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Message-ID: <20200915000140.GA1698816@oden.dyn.berto.se>
Date: Tue, 15 Sep 2020 02:01:40 +0200
From: Niklas Söderlund
<niklas.soderlund@...natech.se>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH v3] media: rcar-vin: Enable YDS bit depending on
bus_width and data_shift
Hi Lad,
Thanks for your work.
On 2020-09-15 02:45:32 +0300, Laurent Pinchart wrote:
> Hi Prabhakar,
>
> Thank you for the patch.
>
> On Sun, Sep 13, 2020 at 07:16:08PM +0100, Lad Prabhakar wrote:
> > Enable YDS bit if bus_width and data_shift is set to 8 in parallel mode
> > for MEDIA_BUS_FMT_UYVY8_2X8 format.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> > Changes for v3:
> > * Dropped BIT macro
> > * Introduced struct v4l2_fwnode_bus_parallel
> >
> > Changes for v2:
> > * Dropped DT binding documentation patch
> > * Select the data pins depending on bus-width and data-shift
> >
> > v1 -
> > https://patchwork.kernel.org/project/linux-renesas-soc/list/?series=323799
> > ---
> > drivers/media/platform/rcar-vin/rcar-core.c | 9 ++++-----
> > drivers/media/platform/rcar-vin/rcar-dma.c | 17 ++++++++++++++---
> > drivers/media/platform/rcar-vin/rcar-vin.h | 5 +++--
> > 3 files changed, 21 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
> > index 7440c8965d27..1149ab76cf5c 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-core.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-core.c
> > @@ -626,12 +626,11 @@ static int rvin_parallel_parse_v4l2(struct device *dev,
> >
> > switch (vin->parallel->mbus_type) {
> > case V4L2_MBUS_PARALLEL:
> > - vin_dbg(vin, "Found PARALLEL media bus\n");
> > - vin->parallel->mbus_flags = vep->bus.parallel.flags;
> > - break;
> > case V4L2_MBUS_BT656:
> > - vin_dbg(vin, "Found BT656 media bus\n");
> > - vin->parallel->mbus_flags = 0;
> > + vin_dbg(vin, "Found %s media bus\n",
> > + vin->parallel->mbus_type == V4L2_MBUS_PARALLEL ?
> > + "PARALLEL" : "BT656");
>
> I'd write "parallel" and "BT.656".
I agree with this change.
>
> > + vin->parallel->bus = vep->bus.parallel;
> > break;
> > default:
> > vin_err(vin, "Unknown media bus type\n");
> > diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
> > index a5dbb90c5210..d067439b0b0d 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-dma.c
> > +++ b/drivers/media/platform/rcar-vin/rcar-dma.c
> > @@ -125,6 +125,7 @@
> > #define VNDMR2_VPS (1 << 30)
> > #define VNDMR2_HPS (1 << 29)
> > #define VNDMR2_CES (1 << 28)
> > +#define VNDMR2_YDS (1 << 22)
> > #define VNDMR2_FTEV (1 << 17)
> > #define VNDMR2_VLV(n) ((n & 0xf) << 12)
> >
> > @@ -698,16 +699,26 @@ static int rvin_setup(struct rvin_dev *vin)
> >
> > if (!vin->is_csi) {
> > /* Hsync Signal Polarity Select */
> > - if (!(vin->parallel->mbus_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW))
> > + if (!(vin->parallel->bus.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW))
> > dmr2 |= VNDMR2_HPS;
> >
> > /* Vsync Signal Polarity Select */
> > - if (!(vin->parallel->mbus_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW))
> > + if (!(vin->parallel->bus.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW))
> > dmr2 |= VNDMR2_VPS;
> >
> > /* Data Enable Polarity Select */
> > - if (vin->parallel->mbus_flags & V4L2_MBUS_DATA_ENABLE_LOW)
> > + if (vin->parallel->bus.flags & V4L2_MBUS_DATA_ENABLE_LOW)
> > dmr2 |= VNDMR2_CES;
> > +
> > + switch (vin->mbus_code) {
> > + case MEDIA_BUS_FMT_UYVY8_2X8:
> > + if (vin->parallel->bus.bus_width == 8 &&
>
> You can possibly drop this check, as UYVY8_2X8 implies a bus_width equal
> to 8. Apart from that,
I agree here as well, I think the check for UYVY8_2X8 may be dropped.
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> > + vin->parallel->bus.data_shift == 8)
> > + dmr2 |= VNDMR2_YDS;
> > + break;
> > + default:
> > + break;
> > + }
> > }
> >
> > /*
> > diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
> > index c19d077ce1cb..8396e0e45478 100644
> > --- a/drivers/media/platform/rcar-vin/rcar-vin.h
> > +++ b/drivers/media/platform/rcar-vin/rcar-vin.h
> > @@ -19,6 +19,7 @@
> > #include <media/v4l2-ctrls.h>
> > #include <media/v4l2-dev.h>
> > #include <media/v4l2-device.h>
> > +#include <media/v4l2-fwnode.h>
> > #include <media/videobuf2-v4l2.h>
> >
> > /* Number of HW buffers */
> > @@ -92,7 +93,7 @@ struct rvin_video_format {
> > * @asd: sub-device descriptor for async framework
> > * @subdev: subdevice matched using async framework
> > * @mbus_type: media bus type
> > - * @mbus_flags: media bus configuration flags
> > + * @bus: media bus parallel configuration
> > * @source_pad: source pad of remote subdevice
> > * @sink_pad: sink pad of remote subdevice
> > *
> > @@ -102,7 +103,7 @@ struct rvin_parallel_entity {
> > struct v4l2_subdev *subdev;
> >
> > enum v4l2_mbus_type mbus_type;
> > - unsigned int mbus_flags;
> > + struct v4l2_fwnode_bus_parallel bus;
I think you could break this change (and the fallout) out to a separate
patch to make the functional change clearer.
> >
> > unsigned int source_pad;
> > unsigned int sink_pad;
>
> --
> Regards,
>
> Laurent Pinchart
--
Regards,
Niklas Söderlund
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