dri-devel.lists.freedesktop.org archive mirror
 help / color / mirror / Atom feed
From: Loic Poulain <loic.poulain@linaro.org>
To: Frieder Schrempf <frieder.schrempf@kontron.de>
Cc: Marek Vasut <marex@denx.de>,
	ch@denx.de, Douglas Anderson <dianders@chromium.org>,
	dri-devel@lists.freedesktop.org,
	Stephen Boyd <swboyd@chromium.org>,
	Philippe Schenker <philippe.schenker@toradex.com>,
	Jagan Teki <jagan@amarulasolutions.com>,
	Valentin Raevsky <valentin@compulab.co.il>,
	Sam Ravnborg <sam@ravnborg.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Subject: Re: [PATCH V2 2/2] drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver
Date: Wed, 28 Apr 2021 11:26:23 +0200	[thread overview]
Message-ID: <CAMZdPi8kuru4+tQ3Oz-rv+D5F--8LHWa+ppJ_ywH7MWz+auKYA@mail.gmail.com> (raw)
In-Reply-To: <66386909-5b89-78ab-6fcc-5bef95a66035@kontron.de>

On Wed, 28 Apr 2021 at 10:13, Frieder Schrempf
<frieder.schrempf@kontron.de> wrote:
>
> On 28.04.21 09:51, Frieder Schrempf wrote:
> > On 22.04.21 00:31, Marek Vasut wrote:
> >> Add driver for TI SN65DSI83 Single-link DSI to Single-link LVDS bridge
> >> and TI SN65DSI84 Single-link DSI to Dual-link or 2x Single-link LVDS
> >> bridge. TI SN65DSI85 is unsupported due to lack of hardware to test on,
> >> but easy to add.
> >>
> >> The driver operates the chip via I2C bus. Currently the LVDS clock are
> >> always derived from DSI clock lane, which is the usual mode of operation.
> >> Support for clock from external oscillator is not implemented, but it is
> >> easy to add if ever needed. Only RGB888 pixel format is implemented, the
> >> LVDS666 is not supported, but could be added if needed.
> >>
> >> Signed-off-by: Marek Vasut <marex@denx.de>
> >> Cc: Douglas Anderson <dianders@chromium.org>
> >> Cc: Jagan Teki <jagan@amarulasolutions.com>
> >> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >> Cc: Linus Walleij <linus.walleij@linaro.org>
> >> Cc: Philippe Schenker <philippe.schenker@toradex.com>
> >> Cc: Sam Ravnborg <sam@ravnborg.org>
> >> Cc: Stephen Boyd <swboyd@chromium.org>
> >> Cc: Valentin Raevsky <valentin@compulab.co.il>
> >> To: dri-devel@lists.freedesktop.org
> >> Tested-by: Loic Poulain <loic.poulain@linaro.org>
> >> ---
> >> V2: - Use dev_err_probe()
> >>      - Set REG_RC_RESET as volatile
> >>      - Wait for PLL stabilization by polling REG_RC_LVDS_PLL
> >>      - Use ctx->mode = *adj instead of *mode in sn65dsi83_mode_set
> >>      - Add tested DSI84 support in dual-link mode
> >>      - Correctly set VCOM
> >>      - Fill in missing DSI CHB and LVDS CHB bits from DSI84 and DSI85
> >>        datasheets, with that all the reserved bits make far more sense
> >>        as the DSI83 and DSI84 seems to be reduced version of DSI85
> >> ---
> >>   drivers/gpu/drm/bridge/Kconfig        |  10 +
> >>   drivers/gpu/drm/bridge/Makefile       |   1 +
> >>   drivers/gpu/drm/bridge/ti-sn65dsi83.c | 617 ++++++++++++++++++++++++++
> >>   3 files changed, 628 insertions(+)
> >>   create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi83.c
> >>
> > [...]
> >> +static int sn65dsi83_probe(struct i2c_client *client,
> >> +               const struct i2c_device_id *id)
> >> +{
> >> +    struct device *dev = &client->dev;
> >> +    enum sn65dsi83_model model;
> >> +    struct sn65dsi83 *ctx;
> >> +    int ret;
> >> +
> >> +    ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> >> +    if (!ctx)
> >> +        return -ENOMEM;
> >> +
> >> +    ctx->dev = dev;
> >> +
> >> +    if (dev->of_node)
> >> +        model = (enum sn65dsi83_model)of_device_get_match_data(dev);
> >> +    else
> >> +        model = id->driver_data;
> >> +
> >> +    /* Default to dual-link LVDS on all but DSI83. */
> >> +    if (model != MODEL_SN65DSI83)
> >> +        ctx->lvds_dual_link = true;
> >
> > What if I use the DSI84 with a single link LVDS? I can't see any way to
> > configure that right now.

I assume the simplest way would be to use the "ti,sn65dsi83"
compatible string in your dts, since the way you wired it is
'compatible' with sn65dsi83, right?

>
> I just saw the note in the header of the driver that says that single
> link mode is unsupported for the DSI84.
>
> I have hardware with a single link display and if I set
> ctx->lvds_dual_link = false it works just fine.
>
> How is this supposed to be selected? Does it need an extra devicetree
> property? And would you mind adding single-link support in the next
> version or do you prefer adding it in a follow-up patch?

If this has to be supported I think the proper way would be to support
two output ports in the dts (e.g. lvds0_out, lvds1_out), in the same
way as supported by the 'advantech,idk-2121wr' panel.

Regards,
Loic
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2021-04-28  9:17 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-21 22:31 [PATCH V2 1/2] dt-bindings: drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 bindings Marek Vasut
2021-04-21 22:31 ` [PATCH V2 2/2] drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver Marek Vasut
2021-04-23 16:03   ` Loic Poulain
2021-04-28  7:51   ` Frieder Schrempf
2021-04-28  8:13     ` Frieder Schrempf
2021-04-28  9:26       ` Loic Poulain [this message]
2021-04-28  9:24         ` Neil Armstrong
2021-04-28  9:49           ` Jagan Teki
2021-04-28 14:18             ` Marek Vasut
2021-04-28 14:16           ` Marek Vasut
2021-04-29 16:27             ` Frieder Schrempf
2021-04-30  8:34               ` Neil Armstrong
2021-04-21 22:56 ` [PATCH V2 1/2] dt-bindings: drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 bindings Laurent Pinchart
2021-04-22  8:38 ` Neil Armstrong
2021-04-22 16:16   ` Marek Vasut
2021-04-22  8:43 ` Jagan Teki
2021-04-22 16:22   ` Marek Vasut
2021-04-28  7:56 ` Frieder Schrempf
2021-04-28 14:19   ` Marek Vasut
2021-04-27 12:15 [PATCH V2 2/2] drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver Felix Radensky

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=CAMZdPi8kuru4+tQ3Oz-rv+D5F--8LHWa+ppJ_ywH7MWz+auKYA@mail.gmail.com \
    --to=loic.poulain@linaro.org \
    --cc=ch@denx.de \
    --cc=dianders@chromium.org \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=frieder.schrempf@kontron.de \
    --cc=jagan@amarulasolutions.com \
    --cc=laurent.pinchart@ideasonboard.com \
    --cc=marex@denx.de \
    --cc=philippe.schenker@toradex.com \
    --cc=sam@ravnborg.org \
    --cc=swboyd@chromium.org \
    --cc=valentin@compulab.co.il \
    --subject='Re: [PATCH V2 2/2] drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver' \
    /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

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).