From: Tomi Valkeinen <tomi.valkeinen@ti.com>
To: Andrey Smirnov <andrew.smirnov@gmail.com>,
<dri-devel@lists.freedesktop.org>
Cc: Archit Taneja <architt@codeaurora.org>,
Andrzej Hajda <a.hajda@samsung.com>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Andrey Gusakov <andrey.gusakov@cogentembedded.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
Chris Healy <cphealy@gmail.com>,
Lucas Stach <l.stach@pengutronix.de>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 08/15] drm/bridge: tc358767: Increase AUX transfer length limit
Date: Fri, 22 Mar 2019 15:14:41 +0200 [thread overview]
Message-ID: <7dbccf61-29fb-a6df-7f54-fd7c29bba57f@ti.com> (raw)
In-Reply-To: <20190322032901.12045-9-andrew.smirnov@gmail.com>
On 22/03/2019 05:28, Andrey Smirnov wrote:
> 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.
16 is the limit from the DP spec. I agree, 8 looks odd.
15 looks odd too, so I think it warrants a comment there in the code.
Does 15 byte transfers ever work? Or mostly works but sometimes fails?
Tomi
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next prev parent reply other threads:[~2019-03-22 13:15 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 3:28 [PATCH v2 00/15] tc358767 driver improvements Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 01/15] drm/bridge: tc358767: Simplify tc_poll_timeout() Andrey Smirnov
2019-03-22 10:12 ` Tomi Valkeinen
2019-03-22 3:28 ` [PATCH v2 02/15] drm/bridge: tc358767: Simplify polling in tc_main_link_setup() Andrey Smirnov
2019-03-22 10:13 ` Tomi Valkeinen
2019-03-22 3:28 ` [PATCH v2 03/15] drm/bridge: tc358767: Simplify polling in tc_link_training() Andrey Smirnov
2019-03-22 10:14 ` Tomi Valkeinen
2019-03-22 3:28 ` [PATCH v2 04/15] drm/bridge: tc358767: Simplify tc_set_video_mode() Andrey Smirnov
2019-03-22 10:19 ` Tomi Valkeinen
2019-03-22 17:24 ` Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 05/15] drm/bridge: tc358767: Drop custom tc_write()/tc_read() accessors Andrey Smirnov
2019-03-22 10:29 ` Tomi Valkeinen
2019-03-22 17:45 ` Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 07/15] drm/bridge: tc358767: Simplify AUX data write Andrey Smirnov
2019-03-22 10:51 ` Tomi Valkeinen
2019-03-22 17:25 ` Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 08/15] drm/bridge: tc358767: Increase AUX transfer length limit Andrey Smirnov
2019-03-22 13:14 ` Tomi Valkeinen [this message]
2019-03-22 19:01 ` Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 09/15] drm/bridge: tc358767: Use reported AUX transfer size Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 10/15] drm/bridge: tc358767: Add support for address-only I2C transfers Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 11/15] drm/bridge: tc358767: Introduce tc_set_syspllparam() Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 12/15] drm/bridge: tc358767: Introduce tc_pllupdate_pllen() Andrey Smirnov
2019-03-22 3:28 ` [PATCH v2 13/15] drm/bridge: tc358767: Simplify tc_aux_wait_busy() Andrey Smirnov
2019-03-22 3:29 ` [PATCH v2 14/15] drm/bridge: tc358767: Drop unnecessary 8 byte buffer Andrey Smirnov
2019-03-22 3:29 ` [PATCH v2 15/15] drm/bridge: tc358767: Replace magic number in tc_main_link_enable() Andrey Smirnov
2019-03-22 8:05 ` [PATCH v2 00/15] tc358767 driver improvements Tomi Valkeinen
2019-03-22 19:25 ` Andrey Smirnov
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