drm/meson: vclk: fix calculation of 59.94 fractional rates

Playing 4K media with 59.94 fractional rate (typically VP9) causes the screen to lose
sync with the following error reported in the system log:

[   89.610280] Fatal Error, invalid HDMI vclk freq 593406

Modetest shows the following:

3840x2160 59.94 3840 4016 4104 4400 2160 2168 2178 2250 593407 flags: xxxx, xxxx,
drm calculated value -------------------------------------^

Change the fractional rate calculation to stop DIV_ROUND_CLOSEST rounding down which
results in vclk freq failing to match correctly.

Fixes: e5fab2ec9ca4 ("drm/meson: vclk: add support for YUV420 setup")
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240109230704.4120561-1-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240109230704.4120561-1-christianshewitt@gmail.com

diff --git a/drivers/gpu/drm/meson/meson_vclk.c b/drivers/gpu/drm/meson/meson_vclk.c
index 2a82119eb58ed847061d27fa3b1c182ba520e0ff..2a942dc6a6dc23561ec26a54139b27acf8009ccb 100644 (file)
--- a/drivers/gpu/drm/meson/meson_vclk.c
+++ b/drivers/gpu/drm/meson/meson_vclk.c
@@ -790,13 +790,13 @@ meson_vclk_vic_supported_freq(struct meson_drm *priv, unsigned int phy_freq,
                                 FREQ_1000_1001(params[i].pixel_freq));
                DRM_DEBUG_DRIVER("i = %d phy_freq = %d alt = %d\n",
                                 i, params[i].phy_freq,
-                                FREQ_1000_1001(params[i].phy_freq/10)*10);
+                                FREQ_1000_1001(params[i].phy_freq/1000)*1000);
                /* Match strict frequency */
                if (phy_freq == params[i].phy_freq &&
                    vclk_freq == params[i].vclk_freq)
                        return MODE_OK;
                /* Match 1000/1001 variant */
-               if (phy_freq == (FREQ_1000_1001(params[i].phy_freq/10)*10) &&
+               if (phy_freq == (FREQ_1000_1001(params[i].phy_freq/1000)*1000) &&
                    vclk_freq == FREQ_1000_1001(params[i].vclk_freq))
                        return MODE_OK;
        }
@@ -1070,7 +1070,7 @@ void meson_vclk_setup(struct meson_drm *priv, unsigned int target,
 
        for (freq = 0 ; params[freq].pixel_freq ; ++freq) {
                if ((phy_freq == params[freq].phy_freq ||
-                    phy_freq == FREQ_1000_1001(params[freq].phy_freq/10)*10) &&
+                    phy_freq == FREQ_1000_1001(params[freq].phy_freq/1000)*1000) &&
                    (vclk_freq == params[freq].vclk_freq ||
                     vclk_freq == FREQ_1000_1001(params[freq].vclk_freq))) {
                        if (vclk_freq != params[freq].vclk_freq)