM_DEBUG_ATOMIC("Invalid source coordinate.\n");
+		return -EINVAL;
+	}
+
+	if ((src_x % info->hsub) || (src_w % info->hsub) ||
+	    (src_y % info->vsub) || (src_h % info->vsub)) {
+		DRM_DEBUG_ATOMIC("Wrong subsampling dimension x:%d, y:%d, w:%d, h:%d for format: %x.\n",
+				 src_x, src_y, src_w, src_h, info->format);
+		return -EINVAL;
+	}
+
+	if ((src_x % block_w) || (src_w % block_w) ||
+	    (src_y % block_h) || (src_h % block_h)) {
+		DRM_DEBUG_ATOMIC("x:%d, y:%d, w:%d, h:%d should be multiple of block_w/h for format: %x.\n",
+				 src_x, src_y, src_w, src_h, info->format);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+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 offset, plane_x, plane_y, block_w, block_sz;
+
+	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) {
+		block_w = drm_format_info_block_width(fb->format, plane);
+		block_sz = fb->format->char_per_block[plane];
+		plane_x = x / (plane ? fb->format->hsub : 1);
+		plane_y = y / (plane ? fb->format->vsub : 1);
+
+		offset += (plane_x / block_w) * block_sz
+			+ plane_y * fb->pitches[plane];
+	}
+
+	return obj->paddr + offset;
+}
+
+/* if the fb can be supported by a specific layer */
+bool komeda_fb_is_layer_supported(struct komeda_fb *kfb, u32 layer_type,
+				  u32 rot)
+{
+	struct drm_framebuffer *fb = &kfb->base;
+	struct komeda_dev *mdev = fb->dev->dev_private;
+	u32 fourcc = fb->format->format;
+	u64 modifier = fb->modifier;
+	bool supported;
+
+	supported = komeda_format_mod_supported(&mdev->fmt_tbl, layer_type,
+						fourcc, modifier, rot);
+	if (!supported)
+		DRM_DEBUG_ATOMIC("Layer TYPE: %d doesn't support fb FMT: %s.\n",
+			layer_type, komeda_get_format_name(fourcc, modifier));
+
+	return supported;
+}