diff options
| author | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2019-01-03 13:59:52 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-20 10:20:49 +0100 |
| commit | 9a5bce69646dd7c2d2c2977d19de3a6c0e45db05 (patch) | |
| tree | e02ed6465361d97a15c59ce5b431694d4bbae08b /drivers | |
| parent | bfac24ce3362511245d1db4ac54f9edd9cfc8419 (diff) | |
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')
| -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 24bb6bfa36f3..792a2548d3bb 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -1112,10 +1112,20 @@ static bool tc_bridge_mode_fixup(struct drm_bridge *bridge, static int 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; } |