diff options
Diffstat (limited to 'src/lib/edid.c')
| -rw-r--r-- | src/lib/edid.c | 45 |
1 files changed, 21 insertions, 24 deletions
diff --git a/src/lib/edid.c b/src/lib/edid.c index 3aebc65e00..52898fbfa6 100644 --- a/src/lib/edid.c +++ b/src/lib/edid.c @@ -28,6 +28,7 @@ * at present. */ +#include <assert.h> #include <stddef.h> #include <console/console.h> #include <arch/io.h> @@ -478,30 +479,12 @@ detailed_block(struct edid *result_edid, unsigned char *x, int in_extension, out->mode.vso = ((x[10] >> 4) + ((x[11] & 0x0C) << 2)); out->mode.vspw = ((x[10] & 0x0F) + ((x[11] & 0x03) << 4)); out->mode.vborder = x[16]; - /* set up some reasonable defaults for payloads. - * We observe that most modern chipsets we work with - * tend to support rgb888 without regard to the - * panel bits per color or other settings. The rgb888 - * is a convenient layout for software because - * it avoids the messy bit stuffing of rgb565 or rgb444. - * It makes a reasonable trade of memory for speed. - * So, set up the default for - * 32 bits per pixel - * rgb888 (i.e. no alpha, but pixels on 32-bit boundaries) - * The mainboard can modify these if needed, though - * we have yet to see a case where that will happen. - * The existing ARM mainboards don't even call this function - * so this will not affect them. - */ - out->framebuffer_bits_per_pixel = 32; - - out->x_resolution = ALIGN(out->mode.ha * - ((out->framebuffer_bits_per_pixel + 7) / 8), - 64) / (out->framebuffer_bits_per_pixel/8); - out->y_resolution = out->mode.va; - out->bytes_per_line = ALIGN(out->mode.ha * - ((out->framebuffer_bits_per_pixel + 7)/8), - 64); + + /* We assume rgb888 (32 bits per pixel) framebuffers by default. + * Chipsets that want something else will need to override this + * with another call to edid_set_framebuffer_bits_per_pixel(). */ + edid_set_framebuffer_bits_per_pixel(out, 32); + switch ((x[17] & 0x18) >> 3) { case 0x00: extra_info.syncmethod = " analog composite"; @@ -1539,6 +1522,20 @@ int decode_edid(unsigned char *edid, int size, struct edid *out) * SPWG also says something strange about the LSB of detailed descriptor 1: * "LSB is set to "1" if panel is DE-timing only. H/V can be ignored." */ + +/* Set the framebuffer bits-per-pixel, recalculating all dependent values. */ +void edid_set_framebuffer_bits_per_pixel(struct edid *edid, int fb_bpp) +{ + /* Caller should pass a supported value, everything else is BUG(). */ + assert(fb_bpp == 32 || fb_bpp == 24 || fb_bpp == 16); + + edid->framebuffer_bits_per_pixel = fb_bpp; + edid->bytes_per_line = ALIGN_UP(edid->mode.ha * + div_round_up(fb_bpp, 8), 64); + edid->x_resolution = edid->bytes_per_line / (fb_bpp / 8); + edid->y_resolution = edid->mode.va; +} + /* * Take an edid, and create a framebuffer. Set vbe_valid to 1. */ |