| Message ID | 20210115200141.1397785-3-paul.kocialkowski@bootlin.com |
|---|---|
| State | New |
| Headers | show |
| Series | Allwinner MIPI CSI-2 support for A31/V3s/A83T | expand |
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@bootlin.com> > Acked-by: Helen Koike <helen.koike@collabora.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? 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 > * >
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@bootlin.com> > > Acked-by: Helen Koike <helen.koike@collabora.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
Hi everyone, On Fri 15 Jan 21, 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. I think it was Laurent who brought up on IRC that using a submode is probably not a correct way to distinguish between Rx and Tx modes. Thinking about it again, it feels like selecting the direction at run-time would only be relevant if there's D-PHY hardware than can do both Tx and Rx *and* that can be muxed to either a MIPI DSI and a CSI-2 controller at run-time. For the Allwinner case, the D-PHY is the same hardware for both but there will be one instance attached to each controller, not a single shared instance. It feels rather unlikely that a device with both MIPI DSI and CSI-2 would only have one PHY for the two as this wouldn't allow concurrent use of the two controllers. Even in a case where there'd be n controllers and m < n bi-directional PHYs, it feels safe to assume that a static attribution would be sufficient. As a result it feels more relevant to have this distinction in device-tree rather than via the PHY API. What do you think? Any suggestion on how this should be represented in device-tree? Cheers, Paul > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com> > Acked-by: Helen Koike <helen.koike@collabora.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); > 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 > * > -- > 2.30.0 > -- Paul Kocialkowski, Bootlin Embedded Linux and kernel engineering https://bootlin.com
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); 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 *