linux-kernel - Re: [PATCH v5 02/16] phy: Distinguish between Rx and Tx for MIPI D-PHY with submodes

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Message-ID: <YK43hBmFkyCChvKw@aptenodytes>
Date:   Wed, 26 May 2021 13:56:52 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-sunxi@...glegroups.com, Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonathan Corbet <corbet@....net>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Helen Koike <helen.koike@...labora.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kevin.lhopital@...mail.com,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Subject: Re: [PATCH v5 02/16] phy: Distinguish between Rx and Tx for MIPI
 D-PHY with submodes

Hi,

On Wed 26 May 21, 13:50, Hans Verkuil wrote:
> On 15/01/2021 21:01, Paul Kocialkowski wrote:
> > As some D-PHY controllers support both Rx and Tx mode, we need a way for
> > users to explicitly request one or the other. For instance, Rx mode can
> > be used along with MIPI CSI-2 while Tx mode can be used with MIPI DSI.
> > 
> > Introduce new MIPI D-PHY PHY submodes to use with PHY_MODE_MIPI_DPHY.
> > The default (zero value) is kept to Tx so only the rkisp1 driver, which
> > uses D-PHY in Rx mode, needs to be adapted.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > Acked-by: Helen Koike <helen.koike@...labora.com>
> > ---
> >  drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c |  3 ++-
> >  include/linux/phy/phy-mipi-dphy.h                   | 13 +++++++++++++
> >  2 files changed, 15 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> > index 2e5b57e3aedc..cab261644102 100644
> > --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> > +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c
> > @@ -948,7 +948,8 @@ static int rkisp1_mipi_csi2_start(struct rkisp1_isp *isp,
> >  
> >  	phy_mipi_dphy_get_default_config(pixel_clock, isp->sink_fmt->bus_width,
> >  					 sensor->lanes, cfg);
> > -	phy_set_mode(sensor->dphy, PHY_MODE_MIPI_DPHY);
> > +	phy_set_mode_ext(cdev->dphy, PHY_MODE_MIPI_DPHY,
> > +			 PHY_MIPI_DPHY_SUBMODE_RX);
> 
> drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c: In function ‘rkisp1_mipi_csi2_start’:
> drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c:951:19: error: ‘cdev’ undeclared (first use in this function)
>   951 |  phy_set_mode_ext(cdev->dphy, PHY_MODE_MIPI_DPHY,
>       |                   ^~~~
> 
> Huh?

Oh wow that's quite shameful. Apologies here.

Note that I'll rebase/respin this series. I also remember that it wasn't very
consensual (on IRC) to use a submode to indicate rx vs tx mode and that
specifying that in the deivce-tree would be a better fit.

Cheers,

Paul

> Regards,
> 
> 	Hans
> 
> >  	phy_configure(sensor->dphy, &opts);
> >  	phy_power_on(sensor->dphy);
> >  
> > diff --git a/include/linux/phy/phy-mipi-dphy.h b/include/linux/phy/phy-mipi-dphy.h
> > index a877ffee845d..0f57ef46a8b5 100644
> > --- a/include/linux/phy/phy-mipi-dphy.h
> > +++ b/include/linux/phy/phy-mipi-dphy.h
> > @@ -6,6 +6,19 @@
> >  #ifndef __PHY_MIPI_DPHY_H_
> >  #define __PHY_MIPI_DPHY_H_
> >  
> > +/**
> > + * enum phy_mipi_dphy_submode - MIPI D-PHY sub-mode
> > + *
> > + * A MIPI D-PHY can be used to transmit or receive data.
> > + * Since some controllers can support both, the direction to enable is specified
> > + * with the PHY sub-mode. Transmit is assumed by default with phy_set_mode.
> > + */
> > +
> > +enum phy_mipi_dphy_submode {
> > +	PHY_MIPI_DPHY_SUBMODE_TX = 0,
> > +	PHY_MIPI_DPHY_SUBMODE_RX,
> > +};
> > +
> >  /**
> >   * struct phy_configure_opts_mipi_dphy - MIPI D-PHY configuration set
> >   *
> > 
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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