From: Andrzej Hajda <a.hajda@samsung.com>
To: Andrey Smirnov <andrew.smirnov@gmail.com>,
dri-devel@lists.freedesktop.org
Cc: 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: Re: [PATCH v4 10/15] drm/bridge: tc358767: Add support for address-only I2C transfers
Date: Fri, 7 Jun 2019 08:13:24 +0200 [thread overview]
Message-ID: <471cea60-0eb6-920d-bf2f-c34bc3a0b272@samsung.com> (raw)
In-Reply-To: <20190607044550.13361-11-andrew.smirnov@gmail.com>
On 07.06.2019 06:45, Andrey Smirnov wrote:
> Transfer size of zero means a request to do an address-only
> transfer. Since the HW support this, we probably shouldn't be just
> ignoring such requests. While at it allow DP_AUX_I2C_MOT flag to pass
> through, since it is supported by the HW as well.
>
> Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
--
Regards
Andrzej
> 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 | 30 +++++++++++++++++++++++-------
> 1 file changed, 23 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
> index 7d0fbb12195b..4bb9b15e1324 100644
> --- a/drivers/gpu/drm/bridge/tc358767.c
> +++ b/drivers/gpu/drm/bridge/tc358767.c
> @@ -145,6 +145,8 @@
>
> /* AUX channel */
> #define DP0_AUXCFG0 0x0660
> +#define DP0_AUXCFG0_BSIZE GENMASK(11, 8)
> +#define DP0_AUXCFG0_ADDR_ONLY BIT(4)
> #define DP0_AUXCFG1 0x0664
> #define AUX_RX_FILTER_EN BIT(16)
>
> @@ -327,6 +329,18 @@ static int tc_aux_read_data(struct tc_data *tc, void *data, size_t size)
> return size;
> }
>
> +static u32 tc_auxcfg0(struct drm_dp_aux_msg *msg, size_t size)
> +{
> + u32 auxcfg0 = msg->request;
> +
> + if (size)
> + auxcfg0 |= FIELD_PREP(DP0_AUXCFG0_BSIZE, size - 1);
> + else
> + auxcfg0 |= DP0_AUXCFG0_ADDR_ONLY;
> +
> + return auxcfg0;
> +}
> +
> static ssize_t tc_aux_transfer(struct drm_dp_aux *aux,
> struct drm_dp_aux_msg *msg)
> {
> @@ -336,9 +350,6 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux,
> u32 auxstatus;
> int ret;
>
> - if (size == 0)
> - return 0;
> -
> ret = tc_aux_wait_busy(tc, 100);
> if (ret)
> return ret;
> @@ -362,8 +373,7 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux,
> if (ret)
> return ret;
> /* Start transfer */
> - ret = regmap_write(tc->regmap, DP0_AUXCFG0,
> - ((size - 1) << 8) | request);
> + ret = regmap_write(tc->regmap, DP0_AUXCFG0, tc_auxcfg0(msg, size));
> if (ret)
> return ret;
>
> @@ -377,8 +387,14 @@ static ssize_t tc_aux_transfer(struct drm_dp_aux *aux,
>
> if (auxstatus & AUX_TIMEOUT)
> return -ETIMEDOUT;
> -
> - size = FIELD_GET(AUX_BYTES, auxstatus);
> + /*
> + * For some reason address-only DP_AUX_I2C_WRITE (MOT), still
> + * reports 1 byte transferred in its status. To deal we that
> + * we ignore aux_bytes field if we know that this was an
> + * address-only transfer
> + */
> + if (size)
> + size = FIELD_GET(AUX_BYTES, auxstatus);
> msg->reply = FIELD_GET(AUX_STATUS, auxstatus);
>
> switch (request) {
next prev parent reply other threads:[~2019-06-07 6:13 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 ` [PATCH v4 08/15] drm/bridge: tc358767: Increase AUX transfer length limit Andrey Smirnov
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=471cea60-0eb6-920d-bf2f-c34bc3a0b272@samsung.com \
--to=a.hajda@samsung.com \
--cc=Laurent.pinchart@ideasonboard.com \
--cc=andrew.smirnov@gmail.com \
--cc=andrey.gusakov@cogentembedded.com \
--cc=cory.tusar@zii.aero \
--cc=cphealy@gmail.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=l.stach@pengutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=p.zabel@pengutronix.de \
--cc=tomi.valkeinen@ti.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).