diff options
| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2019-01-03 14:59:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-20 12:25:41 +0300 |
| commit | 0c13400bc7433a728e510e80a02d580668445799 (patch) | |
| tree | c4d15176038b49acf0d593133938154c8b9c57ae /drivers/gpu | |
| parent | ad9675e47b495285e3be62a0d9c87edffd0ae8c3 (diff) | |
| download | linux-0c13400bc7433a728e510e80a02d580668445799.tar.xz | |
drm/bridge: tc358767: reject modes which require too much BW
[ Upstream commit 51b9e62eb6950c762162ab7eb8390990179be067 ]
The current driver accepts any videomode with pclk < 154MHz. This is not
correct, as with 1 lane and/or 1.62Mbps speed not all videomodes can be
supported.
Add code to reject modes that require more bandwidth that is available.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190103115954.12785-6-tomi.valkeinen@ti.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/bridge/tc358767.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index ab299f4debfa..a1f3dd2afbb1 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1114,10 +1114,20 @@ static bool tc_bridge_mode_fixup(struct drm_bridge *bridge, static enum drm_mode_status tc_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { + struct tc_data *tc = connector_to_tc(connector); + u32 req, avail; + u32 bits_per_pixel = 24; + /* DPI interface clock limitation: upto 154 MHz */ if (mode->clock > 154000) return MODE_CLOCK_HIGH; + req = mode->clock * bits_per_pixel / 8; + avail = tc->link.base.num_lanes * tc->link.base.rate; + + if (req > avail) + return MODE_BAD; + return MODE_OK; } |