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kdrive/fbdev: Respect the user-provided refresh rate

Browse source 
If the refresh rate is in the known mode list, we use that.
If not, we generate a mode using the CVT formula.

If we cannot set the mode we want, we try other modes,
but don't exceed the requested refresh rate.

Signed-off-by: stefan11111 <stefan11111github@gmail.com>
This commit is contained in:
stefan11111 2026-07-05 18:33:55 +03:00 • committed by Enrico Weigelt
commit ce761d7101
1 changed files with 32 additions and 13 deletions
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45
hw/kdrive/fbdev/fbdev.c
View file

@ -168,7 +168,7 @@ fbdevGetRefreshRate(const struct fb_var_screeninfo *var)
* However, if the rate reported by the driver is wrong, the driver probably doesn't care about
* refresh rates.
*/
return 103;
return -1;
#undef PICOS2HZ
}
@ -282,27 +282,32 @@ fbdevScreenInitialize(KdScreenInfo * screen, FbdevScrPriv * scrpriv)
Pixel allbits;
int depth;
int rate;
Bool want_rate = FALSE;
Bool gray;
struct fb_var_screeninfo var;
const KdMonitorTiming *t;
KdMonitorTiming curr_mode = {0};
int k;
#define FB_DEFAULT_RATE 103 /* The highest rate in the modelist from kmode.c */
k = ioctl(priv->fd, FBIOGET_VSCREENINFO, &var);
if (!screen->width || !screen->height) {
if (k >= 0) {
screen->width = var.xres;
screen->height = var.yres;
screen->rate = fbdevGetRefreshRate(&var);
} else {
screen->width = 1024;
screen->height = 768;
screen->rate = 103;
}
}
if (!screen->rate) {
screen->rate = (k >= 0) ? fbdevGetRefreshRate(&var) : 103;
screen->rate = (k >= 0) ? fbdevGetRefreshRate(&var) : FB_DEFAULT_RATE;
if (screen->rate <= 0) {
screen->rate = FB_DEFAULT_RATE;
}
} else {
want_rate = TRUE;
}
if (!screen->fb.depth) {
if (k >= 0)
@ -314,30 +319,44 @@ fbdevScreenInitialize(KdScreenInfo * screen, FbdevScrPriv * scrpriv)
scrpriv->max_width = 0;
scrpriv->max_height = 0;
rate = KdFindRate(screen, fbdevModeSupported);
if (k >= 0) {
KdMonitorTiming curr_mode = {0};
int saved_width = screen->width;
int saved_height = screen->height;
scrpriv->max_width = var.xres;
scrpriv->max_height = var.yres;
/* See if the current size is known */
screen->width = var.xres;
screen->height = var.yres;
rate = KdFindRate(screen, fbdevModeSupported);
screen->width = saved_width;
screen->height = saved_height;
/* Add the current framebuffer mode */
fbdevConvertVarToTiming(&var, &curr_mode);
KdAddMode(&curr_mode);
if (!rate) {
/* Add the desired framebuffer mode */
curr_mode.horizontal = screen->width;
curr_mode.vertical = screen->height;
if (curr_mode.rate > 0) {
KdAddMode(&curr_mode);
} else if (!rate) {
KdAddModeCVT(var.xres, var.yres, screen->rate);
}
}
rate = KdFindRate(screen, fbdevModeSupported);
if (!rate || want_rate || (k < 0) || (screen->width != var.xres) || (screen->height != var.yres)) {
/* Add the desired framebuffer mode */
KdAddModeCVT(screen->width, screen->height, screen->rate);
}
/* Fbdev rate isn't reliable, don't forbid modes based on it */
if (screen->rate < rate) {
if (!want_rate && (screen->rate < rate)) {
screen->rate = rate;
}
t = KdFindMode(screen, fbdevModeSupported);
/**
* XXX The only way we can check what modes are supported is by actually setting them.
*