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https://github.com/AsahiLinux/u-boot
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video: simplefb
Not really qcom specific, but for now qcom/lk is the one firmware that is (afaiu) setting up the appropriate dt node for pre-configured display. Uses the generic simple-framebuffer DT bindings so this should be useful on other platforms. Signed-off-by: Rob Clark <robdclark@gmail.com>
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parent
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commit
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3 changed files with 84 additions and 1 deletions
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@ -624,4 +624,14 @@ config VIDEO_DW_HDMI
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rather requires a SoC-specific glue driver to call it), it
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can not be enabled from the configuration menu.
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config VIDEO_SIMPLE
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bool "Simple display driver for preconfigured display"
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help
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Enables a simple generic display driver which utilizes the
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simple-framebuffer devicetree bindings.
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This driver assumes that the display hardware has been initialized
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before u-boot starts, and u-boot will simply render to the pre-
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allocated frame buffer surface.
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endmenu
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@ -52,7 +52,7 @@ obj-$(CONFIG_FORMIKE) += formike.o
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obj-$(CONFIG_LG4573) += lg4573.o
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obj-$(CONFIG_AM335X_LCD) += am335x-fb.o
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obj-$(CONFIG_VIDEO_DW_HDMI) += dw_hdmi.o
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obj-$(CONFIG_VIDEO_SIMPLE) += simplefb.o
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obj-${CONFIG_VIDEO_TEGRA124} += tegra124/
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obj-${CONFIG_EXYNOS_FB} += exynos/
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obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/
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73
drivers/video/simplefb.c
Normal file
73
drivers/video/simplefb.c
Normal file
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@ -0,0 +1,73 @@
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/*
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* (C) Copyright 2017 Rob Clark
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <fdt_support.h>
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#include <video.h>
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static int simple_video_probe(struct udevice *dev)
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{
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struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
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struct video_priv *uc_priv = dev_get_uclass_priv(dev);
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const void *blob = gd->fdt_blob;
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const int node = dev_of_offset(dev);
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const char *format;
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fdt_addr_t base;
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fdt_size_t size;
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base = fdtdec_get_addr_size_auto_parent(blob, dev_of_offset(dev->parent),
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node, "reg", 0, &size, false);
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if (base == FDT_ADDR_T_NONE) {
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debug("%s: Failed to decode memory region\n", __func__);
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return -EINVAL;
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}
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debug("%s: base=%llx, size=%llu\n", __func__, base, size);
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/*
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* TODO is there some way to reserve the framebuffer
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* region so it isn't clobbered?
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*/
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plat->base = base;
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plat->size = size;
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video_set_flush_dcache(dev, true);
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debug("%s: Query resolution...\n", __func__);
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uc_priv->xsize = fdtdec_get_uint(blob, node, "width", 0);
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uc_priv->ysize = fdtdec_get_uint(blob, node, "height", 0);
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uc_priv->rot = 0;
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format = fdt_getprop(blob, node, "format", NULL);
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debug("%s: %dx%d@%s\n", __func__, uc_priv->xsize, uc_priv->ysize, format);
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if (strcmp(format, "r5g6b5") == 0) {
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uc_priv->bpix = VIDEO_BPP16;
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} else if (strcmp(format, "a8b8g8r8") == 0) {
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uc_priv->bpix = VIDEO_BPP32;
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} else {
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printf("%s: invalid format: %s\n", __func__, format);
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return -EINVAL;
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}
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return 0;
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}
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static const struct udevice_id simple_video_ids[] = {
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{ .compatible = "simple-framebuffer" },
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{ }
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};
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U_BOOT_DRIVER(simple_video) = {
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.name = "simple_video",
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.id = UCLASS_VIDEO,
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.of_match = simple_video_ids,
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.probe = simple_video_probe,
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.flags = DM_FLAG_PRE_RELOC,
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};
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