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edid: move timing generation into a separate function 

The timing generation is currently performed inside the function that
fills in the DTD. The DisplayID generation needs it as well, so moving
it out to a separate function.

Based-on: <20210303152948.59943-2-akihiko.odaki@gmail.com>
Signed-off-by: Konstantin Nazarov <mail@knazarov.com>
Message-Id: <20210315114639.91953-1-mail@knazarov.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20210427150824.638359-1-kraxel@redhat.com
Message-Id: <20210427150824.638359-7-kraxel@redhat.com>
This commit is contained in:
Konstantin Nazarov 2021-04-27 17:08:22 +02:00 committed by Gerd Hoffmann
parent fce39fa737
commit 850dc61f5f
1 changed files with 44 additions and 24 deletions
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68
hw/display/edid-generate.c
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@ -45,6 +45,35 @@ static const struct edid_mode {
{ .xres = 640, .yres = 480, .byte = 35, .bit = 5 },
};
typedef struct Timings {
uint32_t xfront;
uint32_t xsync;
uint32_t xblank;
uint32_t yfront;
uint32_t ysync;
uint32_t yblank;
uint64_t clock;
} Timings;
static void generate_timings(Timings *timings, uint32_t refresh_rate,
uint32_t xres, uint32_t yres)
{
/* pull some realistic looking timings out of thin air */
timings->xfront = xres * 25 / 100;
timings->xsync = xres * 3 / 100;
timings->xblank = xres * 35 / 100;
timings->yfront = yres * 5 / 1000;
timings->ysync = yres * 5 / 1000;
timings->yblank = yres * 35 / 1000;
timings->clock = ((uint64_t)refresh_rate *
(xres + timings->xblank) *
(yres + timings->yblank)) / 10000000;
}
static void edid_ext_dta(uint8_t *dta)
{
dta[0] = 0x02;
@ -227,38 +256,29 @@ static void edid_desc_timing(uint8_t *desc, uint32_t refresh_rate,
uint32_t xres, uint32_t yres,
uint32_t xmm, uint32_t ymm)
{
/* pull some realistic looking timings out of thin air */
uint32_t xfront = xres * 25 / 100;
uint32_t xsync = xres * 3 / 100;
uint32_t xblank = xres * 35 / 100;
uint32_t yfront = yres * 5 / 1000;
uint32_t ysync = yres * 5 / 1000;
uint32_t yblank = yres * 35 / 1000;
uint64_t clock = (uint64_t)refresh_rate * (xres + xblank) * (yres + yblank);
stl_le_p(desc, clock / 10000000);
Timings timings;
generate_timings(&timings, refresh_rate, xres, yres);
stl_le_p(desc, timings.clock);
desc[2] = xres & 0xff;
desc[3] = xblank & 0xff;
desc[3] = timings.xblank & 0xff;
desc[4] = (((xres & 0xf00) >> 4) |
((xblank & 0xf00) >> 8));
((timings.xblank & 0xf00) >> 8));
desc[5] = yres & 0xff;
desc[6] = yblank & 0xff;
desc[6] = timings.yblank & 0xff;
desc[7] = (((yres & 0xf00) >> 4) |
((yblank & 0xf00) >> 8));
((timings.yblank & 0xf00) >> 8));
desc[8] = xfront & 0xff;
desc[9] = xsync & 0xff;
desc[8] = timings.xfront & 0xff;
desc[9] = timings.xsync & 0xff;
desc[10] = (((yfront & 0x00f) << 4) |
((ysync & 0x00f) << 0));
desc[11] = (((xfront & 0x300) >> 2) |
((xsync & 0x300) >> 4) |
((yfront & 0x030) >> 2) |
((ysync & 0x030) >> 4));
desc[10] = (((timings.yfront & 0x00f) << 4) |
((timings.ysync & 0x00f) << 0));
desc[11] = (((timings.xfront & 0x300) >> 2) |
((timings.xsync & 0x300) >> 4) |
((timings.yfront & 0x030) >> 2) |
((timings.ysync & 0x030) >> 4));
desc[12] = xmm & 0xff;
desc[13] = ymm & 0xff;