Hi,
> -----Original Message-----
> From: ext Laurent Pinchart [mailto:laurent.pinch...@ideasonboard.com]
> Sent: 29. huhtikuuta 2011 12:49
> To: Jokiniemi Kalle (Nokia-SD/Tampere)
> Cc: t...@atomide.com; mche...@infradead.org; linux-
> o...@vger.kernel.org; linux-me...@vger.kernel.org
> Subject: Re: [PATCH 1/2] OMAP3: ISP: Add regulator control for omap34xx
>
> Hi Kalle,
>
> On Friday 29 April 2011 09:11:59 Kalle Jokiniemi wrote:
> > The current omap3isp driver is missing regulator handling
> > for CSIb complex in omap34xx based devices. This patch
> > adds a mechanism for this to the omap3isp driver.
> >
> > Signed-off-by: Kalle Jokiniemi <kalle.jokini...@nokia.com>
>
> Thanks for the patch.
No problem, thanks for the comments. Good comments, I'll spin another
patch after weekend to address the issues.
- Kalle
>
> The CSIb pins are multiplexed with the parallel interface cam_d[6:9] signals,
> so the driver might need to handle the vdds_csib regulator for the parallel
> interface as well. We can leave that out now though, as I'm not sure we'll
> ever see a platform that will require that.
>
> > ---
> > drivers/media/video/omap3isp/ispccp2.c | 24
> +++++++++++++++++++++++-
> > drivers/media/video/omap3isp/ispccp2.h | 1 +
> > 2 files changed, 24 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/media/video/omap3isp/ispccp2.c
> > b/drivers/media/video/omap3isp/ispccp2.c index 0e16cab..3b17b0d 100644
> > --- a/drivers/media/video/omap3isp/ispccp2.c
> > +++ b/drivers/media/video/omap3isp/ispccp2.c
> > @@ -30,6 +30,7 @@
> > #include <linux/module.h>
> > #include <linux/mutex.h>
> > #include <linux/uaccess.h>
> > +#include <linux/regulator/consumer.h>
> >
> > #include "isp.h"
> > #include "ispreg.h"
> > @@ -163,6 +164,9 @@ static void ccp2_if_enable(struct isp_ccp2_device
> > *ccp2, u8 enable) struct isp_pipeline *pipe =
> > to_isp_pipeline(&ccp2->subdev.entity); int i;
> >
> > + if (enable && ccp2->vdds_csib)
> > + regulator_enable(ccp2->vdds_csib);
> > +
> > /* 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),
> > @@ -186,6 +190,8 @@ static void ccp2_if_enable(struct isp_ccp2_device
> > *ccp2, u8 enable) ISPCCP2_LC01_IRQENABLE,
> > ISPCCP2_LC01_IRQSTATUS_LC0_FS_IRQ);
> > }
>
> If you resubmit the patch to address the comments below, please add a blank
> line here.
>
> > + if (!enable && ccp2->vdds_csib)
> > + regulator_disable(ccp2->vdds_csib);
> > }
> >
> > /*
> > @@ -1137,6 +1143,10 @@ error:
> > */
> > void omap3isp_ccp2_cleanup(struct isp_device *isp)
> > {
> > + struct isp_ccp2_device *ccp2 = &isp->isp_ccp2;
> > +
> > + if (isp->revision == ISP_REVISION_2_0)
> > + regulator_put(ccp2->vdds_csib);
>
> What about testing ccp2->vdds_csib != NULL here like you do above ? Not all
> ES2.0 platforms will use a regulator, so you can end up calling
> regulator_put(NULL). regulator_put() will return immediately, but the API
> doesn't allow it explictly either.
>
> If regulator_put(NULL) is deemed to be safe, I would remove the revision
> check
> here. If it isn't, I would replace it with a ccp2->vdds_csib != NULL check.
>
> > }
> >
> > /*
> > @@ -1155,10 +1165,22 @@ int omap3isp_ccp2_init(struct isp_device *isp)
> > * the CSI2c or CSI2a receivers. The PHY then needs to be explicitly
> > * configured.
> > *
> > + * On the OMAP34xx the CSI1/CCB is operated in the CSIb IO complex,
>
> CSI1/CCB ? Do you mean CCP ?
>
> The OMAP34xx has no CCP2 support anyway, so I would s,CSI1/CCB,CSI1
> receiver,.
>
> > + * which is powered by vdds_csib power rail. Hence the request for
> > + * the regulator.
> > + *
> > * TODO: Don't hardcode the usage of PHY1 (shared with CSI2c).
> > */
> > - if (isp->revision == ISP_REVISION_15_0)
> > + if (isp->revision == ISP_REVISION_15_0) {
> > ccp2->phy = &isp->isp_csiphy1;
> > + } else if (isp->revision == ISP_REVISION_2_0) {
> > + ccp2->vdds_csib = regulator_get(isp->dev, "vdds_csib");
> > + if (IS_ERR(ccp2->vdds_csib)) {
> > + dev_dbg(isp->dev,
> > + "Could not get regulator vdds_csib\n");
> > + ccp2->vdds_csib = NULL;
> > + }
> > + }
>
> If you resubmit your patch to address the above comments, could you please
> reorder the code (and the comment) here and put the ES2.0 check before the
> 15.0 ?
>
> > ret = ccp2_init_entities(ccp2);
> > if (ret < 0)
> > diff --git a/drivers/media/video/omap3isp/ispccp2.h
> > b/drivers/media/video/omap3isp/ispccp2.h index 5505a86..6674e9d 100644
> > --- a/drivers/media/video/omap3isp/ispccp2.h
> > +++ b/drivers/media/video/omap3isp/ispccp2.h
> > @@ -81,6 +81,7 @@ struct isp_ccp2_device {
> > struct isp_interface_mem_config mem_cfg;
> > struct isp_video video_in;
> > struct isp_csiphy *phy;
> > + struct regulator *vdds_csib;
> > unsigned int error;
> > enum isp_pipeline_stream_state state;
> > wait_queue_head_t wait;
>
> --
> Regards,
>
> Laurent Pinchart
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