It doesn't always work, as there is just a single adjusted mode, so if parts of the display pipeline disagree on the required sync polarity it's possible to end up with a invalid config. However it also isn't necessary for this bridge chip, as the DPI interface has a configurable sync polarity, so we can just set it up to match the mode.

Signed-off-by: Lucas Stach l.stach@pengutronix.de --- drivers/gpu/drm/bridge/tc358767.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 485717c8f0b4..bd2cae711ca0 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -889,6 +889,7 @@ static int tc_set_edp_video_mode(struct tc_data *tc, u32 dp0_syncval; u32 bits_per_pixel = 24; u32 in_bw, out_bw; + u32 dpipxlfmt;

/* * Recommended maximum number of symbols transferred in a transfer unit: @@ -938,10 +939,15 @@ static int tc_set_edp_video_mode(struct tc_data *tc, if (ret) return ret;

- ret = regmap_write(tc->regmap, DPIPXLFMT, - VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW | - DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | - DPI_BPP_RGB888); + dpipxlfmt = DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888; + + if (mode->flags & DRM_MODE_FLAG_NVSYNC) + dpipxlfmt |= VS_POL_ACTIVE_LOW; + + if (mode->flags & DRM_MODE_FLAG_NHSYNC) + dpipxlfmt |= HS_POL_ACTIVE_LOW; + + ret = regmap_write(tc->regmap, DPIPXLFMT, dpipxlfmt); if (ret) return ret;

@@ -1471,18 +1477,6 @@ tc_edp_bridge_atomic_disable(struct drm_bridge *bridge, dev_err(tc->dev, "main link disable error: %d\n", ret); }

-static bool tc_bridge_mode_fixup(struct drm_bridge *bridge, - const struct drm_display_mode *mode, - struct drm_display_mode *adj) -{ - /* Fixup sync polarities, both hsync and vsync are active low */ - adj->flags = mode->flags; - adj->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC); - adj->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC); - - return true; -} - static int tc_common_atomic_check(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state, struct drm_crtc_state *crtc_state, @@ -1758,7 +1752,6 @@ static const struct drm_bridge_funcs tc_edp_bridge_funcs = { .atomic_check = tc_edp_atomic_check, .atomic_enable = tc_edp_bridge_atomic_enable, .atomic_disable = tc_edp_bridge_atomic_disable, - .mode_fixup = tc_bridge_mode_fixup, .detect = tc_bridge_detect, .get_edid = tc_get_edid, .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,