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openwrt-mirror/target/linux/bcm27xx/patches-6.1/950-0108-Pulled-in-the-multi-frame-buffer-support-from-the-Pi.patch
Álvaro Fernández Rojas 793f8ab62c bcm27xx: 6.1: add kernel patches 
Add kernel patches for version 6.1.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2023-06-09 19:12:30 +02:00

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From 4bfcd159944e7387f701cceb85b26f6d6d17fbed 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 ++++++++++++++++++++++---------
1 file changed, 324 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)
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