From 0ca1071f7dbd673de826eb3fb01bfdfd1d423433 Mon Sep 17 00:00:00 2001 From: Michal Januszewski Date: Mon, 13 Apr 2009 14:39:43 -0700 Subject: [PATCH] uvesafb: fix color component length for pseudocolor modes uvesafb incorrectly sets the length of the color fields to 6 bits for PSEUDOCOLOR modes, even though 8 bits are always used per pixel. Fix this by setting the length to 8. The switch of the DAC width from the default 6 bits to 8 bits is retained and tracked internally in the driver, but never exposed to userspace. Signed-off-by: Michal Januszewski Acked-by: Krzysztof Helt Cc: Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/uvesafb.c | 35 ++++++++++------------------------- 1 file changed, 10 insertions(+), 25 deletions(-) diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c index 0b370aebdbfd..421770b5e6ab 100644 --- a/drivers/video/uvesafb.c +++ b/drivers/video/uvesafb.c @@ -55,6 +55,7 @@ static u16 maxvf __devinitdata; /* maximum vertical frequency */ static u16 maxhf __devinitdata; /* maximum horizontal frequency */ static u16 vbemode __devinitdata; /* force use of a specific VBE mode */ static char *mode_option __devinitdata; +static u8 dac_width = 6; static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX]; static DEFINE_MUTEX(uvfb_lock); @@ -303,22 +304,10 @@ static void uvesafb_setup_var(struct fb_var_screeninfo *var, var->blue.offset = 0; var->transp.offset = 0; - /* - * We're assuming that we can switch the DAC to 8 bits. If - * this proves to be incorrect, we'll update the fields - * later in set_par(). - */ - if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC) { - var->red.length = 8; - var->green.length = 8; - var->blue.length = 8; - var->transp.length = 0; - } else { - var->red.length = 6; - var->green.length = 6; - var->blue.length = 6; - var->transp.length = 0; - } + var->red.length = 8; + var->green.length = 8; + var->blue.length = 8; + var->transp.length = 0; } } @@ -1006,7 +995,7 @@ static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green, struct fb_info *info) { struct uvesafb_pal_entry entry; - int shift = 16 - info->var.green.length; + int shift = 16 - dac_width; int err = 0; if (regno >= info->cmap.len) @@ -1055,7 +1044,7 @@ static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green, static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info) { struct uvesafb_pal_entry *entries; - int shift = 16 - info->var.green.length; + int shift = 16 - dac_width; int i, err = 0; if (info->var.bits_per_pixel == 8) { @@ -1317,13 +1306,9 @@ static int uvesafb_set_par(struct fb_info *info) err = uvesafb_exec(task); if (err || (task->t.regs.eax & 0xffff) != 0x004f || ((task->t.regs.ebx & 0xff00) >> 8) != 8) { - /* - * We've failed to set the DAC palette format - - * time to correct var. - */ - info->var.red.length = 6; - info->var.green.length = 6; - info->var.blue.length = 6; + dac_width = 6; + } else { + dac_width = 8; } } -- 2.45.2