Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_fb_dma_helper.c b/drivers/gpu/drm/drm_fb_dma_helper.c
new file mode 100644
index 000000000..3b535ad1b
--- /dev/null
+++ b/drivers/gpu/drm/drm_fb_dma_helper.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drm kms/fb dma helper functions
+ *
+ * Copyright (C) 2012 Analog Devices Inc.
+ *   Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Based on udl_fbdev.c
+ *  Copyright (C) 2012 Red Hat
+ */
+
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_fb_dma_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_plane.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+
+/**
+ * DOC: framebuffer dma helper functions
+ *
+ * Provides helper functions for creating a DMA-contiguous framebuffer.
+ *
+ * Depending on the platform, the buffers may be physically non-contiguous and
+ * mapped through an IOMMU or a similar mechanism, or allocated from
+ * physically-contiguous memory (using, for instance, CMA or a pool of memory
+ * reserved at early boot). This is handled behind the scenes by the DMA mapping
+ * API.
+ *
+ * drm_gem_fb_create() is used in the &drm_mode_config_funcs.fb_create
+ * callback function to create a DMA-contiguous framebuffer.
+ */
+
+/**
+ * drm_fb_dma_get_gem_obj() - Get DMA GEM object for framebuffer
+ * @fb: The framebuffer
+ * @plane: Which plane
+ *
+ * Return the DMA GEM object for given framebuffer.
+ *
+ * This function will usually be called from the CRTC callback functions.
+ */
+struct drm_gem_dma_object *drm_fb_dma_get_gem_obj(struct drm_framebuffer *fb,
+						  unsigned int plane)
+{
+	struct drm_gem_object *gem;
+
+	gem = drm_gem_fb_get_obj(fb, plane);
+	if (!gem)
+		return NULL;
+
+	return to_drm_gem_dma_obj(gem);
+}
+EXPORT_SYMBOL_GPL(drm_fb_dma_get_gem_obj);
+
+/**
+ * drm_fb_dma_get_gem_addr() - Get DMA (bus) address for framebuffer, for pixel
+ * formats where values are grouped in blocks this will get you the beginning of
+ * the block
+ * @fb: The framebuffer
+ * @state: Which state of drm plane
+ * @plane: Which plane
+ * Return the DMA GEM address for given framebuffer.
+ *
+ * This function will usually be called from the PLANE callback functions.
+ */
+dma_addr_t drm_fb_dma_get_gem_addr(struct drm_framebuffer *fb,
+				   struct drm_plane_state *state,
+				   unsigned int plane)
+{
+	struct drm_gem_dma_object *obj;
+	dma_addr_t dma_addr;
+	u8 h_div = 1, v_div = 1;
+	u32 block_w = drm_format_info_block_width(fb->format, plane);
+	u32 block_h = drm_format_info_block_height(fb->format, plane);
+	u32 block_size = fb->format->char_per_block[plane];
+	u32 sample_x;
+	u32 sample_y;
+	u32 block_start_y;
+	u32 num_hblocks;
+
+	obj = drm_fb_dma_get_gem_obj(fb, plane);
+	if (!obj)
+		return 0;
+
+	dma_addr = obj->dma_addr + fb->offsets[plane];
+
+	if (plane > 0) {
+		h_div = fb->format->hsub;
+		v_div = fb->format->vsub;
+	}
+
+	sample_x = (state->src_x >> 16) / h_div;
+	sample_y = (state->src_y >> 16) / v_div;
+	block_start_y = (sample_y / block_h) * block_h;
+	num_hblocks = sample_x / block_w;
+
+	dma_addr += fb->pitches[plane] * block_start_y;
+	dma_addr += block_size * num_hblocks;
+
+	return dma_addr;
+}
+EXPORT_SYMBOL_GPL(drm_fb_dma_get_gem_addr);
+
+/**
+ * drm_fb_dma_sync_non_coherent - Sync GEM object to non-coherent backing
+ *	memory
+ * @drm: DRM device
+ * @old_state: Old plane state
+ * @state: New plane state
+ *
+ * This function can be used by drivers that use damage clips and have
+ * DMA GEM objects backed by non-coherent memory. Calling this function
+ * in a plane's .atomic_update ensures that all the data in the backing
+ * memory have been written to RAM.
+ */
+void drm_fb_dma_sync_non_coherent(struct drm_device *drm,
+				  struct drm_plane_state *old_state,
+				  struct drm_plane_state *state)
+{
+	const struct drm_format_info *finfo = state->fb->format;
+	struct drm_atomic_helper_damage_iter iter;
+	const struct drm_gem_dma_object *dma_obj;
+	unsigned int offset, i;
+	struct drm_rect clip;
+	dma_addr_t daddr;
+	size_t nb_bytes;
+
+	for (i = 0; i < finfo->num_planes; i++) {
+		dma_obj = drm_fb_dma_get_gem_obj(state->fb, i);
+		if (!dma_obj->map_noncoherent)
+			continue;
+
+		daddr = drm_fb_dma_get_gem_addr(state->fb, state, i);
+		drm_atomic_helper_damage_iter_init(&iter, old_state, state);
+
+		drm_atomic_for_each_plane_damage(&iter, &clip) {
+			/* Ignore x1/x2 values, invalidate complete lines */
+			offset = clip.y1 * state->fb->pitches[i];
+
+			nb_bytes = (clip.y2 - clip.y1) * state->fb->pitches[i];
+			dma_sync_single_for_device(drm->dev, daddr + offset,
+						   nb_bytes, DMA_TO_DEVICE);
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(drm_fb_dma_sync_non_coherent);