diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0066-Pulled-in-the-multi-frame-buffer-support-from-the-Pi.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.15/950-0066-Pulled-in-the-multi-frame-buffer-support-from-the-Pi.patch | 828 |
1 files changed, 828 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0066-Pulled-in-the-multi-frame-buffer-support-from-the-Pi.patch b/target/linux/bcm27xx/patches-5.15/950-0066-Pulled-in-the-multi-frame-buffer-support-from-the-Pi.patch new file mode 100644 index 0000000000..ccf7bd96f7 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.15/950-0066-Pulled-in-the-multi-frame-buffer-support-from-the-Pi.patch @@ -0,0 +1,828 @@ +From 35cc50251cbf17c5e855879bcf6d71995f0f271a Mon Sep 17 00:00:00 2001 +From: James Hughes <james.hughes@raspberrypi.org> +Date: Thu, 14 Mar 2019 13:27:54 +0000 +Subject: [PATCH] Pulled in the multi frame buffer support from the Pi3 + repo + +--- + drivers/video/fbdev/bcm2708_fb.c | 457 +++++++++++++++------ + include/soc/bcm2835/raspberrypi-firmware.h | 13 + + 2 files changed, 337 insertions(+), 133 deletions(-) + +--- a/drivers/video/fbdev/bcm2708_fb.c ++++ b/drivers/video/fbdev/bcm2708_fb.c +@@ -2,6 +2,7 @@ + * linux/drivers/video/bcm2708_fb.c + * + * Copyright (C) 2010 Broadcom ++ * Copyright (C) 2018 Raspberry Pi (Trading) Ltd + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive +@@ -13,6 +14,7 @@ + * Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com> + * + */ ++ + #include <linux/module.h> + #include <linux/kernel.h> + #include <linux/errno.h> +@@ -33,6 +35,7 @@ + #include <linux/io.h> + #include <linux/dma-mapping.h> + #include <soc/bcm2835/raspberrypi-firmware.h> ++#include <linux/mutex.h> + + //#define BCM2708_FB_DEBUG + #define MODULE_NAME "bcm2708_fb" +@@ -79,64 +82,150 @@ struct bcm2708_fb_stats { + u32 dma_irqs; + }; + ++struct vc4_display_settings_t { ++ u32 display_num; ++ u32 width; ++ u32 height; ++ u32 depth; ++ u32 pitch; ++ u32 virtual_width; ++ u32 virtual_height; ++ u32 virtual_width_offset; ++ u32 virtual_height_offset; ++ unsigned long fb_bus_address; ++}; ++ ++struct bcm2708_fb_dev; ++ + struct bcm2708_fb { + struct fb_info fb; + struct platform_device *dev; +- struct rpi_firmware *fw; + u32 cmap[16]; + u32 gpu_cmap[256]; +- int dma_chan; +- int dma_irq; +- void __iomem *dma_chan_base; +- void *cb_base; /* DMA control blocks */ +- dma_addr_t cb_handle; + struct dentry *debugfs_dir; +- wait_queue_head_t dma_waitq; +- struct bcm2708_fb_stats stats; ++ struct dentry *debugfs_subdir; + unsigned long fb_bus_address; +- bool disable_arm_alloc; ++ struct { u32 base, length; } gpu; ++ struct vc4_display_settings_t display_settings; ++ struct debugfs_regset32 screeninfo_regset; ++ struct bcm2708_fb_dev *fbdev; + unsigned int image_size; + dma_addr_t dma_addr; + void *cpuaddr; + }; + ++#define MAX_FRAMEBUFFERS 3 ++ ++struct bcm2708_fb_dev { ++ int firmware_supports_multifb; ++ /* Protects the DMA system from multiple FB access */ ++ struct mutex dma_mutex; ++ int dma_chan; ++ int dma_irq; ++ void __iomem *dma_chan_base; ++ wait_queue_head_t dma_waitq; ++ bool disable_arm_alloc; ++ struct bcm2708_fb_stats dma_stats; ++ void *cb_base; /* DMA control blocks */ ++ dma_addr_t cb_handle; ++ int instance_count; ++ int num_displays; ++ struct rpi_firmware *fw; ++ struct bcm2708_fb displays[MAX_FRAMEBUFFERS]; ++}; ++ + #define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb) + + static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb) + { +- debugfs_remove_recursive(fb->debugfs_dir); +- fb->debugfs_dir = NULL; ++ debugfs_remove_recursive(fb->debugfs_subdir); ++ fb->debugfs_subdir = NULL; ++ ++ fb->fbdev->instance_count--; ++ ++ if (!fb->fbdev->instance_count) { ++ debugfs_remove_recursive(fb->debugfs_dir); ++ fb->debugfs_dir = NULL; ++ } + } + + static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb) + { ++ char buf[3]; ++ struct bcm2708_fb_dev *fbdev = fb->fbdev; ++ + static struct debugfs_reg32 stats_registers[] = { +- { +- "dma_copies", +- offsetof(struct bcm2708_fb_stats, dma_copies) +- }, +- { +- "dma_irqs", +- offsetof(struct bcm2708_fb_stats, dma_irqs) +- }, ++ {"dma_copies", offsetof(struct bcm2708_fb_stats, dma_copies)}, ++ {"dma_irqs", offsetof(struct bcm2708_fb_stats, dma_irqs)}, + }; + +- fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL); ++ static struct debugfs_reg32 screeninfo[] = { ++ {"width", offsetof(struct fb_var_screeninfo, xres)}, ++ {"height", offsetof(struct fb_var_screeninfo, yres)}, ++ {"bpp", offsetof(struct fb_var_screeninfo, bits_per_pixel)}, ++ {"xres_virtual", offsetof(struct fb_var_screeninfo, xres_virtual)}, ++ {"yres_virtual", offsetof(struct fb_var_screeninfo, yres_virtual)}, ++ {"xoffset", offsetof(struct fb_var_screeninfo, xoffset)}, ++ {"yoffset", offsetof(struct fb_var_screeninfo, yoffset)}, ++ }; ++ ++ fb->debugfs_dir = debugfs_lookup(DRIVER_NAME, NULL); ++ ++ if (!fb->debugfs_dir) ++ fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL); ++ + if (!fb->debugfs_dir) { +- pr_warn("%s: could not create debugfs entry\n", +- __func__); ++ dev_warn(fb->fb.dev, "%s: could not create debugfs folder\n", ++ __func__); + return -EFAULT; + } + +- fb->stats.regset.regs = stats_registers; +- fb->stats.regset.nregs = ARRAY_SIZE(stats_registers); +- fb->stats.regset.base = &fb->stats; ++ snprintf(buf, sizeof(buf), "%u", fb->display_settings.display_num); ++ ++ fb->debugfs_subdir = debugfs_create_dir(buf, fb->debugfs_dir); + + debugfs_create_regset32("stats", 0444, fb->debugfs_dir, + &fb->stats.regset); ++ ++ if (!fb->debugfs_subdir) { ++ dev_warn(fb->fb.dev, "%s: could not create debugfs entry %u\n", ++ __func__, fb->display_settings.display_num); ++ return -EFAULT; ++ } ++ ++ fbdev->dma_stats.regset.regs = stats_registers; ++ fbdev->dma_stats.regset.nregs = ARRAY_SIZE(stats_registers); ++ fbdev->dma_stats.regset.base = &fbdev->dma_stats; ++ ++ debugfs_create_regset32("dma_stats", 0444, fb->debugfs_subdir, ++ &fbdev->dma_stats.regset); ++ ++ fb->screeninfo_regset.regs = screeninfo; ++ fb->screeninfo_regset.nregs = ARRAY_SIZE(screeninfo); ++ fb->screeninfo_regset.base = &fb->fb.var; ++ ++ debugfs_create_regset32("screeninfo", 0444, fb->debugfs_subdir, ++ &fb->screeninfo_regset); ++ ++ fbdev->instance_count++; ++ + return 0; + } + ++static void set_display_num(struct bcm2708_fb *fb) ++{ ++ if (fb && fb->fbdev && fb->fbdev->firmware_supports_multifb) { ++ u32 tmp = fb->display_settings.display_num; ++ ++ if (rpi_firmware_property(fb->fbdev->fw, ++ RPI_FIRMWARE_FRAMEBUFFER_SET_DISPLAY_NUM, ++ &tmp, ++ sizeof(tmp))) ++ dev_warn_once(fb->fb.dev, ++ "Set display number