On Tue, Sep 29, 2020 at 12:53:44PM -0700, Peter Collingbourne wrote: > Also partially revert the follow-up change "drm: pl111: Absorb the > external register header". > > This reverts the parts of commits > 7e4e589db76a3cf4c1f534eb5a09cc6422766b93 and > 0fb8125635e8eb5483fb095f98dcf0651206a7b8 that touch paths outside > of drivers/gpu/drm/pl111. > > The fbdev driver is used by Android's FVP configuration. Using the > DRM driver together with DRM's fbdev emulation results in a failure > to boot Android. The root cause is that Android's generic fbdev > userspace driver relies on the ability to set the pixel format via > FBIOPUT_VSCREENINFO, which is not supported by fbdev emulation. > > There have been other less critical behavioral differences identified > between the fbdev driver and the DRM driver with fbdev emulation. The > DRM driver exposes different values for the panel's width, height and > refresh rate, and the DRM driver fails a FBIOPUT_VSCREENINFO syscall > with yres_virtual greater than the maximum supported value instead > of letting the syscall succeed and setting yres_virtual based on yres. > > Signed-off-by: Peter Collingbourne <pcc@xxxxxxxxxx> Applied to drm-misc-fixes, should make it into Linus tree this week. -Daniel > --- > View this change in Gerrit: https://linux-review.googlesource.com/q/I2d7e59b0e693d9fec206d40df190c5aa02844b56 > > MAINTAINERS | 5 + > drivers/video/fbdev/Kconfig | 20 + > drivers/video/fbdev/Makefile | 1 + > drivers/video/fbdev/amba-clcd.c | 986 ++++++++++++++++++++++++++++++++ > include/linux/amba/clcd-regs.h | 87 +++ > include/linux/amba/clcd.h | 290 ++++++++++ > 6 files changed, 1389 insertions(+) > create mode 100644 drivers/video/fbdev/amba-clcd.c > create mode 100644 include/linux/amba/clcd-regs.h > create mode 100644 include/linux/amba/clcd.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index 190c7fa2ea01..671c1fa79e64 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1460,6 +1460,11 @@ S: Odd Fixes > F: drivers/amba/ > F: include/linux/amba/bus.h > > +ARM PRIMECELL CLCD PL110 DRIVER > +M: Russell King <linux@xxxxxxxxxxxxxxx> > +S: Odd Fixes > +F: drivers/video/fbdev/amba-clcd.* > + > ARM PRIMECELL KMI PL050 DRIVER > M: Russell King <linux@xxxxxxxxxxxxxxx> > S: Odd Fixes > diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig > index b2c9dd4f0cb5..402e85450bb5 100644 > --- a/drivers/video/fbdev/Kconfig > +++ b/drivers/video/fbdev/Kconfig > @@ -272,6 +272,26 @@ config FB_PM2_FIFO_DISCONNECT > help > Support the Permedia2 FIFO disconnect feature. > > +config FB_ARMCLCD > + tristate "ARM PrimeCell PL110 support" > + depends on ARM || ARM64 || COMPILE_TEST > + depends on FB && ARM_AMBA && HAS_IOMEM > + select FB_CFB_FILLRECT > + select FB_CFB_COPYAREA > + select FB_CFB_IMAGEBLIT > + select FB_MODE_HELPERS if OF > + select VIDEOMODE_HELPERS if OF > + select BACKLIGHT_CLASS_DEVICE if OF > + help > + This framebuffer device driver is for the ARM PrimeCell PL110 > + Colour LCD controller. ARM PrimeCells provide the building > + blocks for System on a Chip devices. > + > + If you want to compile this as a module (=code which can be > + inserted into and removed from the running kernel), say M > + here and read <file:Documentation/kbuild/modules.rst>. The module > + will be called amba-clcd. > + > config FB_ACORN > bool "Acorn VIDC support" > depends on (FB = y) && ARM && ARCH_ACORN > diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile > index cad4fb64442a..a0705b99e643 100644 > --- a/drivers/video/fbdev/Makefile > +++ b/drivers/video/fbdev/Makefile > @@ -75,6 +75,7 @@ obj-$(CONFIG_FB_HIT) += hitfb.o > obj-$(CONFIG_FB_ATMEL) += atmel_lcdfb.o > obj-$(CONFIG_FB_PVR2) += pvr2fb.o > obj-$(CONFIG_FB_VOODOO1) += sstfb.o > +obj-$(CONFIG_FB_ARMCLCD) += amba-clcd.o > obj-$(CONFIG_FB_GOLDFISH) += goldfishfb.o > obj-$(CONFIG_FB_68328) += 68328fb.o > obj-$(CONFIG_FB_GBE) += gbefb.o > diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c > new file mode 100644 > index 000000000000..b7682de412d8 > --- /dev/null > +++ b/drivers/video/fbdev/amba-clcd.c > @@ -0,0 +1,986 @@ > +/* > + * linux/drivers/video/amba-clcd.c > + * > + * Copyright (C) 2001 ARM Limited, by David A Rusling > + * Updated to 2.5, Deep Blue Solutions 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 > + * for more details. > + * > + * ARM PrimeCell PL110 Color LCD Controller > + */ > +#include <linux/amba/bus.h> > +#include <linux/amba/clcd.h> > +#include <linux/backlight.h> > +#include <linux/clk.h> > +#include <linux/delay.h> > +#include <linux/dma-mapping.h> > +#include <linux/fb.h> > +#include <linux/init.h> > +#include <linux/ioport.h> > +#include <linux/list.h> > +#include <linux/mm.h> > +#include <linux/module.h> > +#include <linux/of_address.h> > +#include <linux/of_graph.h> > +#include <linux/slab.h> > +#include <linux/string.h> > +#include <video/display_timing.h> > +#include <video/of_display_timing.h> > +#include <video/videomode.h> > + > +#define to_clcd(info) container_of(info, struct