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display: Implement mode selection

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-03-27 17:23:22 +09:00
parent 550e39913f
commit 1d19e74ca8
1 changed files with 48 additions and 4 deletions
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52
src/display.c
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@ -24,12 +24,21 @@ dcp_dev_t *dcp;
dcp_iboot_if_t *iboot;
u64 fb_dva;
static void display_choose_timing_mode(dcp_timing_mode_t *modes, int cnt, dcp_timing_mode_t *best)
#define abs(x) ((x) >= 0 ? (x) : -(x))
static void display_choose_timing_mode(dcp_timing_mode_t *modes, int cnt, dcp_timing_mode_t *best,
dcp_timing_mode_t *want)
{
*best = modes[0];
for (int i = 1; i < cnt; i++) {
COMPARE(modes[i].valid, best->valid);
if (want && want->valid) {
COMPARE(modes[i].width == want->width && modes[i].height == want->height,
best->width == want->width && best->height == want->height);
COMPARE(-abs((long)modes[i].fps - (long)want->fps),
-abs((long)best->fps - (long)want->fps));
}
COMPARE(modes[i].width <= 1920, best->width <= 1920);
COMPARE(modes[i].height <= 1200, best->height <= 1200);
COMPARE(modes[i].fps <= 60 << 16, best->fps <= 60 << 16);
@ -39,7 +48,7 @@ static void display_choose_timing_mode(dcp_timing_mode_t *modes, int cnt, dcp_ti
}
printf("display: timing mode: valid=%d %dx%d %d.%02d Hz\n", best->valid, best->width,
best->height, best->fps >> 16, (best->fps & 0xffff) * 99 / 0xffff);
best->height, best->fps >> 16, ((best->fps & 0xffff) * 100 + 0x7fff) >> 16);
}
static void display_choose_color_mode(dcp_color_mode_t *modes, int cnt, dcp_color_mode_t *best)
@ -88,9 +97,44 @@ static int display_start_dcp(void)
return 0;
}
int display_parse_mode(const char *config, dcp_timing_mode_t *mode)
{
memset(mode, 0, sizeof(*mode));
if (!config || !strcmp(config, "auto"))
return 0;
const char *s_w = config;
const char *s_h = strchr(config, 'x');
const char *s_fps = strchr(config, '@');
if (s_w && s_h) {
mode->width = atol(s_w);
mode->height = atol(s_h + 1);
mode->valid = mode->width && mode->height;
}
if (s_fps) {
mode->fps = atol(s_fps + 1) << 16;
const char *s_fps_frac = strchr(s_fps + 1, '.');
if (s_fps_frac) {
// Assumes two decimals...
mode->fps += (atol(s_fps_frac + 1) << 16) / 100;
}
}
printf("display: want mode: valid=%d %dx%d %d.%02d Hz\n", mode->valid, mode->width,
mode->height, mode->fps >> 16, ((mode->fps & 0xffff) * 100 + 0x7fff) >> 16);
return mode->valid;
}
int display_configure(const char *config)
{
UNUSED(config);
dcp_timing_mode_t want;
display_parse_mode(config, &want);
int ret = display_start_dcp();
if (ret < 0)
@ -136,7 +180,7 @@ int display_configure(const char *config)
return -1;
}
assert(ret == timing_cnt);
display_choose_timing_mode(tmodes, timing_cnt, &tbest);
display_choose_timing_mode(tmodes, timing_cnt, &tbest, &want);
dcp_color_mode_t *cmodes, cbest;
if ((ret = dcp_ib_get_color_modes(iboot, &cmodes)) < 0) {