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163 lines
5.2 KiB
Diff
163 lines
5.2 KiB
Diff
From a9a47ea599c12d29526138cd6e48f6c9eac19358 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Wed, 27 Feb 2019 17:30:33 +0000
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Subject: [PATCH 366/806] video: bcm2708_fb: Try allocating on the ARM and
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passing to VPU
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Currently the VPU allocates the contiguous buffer for the
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framebuffer.
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Try an alternate path first where we use dma_alloc_coherent
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and pass the buffer to the VPU. Should the VPU firmware not
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support that path, then free the buffer and revert to the
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old behaviour of using the VPU allocation.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/video/fbdev/bcm2708_fb.c | 102 ++++++++++++++++++---
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include/soc/bcm2835/raspberrypi-firmware.h | 1 +
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2 files changed, 91 insertions(+), 12 deletions(-)
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--- a/drivers/video/fbdev/bcm2708_fb.c
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+++ b/drivers/video/fbdev/bcm2708_fb.c
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@@ -98,6 +98,11 @@ struct bcm2708_fb {
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struct bcm2708_fb_stats stats;
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unsigned long fb_bus_address;
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struct { u32 base, length; } gpu;
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+
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+ bool disable_arm_alloc;
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+ unsigned int image_size;
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+ dma_addr_t dma_addr;
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+ void *cpuaddr;
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};
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#define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb)
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@@ -283,23 +288,88 @@ static int bcm2708_fb_set_par(struct fb_
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.xoffset = info->var.xoffset,
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.yoffset = info->var.yoffset,
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.tag5 = { RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE, 8, 0 },
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- .base = 0,
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- .screen_size = 0,
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- .tag6 = { RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH, 4, 0 },
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- .pitch = 0,
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+ /* base and screen_size will be initialised later */
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+ .tag6 = { RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH, 4, 0 },
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+ /* pitch will be initialised later */
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};
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- int ret;
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+ int ret, image_size;
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+
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print_debug("%s(%p) %dx%d (%dx%d), %d, %d\n", __func__, info,
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info->var.xres, info->var.yres, info->var.xres_virtual,
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info->var.yres_virtual, (int)info->screen_size,
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info->var.bits_per_pixel);
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- ret = rpi_firmware_property_list(fb->fw, &fbinfo, sizeof(fbinfo));
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+ /* Try allocating our own buffer. We can specify all the parameters */
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+ image_size = ((info->var.xres * info->var.yres) *
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+ info->var.bits_per_pixel) >> 3;
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+
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+ if (!fb->disable_arm_alloc &&
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+ (image_size != fb->image_size || !fb->dma_addr)) {
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+ if (fb->dma_addr) {
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+ dma_free_coherent(info->device, fb->image_size,
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+ fb->cpuaddr, fb->dma_addr);
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+ fb->image_size = 0;
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+ fb->cpuaddr = NULL;
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+ fb->dma_addr = 0;
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+ }
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+
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+ fb->cpuaddr = dma_alloc_coherent(info->device, image_size,
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+ &fb->dma_addr, GFP_KERNEL);
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+
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+ if (!fb->cpuaddr) {
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+ fb->dma_addr = 0;
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+ fb->disable_arm_alloc = true;
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+ } else {
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+ fb->image_size = image_size;
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+ }
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+ }
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+
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+ if (fb->cpuaddr) {
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+ fbinfo.base = fb->dma_addr;
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+ fbinfo.screen_size = image_size;
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+ fbinfo.pitch = (info->var.xres * info->var.bits_per_pixel) >> 3;
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+
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+ ret = rpi_firmware_property_list(fb->fw, &fbinfo,
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+ sizeof(fbinfo));
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+ if (ret || fbinfo.base != fb->dma_addr) {
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+ /* Firmware either failed, or assigned a different base
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+ * address (ie it doesn't support being passed an FB
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+ * allocation).
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+ * Destroy the allocation, and don't try again.
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+ */
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+ dma_free_coherent(info->device, fb->image_size,
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+ fb->cpuaddr, fb->dma_addr);
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+ fb->image_size = 0;
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+ fb->cpuaddr = NULL;
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+ fb->dma_addr = 0;
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+ fb->disable_arm_alloc = true;
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+ }
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+ } else {
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+ /* Our allocation failed - drop into the old scheme of
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+ * allocation by the VPU.
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+ */
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+ ret = -ENOMEM;
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+ }
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+
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if (ret) {
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- dev_err(info->device,
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- "Failed to allocate GPU framebuffer (%d)\n", ret);
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- return ret;
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+ /* Old scheme:
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+ * - FRAMEBUFFER_ALLOCATE passes 0 for base and screen_size.
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+ * - GET_PITCH instead of SET_PITCH.
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+ */
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+ fbinfo.base = 0;
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+ fbinfo.screen_size = 0;
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+ fbinfo.tag6.tag = RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH;
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+ fbinfo.pitch = 0;
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+
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+ ret = rpi_firmware_property_list(fb->fw, &fbinfo,
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+ sizeof(fbinfo));
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+ if (ret) {
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+ dev_err(info->device,
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+ "Failed to allocate GPU framebuffer (%d)\n",
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+ ret);
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+ return ret;
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+ }
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}
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if (info->var.bits_per_pixel <= 8)
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@@ -314,9 +384,17 @@ static int bcm2708_fb_set_par(struct fb_
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fb->fb.fix.smem_start = fbinfo.base;
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fb->fb.fix.smem_len = fbinfo.pitch * fbinfo.yres_virtual;
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fb->fb.screen_size = fbinfo.screen_size;
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- if (fb->fb.screen_base)
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- iounmap(fb->fb.screen_base);
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- fb->fb.screen_base = ioremap_wc(fbinfo.base, fb->fb.screen_size);
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+
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+ if (!fb->dma_addr) {
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+ if (fb->fb.screen_base)
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+ iounmap(fb->fb.screen_base);
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+
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+ fb->fb.screen_base = ioremap_wc(fbinfo.base,
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+ fb->fb.screen_size);
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+ } else {
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+ fb->fb.screen_base = fb->cpuaddr;
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+ }
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+
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if (!fb->fb.screen_base) {
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/* the console may currently be locked */
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console_trylock();
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--- a/include/soc/bcm2835/raspberrypi-firmware.h
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+++ b/include/soc/bcm2835/raspberrypi-firmware.h
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@@ -128,6 +128,7 @@ enum rpi_firmware_property_tag {
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RPI_FIRMWARE_FRAMEBUFFER_SET_DEPTH = 0x00048005,
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RPI_FIRMWARE_FRAMEBUFFER_SET_PIXEL_ORDER = 0x00048006,
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RPI_FIRMWARE_FRAMEBUFFER_SET_ALPHA_MODE = 0x00048007,
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+ RPI_FIRMWARE_FRAMEBUFFER_SET_PITCH = 0x00048008,
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RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET = 0x00048009,
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RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN = 0x0004800a,
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RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE = 0x0004800b,
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