clcd_fb, fb) > + > +/* This is limited to 16 characters when displayed by X startup */ > +static const char *clcd_name = "CLCD FB"; > + > +/* > + * Unfortunately, the enable/disable functions may be called either from > + * process or IRQ context, and we _need_ to delay. This is _not_ good. > + */ > +static inline void clcdfb_sleep(unsigned int ms) > +{ > + if (in_atomic()) { > + mdelay(ms); > + } else { > + msleep(ms); > + } > +} > + > +static inline void clcdfb_set_start(struct clcd_fb *fb) > +{ > + unsigned long ustart = fb->fb.fix.smem_start; > + unsigned long lstart; > + > + ustart += fb->fb.var.yoffset * fb->fb.fix.line_length; > + lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2; > + > + writel(ustart, fb->regs + CLCD_UBAS); > + writel(lstart, fb->regs + CLCD_LBAS); > +} > + > +static void clcdfb_disable(struct clcd_fb *fb) > +{ > + u32 val; > + > + if (fb->board->disable) > + fb->board->disable(fb); > + > + if (fb->panel->backlight) { > + fb->panel->backlight->props.power = FB_BLANK_POWERDOWN; > + backlight_update_status(fb->panel->backlight); > + } > + > + val = readl(fb->regs + fb->off_cntl); > + if (val & CNTL_LCDPWR) { > + val &= ~CNTL_LCDPWR; > + writel(val, fb->regs + fb->off_cntl); > + > + clcdfb_sleep(20); > + } > + if (val & CNTL_LCDEN) { > + val &= ~CNTL_LCDEN; > + writel(val, fb->regs + fb->off_cntl); > + } > + > + /* > + * Disable CLCD clock source. > + */ > + if (fb->clk_enabled) { > + fb->clk_enabled = false; > + clk_disable(fb->clk); > + } > +} > + > +static void clcdfb_enable(struct clcd_fb *fb, u32 cntl) > +{ > + /* > + * Enable the CLCD clock source. > + */ > + if (!fb->clk_enabled) { > + fb->clk_enabled = true; > + clk_enable(fb->clk); > + } > + > + /* > + * Bring up by first enabling.. > + */ > + cntl |= CNTL_LCDEN; > + writel(cntl, fb->regs + fb->off_cntl); > + > + clcdfb_sleep(20); > + > + /* > + * and now apply power. > + */ > + cntl |= CNTL_LCDPWR; > + writel(cntl, fb->regs + fb->off_cntl); > + > + /* > + * Turn on backlight > + */ > + if (fb->panel->backlight) { > + fb->panel->backlight->props.power = FB_BLANK_UNBLANK; > + backlight_update_status(fb->panel->backlight); > + } > + > + /* > + * finally, enable the interface. > + */ > + if (fb->board->enable) > + fb->board->enable(fb); > +} > + > +static int > +clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var) > +{ > + u32 caps; > + int ret = 0; > + > + if (fb->panel->caps && fb->board->caps) > + caps = fb->panel->caps & fb->board->caps; > + else { > + /* Old way of specifying what can be used */ > + caps = fb->panel->cntl & CNTL_BGR ? > + CLCD_CAP_BGR : CLCD_CAP_RGB; > + /* But mask out 444 modes as they weren't supported */ > + caps &= ~CLCD_CAP_444; > + } > + > + /* Only TFT panels can do RGB888/BGR888 */ > + if (!(fb->panel->cntl & CNTL_LCDTFT)) > + caps &= ~CLCD_CAP_888; > + > + memset(&var->transp, 0, sizeof(var->transp)); > + > + var->red.msb_right = 0; > + var->green.msb_right = 0; > + var->blue.msb_right = 0; > + > + switch (var->bits_per_pixel) { > + case 1: > + case 2: > + case 4: > + case 8: > + /* If we can't do 5551, reject */ > + caps &= CLCD_CAP_5551; > + if (!caps) { > + ret = -EINVAL; > + break; > + } > + > + var->red.length = var->bits_per_pixel; > + var->red.offset = 0; > + var->green.length = var->bits_per_pixel; > + var->green.offset = 0; > + var->blue.length = var->bits_per_pixel; > + var->blue.offset = 0; > + break; > + > + case 16: > + /* If we can't do 444, 5551 or 565, reject */ > + if (!(caps & (CLCD_CAP_444 | CLCD_CAP_5551 | CLCD_CAP_565))) { > + ret = -EINVAL; > + break; > + } > + > + /* > + * Green length can be 4, 5 or 6 depending whether > + * we're operating in 444, 5551 or 565 mode. > + */ > + if (var->green.length == 4 && caps & CLCD_CAP_444) > + caps &= CLCD_CAP_444; > + if (var->green.length == 5 && caps & CLCD_CAP_5551) > + caps &= CLCD_CAP_5551; > + else if (var->green.length == 6 && caps & CLCD_CAP_565) > + caps &= CLCD_CAP_565; > + else { > + /* > + * PL110 officially only supports RGB555, > + * but may be wired up to allow RGB565. > + */ > + if (caps & CLCD_CAP_565) { > + var->green.length = 6; > + caps &= CLCD_CAP_565; > + } else if (caps & CLCD_CAP_5551) { > + var->green.length = 5; > + caps &= CLCD_CAP_5551; > + } else { > + var->green.length = 4; > + caps &= CLCD_CAP_444; > + } > + } > + > + if (var->green.length >= 5) { > + var->red.length = 5; > + var->blue.length = 5; > + } else { > + var->red.length = 4; > + var->blue.length = 4; > + } > + break; > + case 32: > + /* If we can't do 888, reject */ > + caps &= CLCD_CAP_888; > + if (!caps) { > + ret = -EINVAL; > + break; > + } > + > + var->red.length = 8; > + var->green.length = 8; > + var->blue.length = 8; > + break; > + default: > + ret = -EINVAL; > + break; > + } > + > + /* > + * >= 16bpp displays have separate colour component bitfields > + * encoded in the pixel data. Calculate their position from > + * the bitfield length defined above. > + */ > + if (ret == 0 && var->bits_per_pixel >= 16) { > + bool bgr, rgb; > + > + bgr = caps & CLCD_CAP_BGR && var->blue.offset == 0; > + rgb = caps & CLCD_CAP_RGB && var->red.offset == 0; > + > + if (!bgr && !rgb) > + /* > + * The requested format was not possible, try just > + * our capabilities. One of BGR or RGB must be > + * supported. > + */ > + bgr = caps & CLCD_CAP_BGR; > + > + if (bgr) { > + var->blue.offset = 0; > + var->green.offset = var->blue.offset + var->blue.length; > + var->red.offset = var->green.offset + var->green.length; > + } else { > + var->red.offset = 0; > + var->green.offset = var->red.offset + var->red.length; > + var->blue.offset = var->green.offset + var->green.length; > + } > + } > + > + return ret; > +} > + > +static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) > +{ > + struct clcd_fb *fb = to_clcd(info); > + int ret = -EINVAL; > + > + if (fb->board->check) > + ret = fb->board->check(fb, var); > + > + if (ret == 0 && > + var->xres_virtual * var->bits_per_pixel / 8 * > + var->yres_virtual > fb->fb.fix.smem_len) > + ret = -EINVAL; > + > + if (ret == 0) > + ret = clcdfb_set_bitfields(fb, var); > + > + return ret; > +} > + > +static int clcdfb_set_par(struct fb_info *info) > +{ > + struct clcd_fb *fb = to_clcd(info); > + struct clcd_regs regs; > + > + fb->fb.fix.line_length = fb->fb.var.xres_virtual * > + fb->fb.var.bits_per_pixel / 8; > + > + if (fb->fb.var.bits_per_pixel <= 8) > + fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR; > + else > + fb->fb.fix.visual = FB_VISUAL_TRUECOLOR; > + > + fb->board->decode(fb, ®s); > + > + clcdfb_disable(fb); > + > + writel(regs.tim0, fb->regs + CLCD_TIM0); > + writel(regs.tim1, fb->regs + CLCD_TIM1); > + writel(regs.tim2, fb->regs + CLCD_TIM2); > + writel(regs.tim3, fb->regs + CLCD_TIM3); > + > + clcdfb_set_start(fb); > + > + clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000); > + > + fb->clcd_cntl = regs.cntl; > + > + clcdfb_enable(fb, regs.cntl); > + > +#ifdef DEBUG > + printk(KERN_INFO > + "CLCD: Registers set to\n" > + " %08x %08x %08x %08x\n" > + " %08x %08x %08x %08x\n", > + readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1), > + readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3), > + readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS), > + readl(fb->regs + fb->off_ienb), readl(fb->regs + fb->off_cntl)); > +#endif > + > + return 0; > +} > + > +static inline u32 convert_bitfield(int val, struct fb_bitfield *bf) > +{ > + unsigned int mask = (1 << bf->length) - 1; > + > + return (val >> (16 - bf->length) & mask) << bf->offset; > +} > + > +/* > + * Set a single color register. The values supplied have a 16 bit > + * magnitude. Return != 0 for invalid regno. > + */ > +static int > +clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, > + unsigned int blue, unsigned int transp, struct fb_info *info) > +{ > + struct clcd_fb *fb = to_clcd(info); > + > + if (regno < 16) > + fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) | > + convert_bitfield(blue, &fb->fb.var.blue) | > + convert_bitfield(green, &fb->fb.var.green) | > + convert_bitfield(red, &fb->fb.var.red); > + > + if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) { > + int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3); > + u32 val, mask, newval; > + > + newval = (red >> 11) & 0x001f; > + newval |= (green >> 6) & 0x03e0; > + newval |= (blue >> 1) & 0x7c00; > + > + /* > + * 3.2.11: if we're configured for big endian > + * byte order, the palette entries are swapped. > + */ > + if (fb->clcd_cntl & CNTL_BEBO) > + regno ^= 1; > + > + if (regno & 1) { > + newval <<= 16; > + mask = 0x0000ffff; > + } else { > + mask = 0xffff0000; > + } > + > + val = readl(fb->regs + hw_reg) & mask; > + writel(val | newval, fb->regs + hw_reg); > + } > + > + return regno > 255; > +} > + > +/* > + * Blank the screen if blank_mode != 0, else unblank. If blank == NULL > + * then the caller blanks by setting the CLUT (Color Look Up Table) to all > + * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due > + * to e.g. a video mode which doesn't support it. Implements VESA suspend > + * and powerdown modes on hardware that supports disabling hsync/vsync: > + * blank_mode == 2: suspend vsync > + * blank_mode == 3: suspend hsync > + * blank_mode == 4: powerdown > + */ > +static int clcdfb_blank(int blank_mode, struct fb_info *info) > +{ > + struct clcd_fb *fb = to_clcd(info); > + > + if (blank_mode != 0) { > + clcdfb_disable(fb); > + } else { > + clcdfb_enable(fb, fb->clcd_cntl); > + } > + return 0; > +} > + > +static int clcdfb_mmap(struct fb_info *info, > + struct vm_area_struct *vma) > +{ > + struct clcd_fb *fb = to_clcd(info); > + unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT; > + int ret = -EINVAL; > + > + len = info->fix.smem_len; > + > + if (off <= len && vma->vm_end - vma->vm_start <= len - off && > + fb->board->mmap) > + ret = fb->board->mmap(fb, vma); > + > + return ret; > +} > + > +static const struct fb_ops clcdfb_ops = { > + .owner = THIS_MODULE, > + .fb_check_var = clcdfb_check_var, > + .fb_set_par = clcdfb_set_par, > + .fb_setcolreg = clcdfb_setcolreg, > + .fb_blank = clcdfb_blank, > + .fb_fillrect = cfb_fillrect, > + .fb_copyarea = cfb_copyarea, > + .fb_imageblit = cfb_imageblit, > + .fb_mmap = clcdfb_mmap, > +}; > + > +static int clcdfb_register(struct clcd_fb *fb) > +{ > + int ret; > + > + /* > + * ARM PL111 always has IENB at 0x1c; it's only PL110 > + * which is reversed on some platforms. > + */ > + if (amba_manf(fb->dev) == 0x41 && amba_part(fb->dev) == 0x111) { > + fb->off_ienb = CLCD_PL111_IENB; > + fb->off_cntl = CLCD_PL111_CNTL; > + } else { > + fb->off_ienb = CLCD_PL110_IENB; > + fb->off_cntl = CLCD_PL110_CNTL; > + } > + > + fb->clk = clk_get(&fb->dev->dev, NULL); > + if (IS_ERR(fb->clk)) { > + ret = PTR_ERR(fb->clk); > + goto out; > + } > + > + ret = clk_prepare(fb->clk); > + if (ret) > + goto free_clk; > + > + fb->fb.device = &fb->dev->dev; > + > + fb->fb.fix.mmio_start = fb->dev->res.start; > + fb->fb.fix.mmio_len = resource_size(&fb->dev->res); > + > + fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len); > + if (!fb->regs) { > + printk(KERN_ERR "CLCD: unable to remap registers\n"); > + ret = -ENOMEM; > + goto clk_unprep; > + } > + > + fb->fb.fbops = &clcdfb_ops; > + fb->fb.flags = FBINFO_FLAG_DEFAULT; > + fb->fb.pseudo_palette = fb->cmap; > + > + strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id)); > + fb->fb.fix.type = FB_TYPE_PACKED_PIXELS; > + fb->fb.fix.type_aux = 0; > + fb->fb.fix.xpanstep = 0; > + fb->fb.fix.ypanstep = 0; > + fb->fb.fix.ywrapstep = 0; > + fb->fb.fix.accel = FB_ACCEL_NONE; > + > + fb->fb.var.xres = fb->panel->mode.xres; > + fb->fb.var.yres = fb->panel->mode.yres; > + fb->fb.var.xres_virtual = fb->panel->mode.xres; > + fb->fb.var.yres_virtual = fb->panel->mode.yres; > + fb->fb.var.bits_per_pixel = fb->panel->bpp; > + fb->fb.var.grayscale = fb->panel->grayscale; > + fb->fb.var.pixclock = fb->panel->mode.pixclock; > + fb->fb.var.left_margin = fb->panel->mode.left_margin; > + fb->fb.var.right_margin = fb->panel->mode.right_margin; > + fb->fb.var.upper_margin = fb->panel->mode.upper_margin; > + fb->fb.var.lower_margin = fb->panel->mode.lower_margin; > + fb->fb.var.hsync_len = fb->panel->mode.hsync_len; > + fb->fb.var.vsync_len = fb->panel->mode.vsync_len; > + fb->fb.var.sync = fb->panel->mode.sync; > + fb->fb.var.vmode = fb->panel->mode.vmode; > + fb->fb.var.activate = FB_ACTIVATE_NOW; > + fb->fb.var.nonstd = 0; > + fb->fb.var.height = fb->panel->height; > + fb->fb.var.width = fb->panel->width; > + fb->fb.var.accel_flags = 0; > + > + fb->fb.monspecs.hfmin = 0; > + fb->fb.monspecs.hfmax = 100000; > + fb->fb.monspecs.vfmin = 0; > + fb->fb.monspecs.vfmax = 400; > + fb->fb.monspecs.dclkmin = 1000000; > + fb->fb.monspecs.dclkmax = 100000000; > + > + /* > + * Make sure that the bitfields are set appropriately. > + */ > + clcdfb_set_bitfields(fb, &fb->fb.var); > + > + /* > + * Allocate colourmap. > + */ > + ret = fb_alloc_cmap(&fb->fb.cmap, 256, 0); > + if (ret) > + goto unmap; > + > + /* > + * Ensure interrupts are disabled. > + */ > + writel(0, fb->regs + fb->off_ienb); > + > + fb_set_var(&fb->fb, &fb->fb.var); > + > + dev_info(&fb->dev->dev, "%s hardware, %s display\n", > + fb->board->name, fb->panel->mode.name); > + > + ret = register_framebuffer(&fb->fb); > + if (ret == 0) > + goto out; > + > + printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret); > + > + fb_dealloc_cmap(&fb->fb.cmap); > + unmap: > + iounmap(fb->regs); > + clk_unprep: > + clk_unprepare(fb->clk); > + free_clk: > + clk_put(fb->clk); > + out: > + return ret; > +} > + > +#ifdef CONFIG_OF > +static int clcdfb_of_get_dpi_panel_mode(struct device_node *node, > + struct clcd_panel *clcd_panel) > +{ > + int err; > + struct display_timing timing; > + struct videomode video; > + > + err = of_get_display_timing(node, "panel-timing", &timing); > + if (err) { > + pr_err("%pOF: problems parsing panel-timing (%d)\n", node, err); > + return err; > + } > + > + videomode_from_timing(&timing, &video); > + > + err = fb_videomode_from_videomode(&video, &clcd_panel->mode); > + if (err) > + return err; > + > + /* Set up some inversion flags */ > + if (timing.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) > + clcd_panel->tim2 |= TIM2_IPC; > + else if (!(timing.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)) > + /* > + * To preserve backwards compatibility, the IPC (inverted > + * pixel clock) flag needs to be set on any display that > + * doesn't explicitly specify that the pixel clock is > + * active on the negative or positive edge. > + */ > + clcd_panel->tim2 |= TIM2_IPC; > + > + if (timing.flags & DISPLAY_FLAGS_HSYNC_LOW) > + clcd_panel->tim2 |= TIM2_IHS; > + > + if (timing.flags & DISPLAY_FLAGS_VSYNC_LOW) > + clcd_panel->tim2 |= TIM2_IVS; > + > + if (timing.flags & DISPLAY_FLAGS_DE_LOW) > + clcd_panel->tim2 |= TIM2_IOE; > + > + return 0; > +} > + > +static int clcdfb_snprintf_mode(char *buf, int size, struct fb_videomode *mode) > +{ > + return snprintf(buf, size, "%ux%u@%u", mode->xres, mode->yres, > + mode->refresh); > +} > + > +static