diff options
Diffstat (limited to 'drivers/gpu/drm/bridge/samsung-dsim.c')
| -rw-r--r-- | drivers/gpu/drm/bridge/samsung-dsim.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index 95fedc68b0ae..e7e53a9e42af 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -574,8 +574,8 @@ static unsigned long samsung_dsim_pll_find_pms(struct samsung_dsim *dsi, u16 _m, best_m; u8 _s, best_s; - p_min = DIV_ROUND_UP(fin, (12 * MHZ)); - p_max = fin / (6 * MHZ); + p_min = DIV_ROUND_UP(fin, (driver_data->pll_fin_max * MHZ)); + p_max = fin / (driver_data->pll_fin_min * MHZ); for (_p = p_min; _p <= p_max; ++_p) { for (_s = 0; _s <= 5; ++_s) { @@ -1606,6 +1606,27 @@ static int samsung_dsim_atomic_check(struct drm_bridge *bridge, adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC); } + /* + * When using video sync pulses, the HFP, HBP, and HSA are divided between + * the available lanes if there is more than one lane. For certain + * timings and lane configurations, the HFP may not be evenly divisible. + * If the HFP is rounded down, it ends up being too small which can cause + * some monitors to not sync properly. In these instances, adjust htotal + * and hsync to round the HFP up, and recalculate the htotal. Through trial + * and error, it appears that the HBP and HSA do not appearto need the same + * correction that HFP does. + */ + if (dsi->lanes > 1) { + int hfp = adjusted_mode->hsync_start - adjusted_mode->hdisplay; + int remainder = hfp % dsi->lanes; + + if (remainder) { + adjusted_mode->hsync_start += remainder; + adjusted_mode->hsync_end += remainder; + adjusted_mode->htotal += remainder; + } + } + return 0; } |