call failed. Old GPU firmware?"); ++ } ++} ++ + static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var) + { + int ret = 0; +@@ -214,11 +303,11 @@ static int bcm2708_fb_check_var(struct f + struct fb_info *info) + { + /* info input, var output */ +- print_debug("%s(%p) %dx%d (%dx%d), %d, %d\n", ++ print_debug("%s(%p) %ux%u (%ux%u), %ul, %u\n", + __func__, info, info->var.xres, info->var.yres, + info->var.xres_virtual, info->var.yres_virtual, +- (int)info->screen_size, info->var.bits_per_pixel); +- print_debug("%s(%p) %dx%d (%dx%d), %d\n", __func__, var, var->xres, ++ info->screen_size, info->var.bits_per_pixel); ++ print_debug("%s(%p) %ux%u (%ux%u), %u\n", __func__, var, var->xres, + var->yres, var->xres_virtual, var->yres_virtual, + var->bits_per_pixel); + +@@ -281,17 +370,24 @@ static int bcm2708_fb_set_par(struct fb_ + }; + int ret, image_size; + +- +- print_debug("%s(%p) %dx%d (%dx%d), %d, %d\n", __func__, info, ++ print_debug("%s(%p) %dx%d (%dx%d), %d, %d (display %d)\n", __func__, ++ info, + info->var.xres, info->var.yres, info->var.xres_virtual, + info->var.yres_virtual, (int)info->screen_size, +- info->var.bits_per_pixel); ++ info->var.bits_per_pixel, value); ++ ++ /* Need to set the display number to act on first ++ * Cannot do it in the tag list because on older firmware the call ++ * will fail and stop the rest of the list being executed. ++ * We can ignore this call failing as the default at other end is 0 ++ */ ++ set_display_num(fb); + + /* Try allocating our own buffer. We can specify all the parameters */ + image_size = ((info->var.xres * info->var.yres) * + info->var.bits_per_pixel) >> 3; + +- if (!fb->disable_arm_alloc && ++ if (!fb->fbdev->disable_arm_alloc && + (image_size != fb->image_size || !fb->dma_addr)) { + if (fb->dma_addr) { + dma_free_coherent(info->device, fb->image_size, +@@ -306,7 +402,7 @@ static int bcm2708_fb_set_par(struct fb_ + + if (!fb->cpuaddr) { + fb->dma_addr = 0; +- fb->disable_arm_alloc = true; ++ fb->fbdev->disable_arm_alloc = true; + } else { + fb->image_size = image_size; + } +@@ -317,7 +413,7 @@ static int bcm2708_fb_set_par(struct fb_ + fbinfo.screen_size = image_size; + fbinfo.pitch = (info->var.xres * info->var.bits_per_pixel) >> 3; + +- ret = rpi_firmware_property_list(fb->fw, &fbinfo, ++ ret = rpi_firmware_property_list(fb->fbdev->fw, &fbinfo, + sizeof(fbinfo)); + if (ret || fbinfo.base != fb->dma_addr) { + /* Firmware either failed, or assigned a different base +@@ -330,7 +426,7 @@ static int bcm2708_fb_set_par(struct fb_ + fb->image_size = 0; + fb->cpuaddr = NULL; + fb->dma_addr = 0; +- fb->disable_arm_alloc = true; ++ fb->fbdev->disable_arm_alloc = true; + } + } else { + /* Our allocation failed - drop into the old scheme of +@@ -349,7 +445,7 @@ static int bcm2708_fb_set_par(struct fb_ + fbinfo.tag6.tag = RPI_FIRMWARE_FRAMEBUFFER_GET_PITCH; + fbinfo.pitch = 0; + +- ret = rpi_firmware_property_list(fb->fw, &fbinfo, ++ ret = rpi_firmware_property_list(fb->fbdev->fw, &fbinfo, + sizeof(fbinfo)); + if (ret) { + dev_err(info->device, +@@ -439,7 +535,10 @@ static int bcm2708_fb_setcolreg(unsigned + packet->length = regno + 1; + memcpy(packet->cmap, fb->gpu_cmap, + sizeof(packet->cmap)); +- ret = rpi_firmware_property(fb->fw, ++ ++ set_display_num(fb); ++ ++ ret = rpi_firmware_property(fb->fbdev->fw, + RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE, + packet, + (2 + packet->length) * sizeof(u32)); +@@ -478,8 +577,11 @@ static int bcm2708_fb_blank(int blank_mo + return -EINVAL; + } + +- ret = rpi_firmware_property(fb->fw, RPI_FIRMWARE_FRAMEBUFFER_BLANK, ++ set_display_num(fb); ++ ++ ret = rpi_firmware_property(fb->fbdev->fw, RPI_FIRMWARE_FRAMEBUFFER_BLANK, + &value, sizeof(value)); ++ + if (ret) + dev_err(info->device, "%s(%d) failed: %d\n", __func__, + blank_mode, ret); +@@ -496,12 +598,14 @@ static int bcm2708_fb_pan_display(struct + info->var.yoffset = var->yoffset; + result = bcm2708_fb_set_par(info); + if (result != 0) +- pr_err("%s(%d,%d) returns=%d\n", __func__, var->xoffset, ++ pr_err("%s(%u,%u) returns=%d\n", __func__, var->xoffset, + var->yoffset, result); + return result; + } + + static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) ++static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, ++ unsigned long arg) + { + struct bcm2708_fb *fb = to_bcm2708(info); + u32 dummy = 0; +@@ -509,7 +613,9 @@ static int bcm2708_ioctl(struct fb_info + + switch (cmd) { + case FBIO_WAITFORVSYNC: +- ret = rpi_firmware_property(fb->fw, ++ set_display_num(fb); ++ ++ ret = rpi_firmware_property(fb->fbdev->fw, + RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC, + &dummy, sizeof(dummy)); + break; +@@ -526,23 +632,22 @@ static int bcm2708_ioctl(struct fb_info + static void bcm2708_fb_fillrect(struct fb_info *info, + const struct fb_fillrect *rect) + { +- /* (is called) print_debug("bcm2708_fb_fillrect\n"); */ + cfb_fillrect(info, rect); + } + + /* A helper function for configuring dma control block */ + static void set_dma_cb(struct bcm2708_dma_cb *cb, +- int burst_size, +- dma_addr_t dst, +- int dst_stride, +- dma_addr_t src, +- int src_stride, +- int w, +- int h) ++ int burst_size, ++ dma_addr_t dst, ++ int dst_stride, ++ dma_addr_t src, ++ int src_stride, ++ int w, ++ int h) + { + cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH | +- BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH | +- BCM2708_DMA_D_INC | BCM2708_DMA_TDMODE; ++ BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH | ++ BCM2708_DMA_D_INC | BCM2708_DMA_TDMODE; + cb->dst = dst; + cb->src = src; + /* +@@ -560,15 +665,19 @@ static void bcm2708_fb_copyarea(struct f + const struct fb_copyarea *region) + { + struct bcm2708_fb *fb = to_bcm2708(info); +- struct bcm2708_dma_cb *cb = fb->cb_base; ++ struct bcm2708_fb_dev *fbdev = fb->fbdev; ++ struct bcm2708_dma_cb *cb = fbdev->cb_base; + int bytes_per_pixel = (info->var.bits_per_pixel + 7) >> 3; + + /* Channel 0 supports larger bursts and is a bit faster */ +- int burst_size = (fb->dma_chan == 0) ? 8 : 2; ++ int burst_size = (fbdev->dma_chan == 0) ? 8 : 2; + int pixels = region->width * region->height; + +- /* Fallback to cfb_copyarea() if we don't like something */ +- if (bytes_per_pixel > 4 || ++ /* If DMA is currently in use (ie being used on another FB), then ++ * rather than wait for it to finish, just use the cfb_copyarea ++ */ ++ if (!mutex_trylock(&fbdev->dma_mutex) || ++ bytes_per_pixel > 4 || + info->var.xres * info->var.yres > 1920 * 1200 || + region->width <= 0 || region->width > info->var.xres || + region->height <= 0 || region->height > info->var.yres || +@@ -595,8 +704,8 @@ static void