forked from Minki/linux
imxfb: add 18 bit support
v2: As pointed out by Hans J. Koch we have to claim we can do 24bit to make software like X work. We are lucky on i.MX that 18bit support has the necessary gaps in the fields to do so. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -14,7 +14,6 @@
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* linux-arm-kernel@lists.arm.linux.org.uk
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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@ -159,6 +158,17 @@ struct imxfb_info {
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#define MIN_XRES 64
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#define MIN_YRES 64
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/* Actually this really is 18bit support, the lowest 2 bits of each colour
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* are unused in hardware. We claim to have 24bit support to make software
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* like X work, which does not support 18bit.
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*/
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static struct imxfb_rgb def_rgb_18 = {
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.red = {.offset = 16, .length = 8,},
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.green = {.offset = 8, .length = 8,},
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.blue = {.offset = 0, .length = 8,},
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.transp = {.offset = 0, .length = 0,},
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};
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static struct imxfb_rgb def_rgb_16_tft = {
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.red = {.offset = 11, .length = 5,},
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.green = {.offset = 5, .length = 6,},
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@ -286,6 +296,9 @@ static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
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pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
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switch (var->bits_per_pixel) {
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case 32:
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rgb = &def_rgb_18;
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break;
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case 16:
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default:
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if (readl(fbi->regs + LCDC_PCR) & PCR_TFT)
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@ -327,9 +340,7 @@ static int imxfb_set_par(struct fb_info *info)
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struct imxfb_info *fbi = info->par;
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struct fb_var_screeninfo *var = &info->var;
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pr_debug("set_par\n");
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if (var->bits_per_pixel == 16)
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if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32)
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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else if (!fbi->cmap_static)
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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