From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>,
Andrzej Hajda <a.hajda@samsung.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Cory Tusar <cory.tusar@zii.aero>, Chris Healy <cphealy@gmail.com>,
Lucas Stach <l.stach@pengutronix.de>,
linux-kernel@vger.kernel.org
Subject: [PATCH v4 08/15] drm/bridge: tc358767: Increase AUX transfer length limit
Date: Thu, 6 Jun 2019 21:45:43 -0700 [thread overview]
Message-ID: <20190607044550.13361-9-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190607044550.13361-1-andrew.smirnov@gmail.com>
According to the datasheet tc358767 can transfer up to 16 bytes via
its AUX channel, so the artificial limit of 8 appears 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 <andrew.smirnov@gmail.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Cory Tusar <cory.tusar@zii.aero>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
---
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 e60692b8cd69..8b53dc8908d3 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -354,7 +354,7 @@ 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
next prev parent reply other threads:[~2019-06-07 4:46 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-07 4:45 [PATCH v4 00/15] tc358767 driver improvements Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 01/15] drm/bridge: tc358767: Simplify tc_poll_timeout() Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 02/15] drm/bridge: tc358767: Simplify polling in tc_main_link_setup() Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 03/15] drm/bridge: tc358767: Simplify polling in tc_link_training() Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 04/15] drm/bridge: tc358767: Simplify tc_set_video_mode() Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 05/15] drm/bridge: tc358767: Drop custom tc_write()/tc_read() accessors Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 06/15] drm/bridge: tc358767: Simplify AUX data read Andrey Smirnov
2019-06-07 4:45 ` [PATCH v4 07/15] drm/bridge: tc358767: Simplify AUX data write Andrey Smirnov
2019-06-07 4:45 ` Andrey Smirnov [this message]
2019-06-07 4:45 ` [PATCH v4 09/15] drm/bridge: tc358767: Use reported AUX transfer size Andrey Smirnov
2019-06-07 6:10 ` Andrzej Hajda
2019-06-07 4:45 ` [PATCH v4 10/15] drm/bridge: tc358767: Add support for address-only I2C transfers Andrey Smirnov
2019-06-07 6:13 ` Andrzej Hajda
2019-06-07 4:45 ` [PATCH v4 11/15] drm/bridge: tc358767: Introduce tc_set_syspllparam() Andrey Smirnov
2019-06-07 6:15 ` Andrzej Hajda
2019-06-07 4:45 ` [PATCH v4 12/15] drm/bridge: tc358767: Introduce tc_pllupdate_pllen() Andrey Smirnov
2019-06-07 6:20 ` Andrzej Hajda
2019-06-07 4:45 ` [PATCH v4 13/15] drm/bridge: tc358767: Simplify tc_aux_wait_busy() Andrey Smirnov
2019-06-07 6:21 ` Andrzej Hajda
2019-06-07 4:45 ` [PATCH v4 14/15] drm/bridge: tc358767: Drop unnecessary 8 byte buffer Andrey Smirnov
2019-06-07 6:41 ` Andrzej Hajda
2019-06-07 4:45 ` [PATCH v4 15/15] drm/bridge: tc358767: Replace magic number in tc_main_link_enable() Andrey Smirnov
2019-06-07 6:42 ` Andrzej Hajda
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