bcm2708_fb_copyarea(struct f + * 1920x1200 resolution at 32bpp pixel depth. + */ + int y; +- dma_addr_t control_block_pa = fb->cb_handle; +- dma_addr_t scratchbuf = fb->cb_handle + 16 * 1024; ++ dma_addr_t control_block_pa = fbdev->cb_handle; ++ dma_addr_t scratchbuf = fbdev->cb_handle + 16 * 1024; + int scanline_size = bytes_per_pixel * region->width; + int scanlines_per_cb = (64 * 1024 - 16 * 1024) / scanline_size; + +@@ -646,10 +755,10 @@ static void bcm2708_fb_copyarea(struct f + } + set_dma_cb(cb, burst_size, + fb->fb_bus_address + dy * fb->fb.fix.line_length + +- bytes_per_pixel * region->dx, ++ bytes_per_pixel * region->dx, + stride, + fb->fb_bus_address + sy * fb->fb.fix.line_length + +- bytes_per_pixel * region->sx, ++ bytes_per_pixel * region->sx, + stride, + region->width * bytes_per_pixel, + region->height); +@@ -659,32 +768,33 @@ static void bcm2708_fb_copyarea(struct f + cb->next = 0; + + if (pixels < dma_busy_wait_threshold) { +- bcm_dma_start(fb->dma_chan_base, fb->cb_handle); +- bcm_dma_wait_idle(fb->dma_chan_base); ++ bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle); ++ bcm_dma_wait_idle(fbdev->dma_chan_base); + } else { +- void __iomem *dma_chan = fb->dma_chan_base; ++ void __iomem *local_dma_chan = fbdev->dma_chan_base; + + cb->info |= BCM2708_DMA_INT_EN; +- bcm_dma_start(fb->dma_chan_base, fb->cb_handle); +- while (bcm_dma_is_busy(dma_chan)) { +- wait_event_interruptible(fb->dma_waitq, +- !bcm_dma_is_busy(dma_chan)); ++ bcm_dma_start(fbdev->dma_chan_base, fbdev->cb_handle); ++ while (bcm_dma_is_busy(local_dma_chan)) { ++ wait_event_interruptible(fbdev->dma_waitq, ++ !bcm_dma_is_busy(local_dma_chan)); + } +- fb->stats.dma_irqs++; ++ fbdev->dma_stats.dma_irqs++; + } +- fb->stats.dma_copies++; ++ fbdev->dma_stats.dma_copies++; ++ ++ mutex_unlock(&fbdev->dma_mutex); + } + + static void bcm2708_fb_imageblit(struct fb_info *info, + const struct fb_image *image) + { +- /* (is called) print_debug("bcm2708_fb_imageblit\n"); */ + cfb_imageblit(info, image); + } + + static irqreturn_t bcm2708_fb_dma_irq(int irq, void *cxt) + { +- struct bcm2708_fb *fb = cxt; ++ struct bcm2708_fb_dev *fbdev = cxt; + + /* FIXME: should read status register to check if this is + * actually interrupting us or not, in case this interrupt +@@ -694,9 +804,9 @@ static irqreturn_t bcm2708_fb_dma_irq(in + */ + + /* acknowledge the interrupt */ +- writel(BCM2708_DMA_INT, fb->dma_chan_base + BCM2708_DMA_CS); ++ writel(BCM2708_DMA_INT, fbdev->dma_chan_base + BCM2708_DMA_CS); + +- wake_up(&fb->dma_waitq); ++ wake_up(&fbdev->dma_waitq); + return IRQ_HANDLED; + } + +@@ -729,11 +839,23 @@ static int bcm2708_fb_register(struct bc + fb->fb.fix.ywrapstep = 0; + fb->fb.fix.accel = FB_ACCEL_NONE; + +- fb->fb.var.xres = fbwidth; +- fb->fb.var.yres = fbheight; +- fb->fb.var.xres_virtual = fbwidth; +- fb->fb.var.yres_virtual = fbheight; +- fb->fb.var.bits_per_pixel = fbdepth; ++ /* If we have data from the VC4 on FB's, use that, otherwise use the ++ * module parameters ++ */ ++ if (fb->display_settings.width) { ++ fb->fb.var.xres = fb->display_settings.width; ++ fb->fb.var.yres = fb->display_settings.height; ++ fb->fb.var.xres_virtual = fb->fb.var.xres; ++ fb->fb.var.yres_virtual = fb->fb.var.yres; ++ fb->fb.var.bits_per_pixel = fb->display_settings.depth; ++ } else { ++ fb->fb.var.xres = fbwidth; ++ fb->fb.var.yres = fbheight; ++ fb->fb.var.xres_virtual = fbwidth; ++ fb->fb.var.yres_virtual = fbheight; ++ fb->fb.var.bits_per_pixel = fbdepth; ++ } ++ + fb->fb.var.vmode = FB_VMODE_NONINTERLACED; + fb->fb.var.activate = FB_ACTIVATE_NOW; + fb->fb.var.nonstd = 0; +@@ -749,26 +871,23 @@ static int bcm2708_fb_register(struct bc + fb->fb.monspecs.dclkmax = 100000000; + + bcm2708_fb_set_bitfields(&fb->fb.var); +- init_waitqueue_head(&fb->dma_waitq); + + /* + * Allocate colourmap. + */ +- + fb_set_var(&fb->fb, &fb->fb.var); ++ + ret = bcm2708_fb_set_par(&fb->fb); ++ + if (ret) + return ret; + +- print_debug("BCM2708FB: registering framebuffer (%dx%d@%d) (%d)\n", +- fbwidth, fbheight, fbdepth, fbswap); +- + ret = register_framebuffer(&fb->fb); +- print_debug("BCM2708FB: register framebuffer (%d)\n", ret); ++ + if (ret == 0) + goto out; + +- print_debug("BCM2708FB: cannot register framebuffer (%d)\n", ret); ++ dev_warn(fb->fb.dev, "Unable to register framebuffer (%d)\n", ret); + out: + return ret; + } +@@ -777,10 +896,18 @@ static int bcm2708_fb_probe(struct platf + { + struct device_node *fw_np; + struct rpi_firmware *fw; +- struct bcm2708_fb *fb; +- int ret; ++ int ret, i; ++ u32 num_displays; ++ struct bcm2708_fb_dev *fbdev; ++ struct { u32 base, length; } gpu_mem; ++ ++ fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL); ++ ++ if (!fbdev) ++ return -ENOMEM; + + fw_np = of_parse_phandle(dev->dev.of_node, "firmware", 0); ++ + /* Remove comment when booting without Device Tree is no longer supported + * if (!fw_np) { + * dev_err(&dev->dev, "Missing firmware node\n"); +@@ -788,90 +915,154 @@ static int bcm2708_fb_probe(struct platf + * } + */ + fw = rpi_firmware_get(fw_np); ++ fbdev->fw = fw; ++ + if (!fw) + return -EPROBE_DEFER; + +- fb = kzalloc(sizeof(*fb), GFP_KERNEL); +- if (!fb) { +- ret = -ENOMEM; +- goto free_region; ++ ret = rpi_firmware_property(fw, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS, ++ &num_displays, sizeof(u32)); ++ ++ /* If we fail to get the number of displays, or it returns 0, then ++ * assume old firmware that doesn't have the mailbox call, so just ++ * set one display ++ */ ++ if (ret || num_displays == 0) { ++ num_displays = 1; ++ dev_err(&dev->dev, ++ "Unable to determine number of FB's. Assuming 1\n"); ++ ret = 0; ++ } else { ++ fbdev->firmware_supports_multifb = 1; ++ } ++ ++ if (num_displays > MAX_FRAMEBUFFERS) { ++ dev_warn(&dev->dev, ++ "More displays reported from firmware than supported in driver (%u vs %u)", ++ num_displays, MAX_FRAMEBUFFERS); ++ num_displays = MAX_FRAMEBUFFERS; + } + +- fb->fw = fw; +- bcm2708_fb_debugfs_init(fb); ++ dev_info(&dev->dev, "FB found %d display(s)\n", num_displays); ++ ++ /* Set up the DMA information. Note we have just one set of DMA ++ * parameters to work with all the FB's so requires synchronising when ++ * being used ++ */ ++ ++ mutex_init(&fbdev->dma_mutex); + +- fb->cb_base = dma_alloc_wc(&dev->dev, SZ_64K, +- &fb->cb_handle, GFP_KERNEL); +- if (!fb->cb_base) { ++ fbdev->cb_base = dma_alloc_wc(&dev->dev, SZ_64K, ++ &fbdev->cb_handle, ++ GFP_KERNEL); ++ if (!fbdev->cb_base) { + dev_err(&dev->dev, "cannot allocate DMA CBs\n"); + ret = -ENOMEM; + goto free_fb; + } + +- pr_info("BCM2708FB: allocated DMA memory %pad\n", &fb->cb_handle); +- + ret = bcm_dma_chan_alloc(BCM_DMA_FEATURE_BULK, +- &fb->dma_chan_base, &fb->dma_irq); ++ &fbdev->dma_chan_base, ++ &fbdev->dma_irq); + if (ret < 0) { +- dev_err(&dev->dev, "couldn't allocate a DMA channel\n"); ++ dev_err(&dev->dev, "Couldn't allocate a DMA channel\n"); + goto free_cb; + } +- fb->dma_chan = ret; ++ fbdev->dma_chan = ret; + +- ret = request_irq(fb->dma_irq, bcm2708_fb_dma_irq, +- 0, "bcm2708_fb dma", fb); ++ ret = request_irq(fbdev->dma_irq, bcm2708_fb_dma_irq, ++ 0, "bcm2708_fb DMA", fbdev); + if (ret) { +- pr_err("%s: failed to request DMA irq\n", __func__); ++ dev_err(&dev->dev, ++ "Failed to request DMA irq\n"); + goto free_dma_chan; + } + +- pr_info("BCM2708FB: allocated DMA channel %d\n", fb->dma_chan); ++ rpi_firmware_property(fbdev->fw, ++ RPI_FIRMWARE_GET_VC_MEMORY, ++ &gpu_mem, sizeof(gpu_mem)); ++ ++ for (i = 0; i < num_displays; i++) { ++ struct bcm2708_fb *fb = &fbdev->displays[i]; ++ ++ fb->display_settings.display_num = i; ++ fb->dev = dev; ++ fb->fb.device = &dev->dev; ++ fb->fbdev = fbdev; ++ ++ fb->gpu.base = gpu_mem.base; ++ fb->gpu.length = gpu_mem.length; ++ ++ if (fbdev->firmware_supports_multifb) { ++ ret = rpi_firmware_property(fw, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_SETTINGS, ++ &fb->display_settings, ++ GET_DISPLAY_SETTINGS_PAYLOAD_SIZE); ++ } else { ++ memset(&fb->display_settings, 0, ++ sizeof(fb->display_settings)); ++ } + +- fb->dev = dev; +- fb->fb.device = &dev->dev; ++ ret = bcm2708_fb_register(fb); + +- /* failure here isn't fatal, but we'll fail in vc_mem_copy if +- * fb->gpu is not valid +- */ +- rpi_firmware_property(fb->fw, RPI_FIRMWARE_GET_VC_MEMORY, &fb->gpu, +- sizeof(fb->gpu)); ++ if (ret == 0) { ++ bcm2708_fb_debugfs_init(fb); + +- ret = bcm2708_fb_register(fb); +- if (ret == 0) { +- platform_set_drvdata(dev, fb); +- goto out; ++ fbdev->num_displays++; ++ ++ dev_info(&dev->dev, ++ "Registered framebuffer for display %u, size %ux%u\n", ++ fb->display_settings.display_num, ++ fb->fb.var.xres, ++ fb->fb.var.yres); ++ } else { ++ // Use this to flag if this FB entry is in use. ++ fb->fbdev = NULL; ++ } ++ } ++ ++ // Did we actually successfully create any FB's? ++ if (fbdev->num_displays) { ++ init_waitqueue_head(&fbdev->dma_waitq); ++ platform_set_drvdata(dev, fbdev); ++ return ret; + } + + free_dma_chan: +- bcm_dma_chan_free(fb->dma_chan); ++ bcm_dma_chan_free(fbdev->dma_chan); + free_cb: +- dma_free_wc(&dev->dev, SZ_64K, fb->cb_base, fb->cb_handle); ++ dma_free_wc(&dev->dev, SZ_64K, fbdev->cb_base, ++ fbdev->cb_handle); + free_fb: +- kfree(fb); +-free_region: + dev_err(&dev->dev, "probe failed, err %d\n", ret); +-out: ++ + return ret; + } + + static int bcm2708_fb_remove(struct platform_device *dev) + { +- struct bcm2708_fb *fb = platform_get_drvdata(dev); ++ struct bcm2708_fb_dev *fbdev = platform_get_drvdata(dev); ++ int i; + + platform_set_drvdata(dev, NULL); + +- if (fb->fb.screen_base) +- iounmap(fb->fb.screen_base); +- unregister_framebuffer(&fb->fb); +- +- dma_free_wc(&dev->dev, SZ_64K, fb->cb_base, fb->cb_handle); +- bcm_dma_chan_free(fb->dma_chan); +- +- bcm2708_fb_debugfs_deinit(fb); ++ for (i = 0; i < fbdev->num_displays; i++) { ++ if (fbdev->displays[i].fb.screen_base) ++ iounmap(fbdev->displays[i].fb.screen_base); ++ ++ if (fbdev->displays[i].fbdev) { ++ unregister_framebuffer(&fbdev->displays[i].fb); ++ bcm2708_fb_debugfs_deinit(&fbdev->displays[i]); ++ } ++ } + +- free_irq(fb->dma_irq, fb); ++ dma_free_wc(&dev->dev, SZ_64K, fbdev->cb_base, ++ fbdev->cb_handle); ++ bcm_dma_chan_free(fbdev->dma_chan); ++ free_irq(fbdev->dma_irq, fbdev); + +- kfree(fb); ++ mutex_destroy(&fbdev->dma_mutex); + + return 0; + } +@@ -886,10 +1077,10 @@ static struct platform_driver bcm2708_fb + .probe = bcm2708_fb_probe, + .remove = bcm2708_fb_remove, + .driver = { +- .name = DRIVER_NAME, +- .owner = THIS_MODULE, +- .of_match_table = bcm2708_fb_of_match_table, +- }, ++ .name = DRIVER_NAME, ++ .owner = THIS_MODULE, ++ .of_match_table = bcm2708_fb_of_match_table, ++ }, + }; + + static int __init bcm2708_fb_init(void) +--- a/include/soc/bcm2835/raspberrypi-firmware.h ++++ b/include/soc/bcm2835/raspberrypi-firmware.h +@@ -105,9 +105,15 @@ enum rpi_firmware_property_tag { + RPI_FIRMWARE_FRAMEBUFFER_GET_VIRTUAL_OFFSET = 0x00040009, + RPI_FIRMWARE_FRAMEBUFFER_GET_OVERSCAN = 0x0004000a, + RPI_FIRMWARE_FRAMEBUFFER_GET_PALETTE = 0x0004000b, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_LAYER = 0x0004000c, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_TRANSFORM = 0x0004000d, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_VSYNC = 0x0004000e, + RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF = 0x0004000f, + RPI_FIRMWARE_FRAMEBUFFER_GET_GPIOVIRTBUF = 0x00040010, + RPI_FIRMWARE_FRAMEBUFFER_RELEASE = 0x00048001, ++ RPI_FIRMWARE_FRAMEBUFFER_SET_DISPLAY_NUM = 0x00048013, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_NUM_DISPLAYS = 0x00040013, ++ RPI_FIRMWARE_FRAMEBUFFER_GET_DISPLAY_SETTINGS = 0x00040014, + RPI_FIRMWARE_FRAMEBUFFER_TEST_PHYSICAL_WIDTH_HEIGHT = 0x00044003, + RPI_FIRMWARE_FRAMEBUFFER_TEST_VIRTUAL_WIDTH_HEIGHT = 0x00044004, + RPI_FIRMWARE_FRAMEBUFFER_TEST_DEPTH = 0x00044005, +@@ -116,6 +122,8 @@ enum rpi_firmware_property_tag { + RPI_FIRMWARE_FRAMEBUFFER_TEST_VIRTUAL_OFFSET = 0x00044009, + RPI_FIRMWARE_FRAMEBUFFER_TEST_OVERSCAN = 0x0004400a, + RPI_FIRMWARE_FRAMEBUFFER_TEST_PALETTE = 0x0004400b, ++ RPI_FIRMWARE_FRAMEBUFFER_TEST_LAYER = 0x0004400c, ++ RPI_FIRMWARE_FRAMEBUFFER_TEST_TRANSFORM = 0x0004400d, + RPI_FIRMWARE_FRAMEBUFFER_TEST_VSYNC = 0x0004400e, + RPI_FIRMWARE_FRAMEBUFFER_SET_PHYSICAL_WIDTH_HEIGHT = 0x00048003, + RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_WIDTH_HEIGHT = 0x00048004, +@@ -126,9 +134,12 @@ enum rpi_firmware_property_tag { + RPI_FIRMWARE_FRAMEBUFFER_SET_VIRTUAL_OFFSET = 0x00048009, + RPI_FIRMWARE_FRAMEBUFFER_SET_OVERSCAN = 0x0004800a, + RPI_FIRMWARE_FRAMEBUFFER_SET_PALETTE = 0x0004800b, ++ + RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF = 0x0004801f, + RPI_FIRMWARE_FRAMEBUFFER_SET_GPIOVIRTBUF = 0x00048020, + RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC = 0x0004800e, ++ RPI_FIRMWARE_FRAMEBUFFER_SET_LAYER = 0x0004800c, ++ RPI_FIRMWARE_FRAMEBUFFER_SET_TRANSFORM = 0x0004800d, + RPI_FIRMWARE_FRAMEBUFFER_SET_BACKLIGHT = 0x0004800f, + + RPI_FIRMWARE_VCHIQ_INIT = 0x00048010, +@@ -137,6 +148,8 @@ enum rpi_firmware_property_tag { + RPI_FIRMWARE_GET_DMA_CHANNELS = 0x00060001, + }; + ++#define GET_DISPLAY_SETTINGS_PAYLOAD_SIZE 64 ++ + #if IS_ENABLED(CONFIG_RASPBERRYPI_FIRMWARE) + int rpi_firmware_property(struct rpi_firmware *fw, + u32 tag, void *data, size_t len); |