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Date: Thu, 2 Mar 2017 13:24:02 +0200
From: Sakari Ailus <sakari.ailus@....fi>
To: Pavel Machek <pavel@....cz>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
mchehab@...nel.org, kernel list <linux-kernel@...r.kernel.org>,
ivo.g.dimitrov.75@...il.com, sre@...nel.org, pali.rohar@...il.com,
linux-media@...r.kernel.org
Subject: Re: [PATCHv2] omap3isp: add support for CSI1 bus
Hi Pavel,
On Thu, Mar 02, 2017 at 11:16:04AM +0100, Pavel Machek wrote:
> Hi!
>
> > > > >> +++ b/drivers/media/platform/omap3isp/ispccp2.c
> > > > >> @@ -160,6 +163,33 @@ static int ccp2_if_enable(struct isp_ccp2_device
> > > > >> *ccp2, u8 enable) return ret;
> > > > >>
> > > > >> }
> > > > >>
> > > > >> + if (isp->revision == ISP_REVISION_2_0) {
> > > > >
> > > > > The isp_csiphy.c code checks phy->isp->phy_type for the same purpose,
> > > > > shouldn't you use that too ?
> > > >
> > > > Do you want me to do phy->isp->phy_type == ISP_PHY_TYPE_3430 check
> > > > here? Can do...
> > >
> > > Yes that's what I meant.
> >
> > Ok, that's something I can do.
> >
> > But code is still somewhat "interesting". Code in omap3isp_csiphy_acquire()
> > assumes csi2, and I don't need most of it.. so I'll just not use it,
> > but it looks strange. I'll post new patch shortly.
>
> Ok, how about this one?
>
> Pavel
>
> omap3isp: add rest of CSI1 support
>
> CSI1 needs one more bit to be set up. Do just that.
>
> It is not as straightforward as I'd like, see the comments in the code
> for explanation.
>
> Signed-off-by: Pavel Machek <pavel@....cz>
>
> index ca09523..b6e055e 100644
> --- a/drivers/media/platform/omap3isp/ispccp2.c
> +++ b/drivers/media/platform/omap3isp/ispccp2.c
> @@ -21,6 +23,7 @@
> #include <linux/mutex.h>
> #include <linux/uaccess.h>
> #include <linux/regulator/consumer.h>
> +#include <linux/regmap.h>
>
> #include "isp.h"
> #include "ispreg.h"
> @@ -160,6 +163,22 @@ static int ccp2_if_enable(struct isp_ccp2_device *ccp2, u8 enable)
> return ret;
> }
>
> + if (isp->phy_type == ISP_PHY_TYPE_3430) {
> + struct media_pad *pad;
> + struct v4l2_subdev *sensor;
> + const struct isp_ccp2_cfg *buscfg;
> +
> + pad = media_entity_remote_pad(&ccp2->pads[CCP2_PAD_SINK]);
> + sensor = media_entity_to_v4l2_subdev(pad->entity);
> + /* Struct isp_bus_cfg has union inside */
> + buscfg = &((struct isp_bus_cfg *)sensor->host_priv)->bus.ccp2;
> +
> + csiphy_routing_cfg_3430(&isp->isp_csiphy2,
> + ISP_INTERFACE_CCP2B_PHY1,
> + enable, !!buscfg->phy_layer,
> + buscfg->strobe_clk_pol);
You should do this through omap3isp_csiphy_acquire(), and not call
csiphy_routing_cfg_3430() directly from here.
> + }
> +
> /* Enable/Disable all the LCx channels */
> for (i = 0; i < CCP2_LCx_CHANS_NUM; i++)
> isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_CCP2, ISPCCP2_LCx_CTRL(i),
> @@ -1137,10 +1159,19 @@ int omap3isp_ccp2_init(struct isp_device *isp)
> if (isp->revision == ISP_REVISION_2_0) {
> ccp2->vdds_csib = devm_regulator_get(isp->dev, "vdds_csib");
> if (IS_ERR(ccp2->vdds_csib)) {
> + if (PTR_ERR(ccp2->vdds_csib) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
This should go to a separate patch.
> dev_dbg(isp->dev,
> "Could not get regulator vdds_csib\n");
> ccp2->vdds_csib = NULL;
> }
> + /*
> + * If we set up ccp2->phy here,
> + * omap3isp_csiphy_acquire() will go ahead and assume
> + * csi2, dereferencing some null pointers.
> + *
> + * ccp2->phy = &isp->isp_csiphy2;
That needs to be fixed separately.
> + */
> } else if (isp->revision == ISP_REVISION_15_0) {
> ccp2->phy = &isp->isp_csiphy1;
> }
> diff --git a/drivers/media/platform/omap3isp/ispcsiphy.c b/drivers/media/platform/omap3isp/ispcsiphy.c
> index 871d4fe..897097b 100644
> --- a/drivers/media/platform/omap3isp/ispcsiphy.c
> +++ b/drivers/media/platform/omap3isp/ispcsiphy.c
> @@ -68,8 +68,8 @@ static void csiphy_routing_cfg_3630(struct isp_csiphy *phy,
> regmap_write(phy->isp->syscon, phy->isp->syscon_offset, reg);
> }
>
> -static void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
> - bool ccp2_strobe)
> +void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
> + bool ccp2_strobe, bool strobe_clk_pol)
> {
> u32 csirxfe = OMAP343X_CONTROL_CSIRXFE_PWRDNZ
> | OMAP343X_CONTROL_CSIRXFE_RESET;
> @@ -85,6 +85,9 @@ static void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
>
> if (ccp2_strobe)
> csirxfe |= OMAP343X_CONTROL_CSIRXFE_SELFORM;
> +
> + if (strobe_clk_pol)
> + csirxfe |= OMAP343X_CONTROL_CSIRXFE_CSIB_INV;
>
> regmap_write(phy->isp->syscon, phy->isp->syscon_offset, csirxfe);
> }
> @@ -108,7 +111,7 @@ static void csiphy_routing_cfg(struct isp_csiphy *phy,
> if (phy->isp->phy_type == ISP_PHY_TYPE_3630 && on)
> return csiphy_routing_cfg_3630(phy, iface, ccp2_strobe);
> if (phy->isp->phy_type == ISP_PHY_TYPE_3430)
> - return csiphy_routing_cfg_3430(phy, iface, on, ccp2_strobe);
> + return csiphy_routing_cfg_3430(phy, iface, on, ccp2_strobe, false);
> }
>
> /*
> diff --git a/drivers/media/platform/omap3isp/ispcsiphy.h b/drivers/media/platform/omap3isp/ispcsiphy.h
> index 28b63b2..88c5c1e8 100644
> --- a/drivers/media/platform/omap3isp/ispcsiphy.h
> +++ b/drivers/media/platform/omap3isp/ispcsiphy.h
> @@ -40,4 +40,7 @@ int omap3isp_csiphy_acquire(struct isp_csiphy *phy);
> void omap3isp_csiphy_release(struct isp_csiphy *phy);
> int omap3isp_csiphy_init(struct isp_device *isp);
>
> +void csiphy_routing_cfg_3430(struct isp_csiphy *phy, u32 iface, bool on,
> + bool ccp2_strobe, bool strobe_clk_pol);
> +
> #endif /* OMAP3_ISP_CSI_PHY_H */
>
>
>
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@....fi XMPP: sailus@...iisi.org.uk
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