According to the datasheet tc358767 can transfer up to 16 bytes via its AUX channel, so the artificial limit of 8 apperas to be too low. However only up to 15-bytes seem to be actually supported and trying to use 16-byte transfers results in transfers failing sporadically (with bogus status in case of I2C transfers), so limit it to 15.
Signed-off-by: Andrey Smirnov <[email protected]> Cc: Archit Taneja <[email protected]> Cc: Andrzej Hajda <[email protected]> Cc: Laurent Pinchart <[email protected]> Cc: Tomi Valkeinen <[email protected]> Cc: Andrey Gusakov <[email protected]> Cc: Philipp Zabel <[email protected]> Cc: Cory Tusar <[email protected]> Cc: Chris Healy <[email protected]> Cc: Lucas Stach <[email protected]> Cc: [email protected] Cc: [email protected] --- drivers/gpu/drm/bridge/tc358767.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c index 260fbcd0271e..0125e2f7e076 100644 --- a/drivers/gpu/drm/bridge/tc358767.c +++ b/drivers/gpu/drm/bridge/tc358767.c @@ -374,7 +374,7 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { struct tc_data *tc = aux_to_tc(aux); - size_t size = min_t(size_t, 8, msg->size); + size_t size = min_t(size_t, DP_AUX_MAX_PAYLOAD_BYTES - 1, msg->size); u8 request = msg->request & ~DP_AUX_I2C_MOT; int ret; -- 2.21.0