int clcdfb_of_get_backlight(struct device *dev, > + struct clcd_panel *clcd_panel) > +{ > + struct backlight_device *backlight; > + > + /* Look up the optional backlight device */ > + backlight = devm_of_find_backlight(dev); > + if (IS_ERR(backlight)) > + return PTR_ERR(backlight); > + > + clcd_panel->backlight = backlight; > + return 0; > +} > + > +static int clcdfb_of_get_mode(struct device *dev, struct device_node *panel, > + struct clcd_panel *clcd_panel) > +{ > + int err; > + struct fb_videomode *mode; > + char *name; > + int len; > + > + /* Only directly connected DPI panels supported for now */ > + if (of_device_is_compatible(panel, "panel-dpi")) > + err = clcdfb_of_get_dpi_panel_mode(panel, clcd_panel); > + else > + err = -ENOENT; > + if (err) > + return err; > + mode = &clcd_panel->mode; > + > + len = clcdfb_snprintf_mode(NULL, 0, mode); > + name = devm_kzalloc(dev, len + 1, GFP_KERNEL); > + if (!name) > + return -ENOMEM; > + > + clcdfb_snprintf_mode(name, len + 1, mode); > + mode->name = name; > + > + return 0; > +} > + > +static int clcdfb_of_init_tft_panel(struct clcd_fb *fb, u32 r0, u32 g0, u32 b0) > +{ > + static struct { > + unsigned int part; > + u32 r0, g0, b0; > + u32 caps; > + } panels[] = { > + { 0x110, 1, 7, 13, CLCD_CAP_5551 }, > + { 0x110, 0, 8, 16, CLCD_CAP_888 }, > + { 0x110, 16, 8, 0, CLCD_CAP_888 }, > + { 0x111, 4, 14, 20, CLCD_CAP_444 }, > + { 0x111, 3, 11, 19, CLCD_CAP_444 | CLCD_CAP_5551 }, > + { 0x111, 3, 10, 19, CLCD_CAP_444 | CLCD_CAP_5551 | > + CLCD_CAP_565 }, > + { 0x111, 0, 8, 16, CLCD_CAP_444 | CLCD_CAP_5551 | > + CLCD_CAP_565 | CLCD_CAP_888 }, > + }; > + int i; > + > + /* Bypass pixel clock divider */ > + fb->panel->tim2 |= TIM2_BCD; > + > + /* TFT display, vert. comp. interrupt at the start of the back porch */ > + fb->panel->cntl |= CNTL_LCDTFT | CNTL_LCDVCOMP(1); > + > + fb->panel->caps = 0; > + > + /* Match the setup with known variants */ > + for (i = 0; i < ARRAY_SIZE(panels) && !fb->panel->caps; i++) { > + if (amba_part(fb->dev) != panels[i].part) > + continue; > + if (g0 != panels[i].g0) > + continue; > + if (r0 == panels[i].r0 && b0 == panels[i].b0) > + fb->panel->caps = panels[i].caps; > + } > + > + /* > + * If we actually physically connected the R lines to B and > + * vice versa > + */ > + if (r0 != 0 && b0 == 0) > + fb->panel->bgr_connection = true; > + > + return fb->panel->caps ? 0 : -EINVAL; > +} > + > +static int clcdfb_of_init_display(struct clcd_fb *fb) > +{ > + struct device_node *endpoint, *panel; > + int err; > + unsigned int bpp; > + u32 max_bandwidth; > + u32 tft_r0b0g0[3]; > + > + fb->panel = devm_kzalloc(&fb->dev->dev, sizeof(*fb->panel), GFP_KERNEL); > + if (!fb->panel) > + return -ENOMEM; > + > + /* > + * Fetch the panel endpoint. > + */ > + endpoint = of_graph_get_next_endpoint(fb->dev->dev.of_node, NULL); > + if (!endpoint) > + return -ENODEV; > + > + panel = of_graph_get_remote_port_parent(endpoint); > + if (!panel) > + return -ENODEV; > + > + err = clcdfb_of_get_backlight(&fb->dev->dev, fb->panel); > + if (err) > + return err; > + > + err = clcdfb_of_get_mode(&fb->dev->dev, panel, fb->panel); > + if (err) > + return err; > + > + err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth", > + &max_bandwidth); > + if (!err) { > + /* > + * max_bandwidth is in bytes per second and pixclock in > + * pico-seconds, so the maximum allowed bits per pixel is > + * 8 * max_bandwidth / (PICOS2KHZ(pixclock) * 1000) > + * Rearrange this calculation to avoid overflow and then ensure > + * result is a valid format. > + */ > + bpp = max_bandwidth / (1000 / 8) > + / PICOS2KHZ(fb->panel->mode.pixclock); > + bpp = rounddown_pow_of_two(bpp); > + if (bpp > 32) > + bpp = 32; > + } else > + bpp = 32; > + fb->panel->bpp = bpp; > + > +#ifdef CONFIG_CPU_BIG_ENDIAN > + fb->panel->cntl |= CNTL_BEBO; > +#endif > + fb->panel->width = -1; > + fb->panel->height = -1; > + > + if (of_property_read_u32_array(endpoint, > + "arm,pl11x,tft-r0g0b0-pads", > + tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0) > + return -ENOENT; > + > + return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0], > + tft_r0b0g0[1], tft_r0b0g0[2]); > +} > + > +static int clcdfb_of_vram_setup(struct clcd_fb *fb) > +{ > + int err; > + struct device_node *memory; > + u64 size; > + > + err = clcdfb_of_init_display(fb); > + if (err) > + return err; > + > + memory = of_parse_phandle(fb->dev->dev.of_node, "memory-region", 0); > + if (!memory) > + return -ENODEV; > + > + fb->fb.screen_base = of_iomap(memory, 0); > + if (!fb->fb.screen_base) > + return -ENOMEM; > + > + fb->fb.fix.smem_start = of_translate_address(memory, > + of_get_address(memory, 0, &size, NULL)); > + fb->fb.fix.smem_len = size; > + > + return 0; > +} > + > +static int clcdfb_of_vram_mmap(struct clcd_fb *fb, struct vm_area_struct *vma) > +{ > + unsigned long off, user_size, kernel_size; > + > + > + off = vma->vm_pgoff << PAGE_SHIFT; > + user_size = vma->vm_end - vma->vm_start; > + kernel_size = fb->fb.fix.smem_len; > + > + if (off >= kernel_size || user_size > (kernel_size - off)) > + return -ENXIO; > + > + return remap_pfn_range(vma, vma->vm_start, > + __phys_to_pfn(fb->fb.fix.smem_start) + vma->vm_pgoff, > + user_size, > + pgprot_writecombine(vma->vm_page_prot)); > +} > + > +static void clcdfb_of_vram_remove(struct clcd_fb *fb) > +{ > + iounmap(fb->fb.screen_base); > +} > + > +static int clcdfb_of_dma_setup(struct clcd_fb *fb) > +{ > + unsigned long framesize; > + dma_addr_t dma; > + int err; > + > + err = clcdfb_of_init_display(fb); > + if (err) > + return err; > + > + framesize = PAGE_ALIGN(fb->panel->mode.xres * fb->panel->mode.yres * > + fb->panel->bpp / 8); > + fb->fb.screen_base = dma_alloc_coherent(&fb->dev->dev, framesize, > + &dma, GFP_KERNEL); > + if (!fb->fb.screen_base) > + return -ENOMEM; > + > + fb->fb.fix.smem_start = dma; > + fb->fb.fix.smem_len = framesize; > + > + return 0; > +} > + > +static int clcdfb_of_dma_mmap(struct clcd_fb *fb, struct vm_area_struct *vma) > +{ > + return dma_mmap_wc(&fb->dev->dev, vma, fb->fb.screen_base, > + fb->fb.fix.smem_start, fb->fb.fix.smem_len); > +} > + > +static void clcdfb_of_dma_remove(struct clcd_fb *fb) > +{ > + dma_free_coherent(&fb->dev->dev, fb->fb.fix.smem_len, > + fb->fb.screen_base, fb->fb.fix.smem_start); > +} > + > +static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev) > +{ > + struct clcd_board *board = devm_kzalloc(&dev->dev, sizeof(*board), > + GFP_KERNEL); > + struct device_node *node = dev->dev.of_node; > + > + if (!board) > + return NULL; > + > + board->name = of_node_full_name(node); > + board->caps = CLCD_CAP_ALL; > + board->check = clcdfb_check; > + board->decode = clcdfb_decode; > + if (of_find_property(node, "memory-region", NULL)) { > + board->setup = clcdfb_of_vram_setup; > + board->mmap = clcdfb_of_vram_mmap; > + board->remove = clcdfb_of_vram_remove; > + } else { > + board->setup = clcdfb_of_dma_setup; > + board->mmap = clcdfb_of_dma_mmap; > + board->remove = clcdfb_of_dma_remove; > + } > + > + return board; > +} > +#else > +static struct clcd_board *clcdfb_of_get_board(struct amba_device *dev) > +{ > + return NULL; > +} > +#endif > + > +static int clcdfb_probe(struct amba_device *dev, const struct amba_id *id) > +{ > + struct clcd_board *board = dev_get_platdata(&dev->dev); > + struct clcd_fb *fb; > + int ret; > + > + if (!board) > + board = clcdfb_of_get_board(dev); > + > + if (!board) > + return -EINVAL; > + > + ret = dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)); > + if (ret) > + goto out; > + > + ret = amba_request_regions(dev, NULL); > + if (ret) { > + printk(KERN_ERR "CLCD: unable to reserve regs region\n"); > + goto out; > + } > + > + fb = kzalloc(sizeof(*fb), GFP_KERNEL); > + if (!fb) { > + ret = -ENOMEM; > + goto free_region; > + } > + > + fb->dev = dev; > + fb->board = board; > + > + dev_info(&fb->dev->dev, "PL%03x designer %02x rev%u at 0x%08llx\n", > + amba_part(dev), amba_manf(dev), amba_rev(dev), > + (unsigned long long)dev->res.start); > + > + ret = fb->board->setup(fb); > + if (ret) > + goto free_fb; > + > + ret = clcdfb_register(fb); > + if (ret == 0) { > + amba_set_drvdata(dev, fb); > + goto out; > + } > + > + fb->board->remove(fb); > + free_fb: > + kfree(fb); > + free_region: > + amba_release_regions(dev); > + out: > + return ret; > +} > + > +static int clcdfb_remove(struct amba_device *dev) > +{ > + struct clcd_fb *fb = amba_get_drvdata(dev); > + > + clcdfb_disable(fb); > + unregister_framebuffer(&fb->fb); > + if (fb->fb.cmap.len) > + fb_dealloc_cmap(&fb->fb.cmap); > + iounmap(fb->regs); > + clk_unprepare(fb->clk); > + clk_put(fb->clk); > + > + fb->board->remove(fb); > + > + kfree(fb); > + > + amba_release_regions(dev); > + > + return 0; > +} > + > +static const struct amba_id clcdfb_id_table[] = { > + { > + .id = 0x00041110, > + .mask = 0x000ffffe, > + }, > + { 0, 0 }, > +}; > + > +MODULE_DEVICE_TABLE(amba, clcdfb_id_table); > + > +static struct amba_driver clcd_driver = { > + .drv = { > + .name = "clcd-pl11x", > + }, > + .probe = clcdfb_probe, > + .remove = clcdfb_remove, > + .id_table = clcdfb_id_table, > +}; > + > +static int __init amba_clcdfb_init(void) > +{ > + if (fb_get_options("ambafb", NULL)) > + return -ENODEV; > + > + return amba_driver_register(&clcd_driver); > +} > + > +module_init(amba_clcdfb_init); > + > +static void __exit amba_clcdfb_exit(void) > +{ > + amba_driver_unregister(&clcd_driver); > +} > + > +module_exit(amba_clcdfb_exit); > + > +MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver"); > +MODULE_LICENSE("GPL"); > diff --git a/include/linux/amba/clcd-regs.h b/include/linux/amba/clcd-regs.h > new file mode 100644 > index 000000000000..421b0fa90d6a > --- /dev/null > +++ b/include/linux/amba/clcd-regs.h > @@ -0,0 +1,87 @@ > +/* > + * David A Rusling > + * > + * Copyright (C) 2001 ARM Limited > + * > + * 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 > + * for more details. > + */ > + > +#ifndef AMBA_CLCD_REGS_H > +#define AMBA_CLCD_REGS_H > + > +/* > + * CLCD Controller Internal Register addresses > + */ > +#define CLCD_TIM0 0x00000000 > +#define CLCD_TIM1 0x00000004 > +#define CLCD_TIM2 0x00000008 > +#define CLCD_TIM3 0x0000000c > +#define CLCD_UBAS 0x00000010 > +#define CLCD_LBAS 0x00000014 > + > +#define CLCD_PL110_IENB 0x00000018 > +#define CLCD_PL110_CNTL 0x0000001c > +#define CLCD_PL110_STAT 0x00000020 > +#define CLCD_PL110_INTR 0x00000024 > +#define CLCD_PL110_UCUR 0x00000028 > +#define CLCD_PL110_LCUR 0x0000002C > + > +#define CLCD_PL111_CNTL 0x00000018 > +#define CLCD_PL111_IENB 0x0000001c > +#define CLCD_PL111_RIS 0x00000020 > +#define CLCD_PL111_MIS 0x00000024 > +#define CLCD_PL111_ICR 0x00000028 > +#define CLCD_PL111_UCUR 0x0000002c > +#define CLCD_PL111_LCUR 0x00000030 > + > +#define CLCD_PALL 0x00000200 > +#define CLCD_PALETTE 0x00000200 > + > +#define TIM2_PCD_LO_MASK GENMASK(4, 0) > +#define TIM2_PCD_LO_BITS 5 > +#define TIM2_CLKSEL (1 << 5) > +#define TIM2_ACB_MASK GENMASK(10, 6) > +#define TIM2_IVS (1 << 11) > +#define TIM2_IHS (1 << 12) > +#define TIM2_IPC (1 << 13) > +#define TIM2_IOE (1 << 14) > +#define TIM2_BCD (1 << 26) > +#define TIM2_PCD_HI_MASK GENMASK(31, 27) > +#define TIM2_PCD_HI_BITS 5 > +#define TIM2_PCD_HI_SHIFT 27 > + > +#define CNTL_LCDEN (1 << 0) > +#define CNTL_LCDBPP1 (0 << 1) > +#define CNTL_LCDBPP2 (1 << 1) > +#define CNTL_LCDBPP4 (2 << 1) > +#define CNTL_LCDBPP8 (3 << 1) > +#define CNTL_LCDBPP16 (4 << 1) > +#define CNTL_LCDBPP16_565 (6 << 1) > +#define CNTL_LCDBPP16_444 (7 << 1) > +#define CNTL_LCDBPP24 (5 << 1) > +#define CNTL_LCDBW (1 << 4) > +#define CNTL_LCDTFT (1 << 5) > +#define CNTL_LCDMONO8 (1 << 6) > +#define CNTL_LCDDUAL (1 << 7) > +#define CNTL_BGR (1 << 8) > +#define CNTL_BEBO (1 << 9) > +#define CNTL_BEPO (1 << 10) > +#define CNTL_LCDPWR (1 << 11) > +#define CNTL_LCDVCOMP(x) ((x) << 12) > +#define CNTL_LDMAFIFOTIME (1 << 15) > +#define CNTL_WATERMARK (1 << 16) > + > +/* ST Microelectronics variant bits */ > +#define CNTL_ST_1XBPP_444 0x0 > +#define CNTL_ST_1XBPP_5551 (1 << 17) > +#define CNTL_ST_1XBPP_565 (1 << 18) > +#define CNTL_ST_CDWID_12 0x0 > +#define CNTL_ST_CDWID_16 (1 << 19) > +#define CNTL_ST_CDWID_18 (1 << 20) > +#define CNTL_ST_CDWID_24 ((1 << 19)|(1 << 20)) > +#define CNTL_ST_CEAEN (1 << 21) > +#define CNTL_ST_LCDBPP24_PACKED (6 << 1) > + > +#endif /* AMBA_CLCD_REGS_H */ > diff --git a/include/linux/amba/clcd.h b/include/linux/amba/clcd.h > new file mode 100644 > index 000000000000..b6e0cbeaf533 > --- /dev/null > +++ b/include/linux/amba/clcd.h > @@ -0,0 +1,290 @@ > +/* > + * linux/include/asm-arm/hardware/amba_clcd.h -- Integrator LCD panel. > + * > + * David A Rusling > + * > + * Copyright (C) 2001 ARM Limited > + * > + * 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 > + * for more details. > + */ > +#include <linux/fb.h> > +#include <linux/amba/clcd-regs.h> > + > +enum { > + /* individual formats */ > + CLCD_CAP_RGB444 = (1 << 0), > + CLCD_CAP_RGB5551 = (1 << 1), > + CLCD_CAP_RGB565 = (1 << 2), > + CLCD_CAP_RGB888 = (1 << 3), > + CLCD_CAP_BGR444 = (1 << 4), > + CLCD_CAP_BGR5551 = (1 << 5), > + CLCD_CAP_BGR565 = (1 << 6), > + CLCD_CAP_BGR888 = (1 << 7), > + > + /* connection layouts */ > + CLCD_CAP_444 = CLCD_CAP_RGB444 | CLCD_CAP_BGR444, > + CLCD_CAP_5551 = CLCD_CAP_RGB5551 | CLCD_CAP_BGR5551, > + CLCD_CAP_565 = CLCD_CAP_RGB565 | CLCD_CAP_BGR565, > + CLCD_CAP_888 = CLCD_CAP_RGB888 | CLCD_CAP_BGR888, > + > + /* red/blue ordering */ > + CLCD_CAP_RGB = CLCD_CAP_RGB444 | CLCD_CAP_RGB5551 | > + CLCD_CAP_RGB565 | CLCD_CAP_RGB888, > + CLCD_CAP_BGR = CLCD_CAP_BGR444 | CLCD_CAP_BGR5551 | > + CLCD_CAP_BGR565 | CLCD_CAP_BGR888, > + > + CLCD_CAP_ALL = CLCD_CAP_BGR | CLCD_CAP_RGB, > +}; > + > +struct backlight_device; > + > +struct clcd_panel { > + struct fb_videomode mode; > + signed short width; /* width in mm */ > + signed short height; /* height in mm */ > + u32 tim2; > + u32 tim3; > + u32 cntl; > + u32 caps; > + unsigned int bpp:8, > + fixedtimings:1, > + grayscale:1; > + unsigned int connector; > + struct backlight_device *backlight; > + /* > + * If the B/R lines are switched between the CLCD > + * and the panel we need to know this and not try to > + * compensate with the BGR bit in the control register. > + */ > + bool bgr_connection; > +}; > + > +struct clcd_regs { > + u32 tim0; > + u32 tim1; > + u32 tim2; > + u32 tim3; > + u32 cntl; > + unsigned long pixclock; > +}; > + > +struct clcd_fb; > + > +/* > + * the board-type specific routines > + */ > +struct clcd_board { > + const char *name; > + > + /* > + * Optional. Hardware capability flags. > + */ > + u32 caps; > + > + /* > + * Optional. Check whether the var structure is acceptable > + * for this display. > + */ > + int (*check)(struct clcd_fb *fb, struct fb_var_screeninfo *var); > + > + /* > + * Compulsory. Decode fb->fb.var into regs->*. In the case of > + * fixed timing, set regs->* to the register values required. > + */ > + void (*decode)(struct clcd_fb *fb, struct clcd_regs *regs); > + > + /* > + * Optional. Disable any extra display hardware. > + */ > + void (*disable)(struct clcd_fb *); > + > + /* > + * Optional. Enable any extra display hardware. > + */ > + void (*enable)(struct clcd_fb *); > + > + /* > + * Setup platform specific parts of CLCD driver > + */ > + int (*setup)(struct clcd_fb *); > + > + /* > + * mmap the framebuffer memory > + */ > + int (*mmap)(struct clcd_fb *, struct vm_area_struct *); > + > + /* > + * Remove platform specific parts of CLCD driver > + */ > + void (*remove)(struct clcd_fb *); > +}; > + > +struct amba_device; > +struct clk; > + > +/* this data structure describes each frame buffer device we find */ > +struct clcd_fb { > + struct fb_info fb; > + struct amba_device *dev; > + struct clk *clk; > + struct clcd_panel *panel; > + struct clcd_board *board; > + void *board_data; > + void __iomem *regs; > + u16 off_ienb; > + u16 off_cntl; > + u32 clcd_cntl; > + u32 cmap[16]; > + bool clk_enabled; > +}; > + > +static inline void clcdfb_decode(struct clcd_fb *fb, struct clcd_regs *regs) > +{ > + struct fb_var_screeninfo *var = &fb->fb.var; > + u32 val, cpl; > + > + /* > + * Program the CLCD controller registers and start the CLCD > + */ > + val = ((var->xres / 16) - 1) << 2; > + val |= (var->hsync_len - 1) << 8; > + val |= (var->right_margin - 1) << 16; > + val |= (var->left_margin - 1) << 24; > + regs->tim0 = val; > + > + val = var->yres; > + if (fb->panel->cntl & CNTL_LCDDUAL) > + val /= 2; > + val -= 1; > + val |= (var->vsync_len - 1) << 10; > + val |= var->lower_margin << 16; > + val |= var->upper_margin << 24; > + regs->tim1 = val; > + > + val = fb->panel->tim2; > + val |= var->sync & FB_SYNC_HOR_HIGH_ACT ? 0 : TIM2_IHS; > + val |= var->sync & FB_SYNC_VERT_HIGH_ACT ? 0 : TIM2_IVS; > + > + cpl = var->xres_virtual; > + if (fb->panel->cntl & CNTL_LCDTFT) /* TFT */ > + /* / 1 */; > + else if (!var->grayscale) /* STN color */ > + cpl = cpl * 8 / 3; > + else if (fb->panel->cntl & CNTL_LCDMONO8) /* STN monochrome, 8bit */ > + cpl /= 8; > + else /* STN monochrome, 4bit */ > + cpl /= 4; > + > + regs->tim2 = val | ((cpl - 1) << 16); > + > + regs->tim3 = fb->panel->tim3; > + > + val = fb->panel->cntl; > + if (var->grayscale) > + val |= CNTL_LCDBW; > + > + if (fb->panel->caps && fb->board->caps && var->bits_per_pixel >= 16) { > + /* > + * if board and panel supply capabilities, we can support > + * changing BGR/RGB depending on supplied parameters. Here > + * we switch to what the framebuffer is providing if need > + * be, so if the framebuffer is BGR but the display connection > + * is RGB (first case) we switch it around. Vice versa mutatis > + * mutandis if the framebuffer is RGB but the display connection > + * is BGR, we flip it around. > + */ > + if (var->red.offset == 0) > + val &= ~CNTL_BGR; > + else > + val |= CNTL_BGR; > + if (fb->panel->bgr_connection) > + val ^= CNTL_BGR; > + } > + > + switch (var->bits_per_pixel) { > + case 1: > + val |= CNTL_LCDBPP1; > + break; > + case 2: > + val |= CNTL_LCDBPP2; > + break; > + case 4: > + val |= CNTL_LCDBPP4; > + break; > + case 8: > + val |= CNTL_LCDBPP8; > + break; > + case 16: > + /* > + * PL110 cannot choose between 5551 and 565 modes in its > + * control register. It is possible to use 565 with > + * custom external wiring. > + */ > + if (amba_part(fb->dev) == 0x110 || > + var->green.length == 5) > + val |= CNTL_LCDBPP16; > + else if (var->green.length == 6) > + val |= CNTL_LCDBPP16_565; > + else > + val |= CNTL_LCDBPP16_444; > + break; > + case 32: > + val |= CNTL_LCDBPP24; > + break; > + } > + > + regs->cntl = val; > + regs->pixclock = var->pixclock; > +} > + > +static inline int clcdfb_check(struct clcd_fb *fb, struct fb_var_screeninfo *var) > +{ > + var->xres_virtual = var->xres = (var->xres + 15) & ~15; > + var->yres_virtual = var->yres = (var->yres + 1) & ~1; > + > +#define CHECK(e,l,h) (var->e < l || var->e > h) > + if (CHECK(right_margin, (5+1), 256) || /* back porch */ > + CHECK(left_margin, (5+1), 256) || /* front porch */ > + CHECK(hsync_len, (5+1), 256) || > + var->xres > 4096 || > + var->lower_margin > 255 || /* back porch */ > + var->upper_margin > 255 || /* front porch */ > + var->vsync_len > 32 || > + var->yres > 1024) > + return -EINVAL; > +#undef CHECK > + > + /* single panel mode: PCD = max(PCD, 1) */ > + /* dual panel mode: PCD = max(PCD, 5) */ > + > + /* > + * You can't change the grayscale setting, and > + * we can only do non-interlaced video. > + */ > + if (var->grayscale != fb->fb.var.grayscale || > + (var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED) > + return -EINVAL; > + > +#define CHECK(e) (var->e != fb->fb.var.e) > + if (fb->panel->fixedtimings && > + (CHECK(xres) || > + CHECK(yres) || > + CHECK(bits_per_pixel) || > + CHECK(pixclock) || > + CHECK(left_margin) || > + CHECK(right_margin) || > + CHECK(upper_margin) || > + CHECK(lower_margin) || > + CHECK(hsync_len) || > + CHECK(vsync_len) || > + CHECK(sync))) > + return -EINVAL; > +#undef CHECK > + > + var->nonstd = 0; > + var->accel_flags = 0; > + > + return 0; > +} > -- > 2.28.0.709.gb0816b6eb0-goog > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
