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Date: Thu, 14 Oct 2021 18:53:02 +0800
From: Dillon Min <dillon.minfei@...il.com>
To: Hans Verkuil <hverkuil-cisco@...all.nl>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
mchehab+huawei@...nel.org, ezequiel@...labora.com,
gnurou@...il.com, Pi-Hsun Shih <pihsun@...omium.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre TORGUE <alexandre.torgue@...s.st.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh+dt@...nel.org>, gabriel.fernandez@...com,
gabriel.fernandez@...s.st.com,
Patrice CHOTARD <patrice.chotard@...s.st.com>,
hugues.fruchet@...s.st.com,
linux-media <linux-media@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-stm32@...md-mailman.stormreply.com,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
linux-clk <linux-clk@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 6/8] media: v4l2-ctrls: Add RGB color effects control
Hi Hans
Thanks for quick reply
On Thu, 14 Oct 2021 at 18:44, Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>
> On 14/10/2021 12:25, dillon.minfei@...il.com wrote:
> > From: Dillon Min <dillon.minfei@...il.com>
> >
> > Add V4L2_COLORFX_SET_RGB color effects control, V4L2_CID_COLORFX_RGB
> > for RGB color setting.
> >
> > Signed-off-by: Dillon Min <dillon.minfei@...il.com>
> > ---
> > v4:
> > - replace V4L2_COLORFX_SET_ARGB, V4L2_CID_COLORFX_ARGB to
> > V4L2_COLORFX_SET_RGB, V4L2_CID_COLORFX_RGB since Alpha paramter not used
> > in current. thanks Hans.
> >
> > Documentation/userspace-api/media/v4l/control.rst | 9 +++++++++
> > drivers/media/v4l2-core/v4l2-ctrls-defs.c | 2 ++
> > include/uapi/linux/v4l2-controls.h | 4 +++-
> > 3 files changed, 14 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/control.rst b/Documentation/userspace-api/media/v4l/control.rst
> > index f8d0b923da20..3eec65174260 100644
> > --- a/Documentation/userspace-api/media/v4l/control.rst
> > +++ b/Documentation/userspace-api/media/v4l/control.rst
> > @@ -242,8 +242,17 @@ Control IDs
> > * - ``V4L2_COLORFX_SET_CBCR``
> > - The Cb and Cr chroma components are replaced by fixed coefficients
> > determined by ``V4L2_CID_COLORFX_CBCR`` control.
> > + * - ``V4L2_COLORFX_SET_RGB``
> > + - The RGB components are replaced by the fixed RGB components determined
> > + by ``V4L2_CID_COLORFX_RGB`` control.
> >
> >
> > +``V4L2_CID_COLORFX_RGB`` ``(integer)``
> > + Determines the Red, Green, and Blue coefficients for
> > + ``V4L2_COLORFX_SET_RGB`` color effect.
> > + Bits [7:0] of the supplied 32 bit value are interpreted as Blue component,
> > + bits [15:8] as Green component, bits [23:16] as Red component, and
> > + bits [31:24] must be zero.
> >
> > ``V4L2_CID_COLORFX_CBCR`` ``(integer)``
> > Determines the Cb and Cr coefficients for ``V4L2_COLORFX_SET_CBCR``
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> > index 421300e13a41..f4bd90170105 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
> > @@ -785,6 +785,7 @@ const char *v4l2_ctrl_get_name(u32 id)
> > case V4L2_CID_MIN_BUFFERS_FOR_OUTPUT: return "Min Number of Output Buffers";
> > case V4L2_CID_ALPHA_COMPONENT: return "Alpha Component";
> > case V4L2_CID_COLORFX_CBCR: return "Color Effects, CbCr";
> > + case V4L2_CID_COLORFX_RGB: return "Color Effects, RGB";
> >
> > /*
> > * Codec controls
> > @@ -1392,6 +1393,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> > *min = *max = *step = *def = 0;
> > break;
> > case V4L2_CID_BG_COLOR:
> > + case V4L2_CID_COLORFX_RGB:
> > *type = V4L2_CTRL_TYPE_INTEGER;
> > *step = 1;
> > *min = 0;
>
> Can you make another small change here? Please change:
>
> *max = 0xFFFFFF;
>
> to:
>
> *max = 0xffffff;
>
> to keep in line with the coding standard for hex values.
Sure, do it right now.
>
> Also, can you add a separate patch that adds an entry here for V4L2_CID_COLORFX_CBCR
> that sets *max to 0xffff? I noticed that that was missing. While adding V4L2_CID_COLORFX_RGB
> it's good to fix V4L2_CID_COLORFX_CBCR as well.
Sure, you mean the final code like this? first patch to fix cbcr 0xFFFFFF,
another one to add V4L2_CID_COLORFX_RGB entry.
1395 case V4L2_CID_BG_COLOR:
1396 case V4L2_CID_COLORFX_RGB:
1397 *type = V4L2_CTRL_TYPE_INTEGER;
1398 *step = 1;
1399 *min = 0;
1400 /* Max is calculated as RGB888 that is 2^24 */
1401 *max = 0xffffff;
1402 break;
Best Regards
Dillon
>
> Regards,
>
> Hans
>
> > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> > index 5532b5f68493..9aa3fd368383 100644
> > --- a/include/uapi/linux/v4l2-controls.h
> > +++ b/include/uapi/linux/v4l2-controls.h
> > @@ -128,6 +128,7 @@ enum v4l2_colorfx {
> > V4L2_COLORFX_SOLARIZATION = 13,
> > V4L2_COLORFX_ANTIQUE = 14,
> > V4L2_COLORFX_SET_CBCR = 15,
> > + V4L2_COLORFX_SET_RGB = 16,
> > };
> > #define V4L2_CID_AUTOBRIGHTNESS (V4L2_CID_BASE+32)
> > #define V4L2_CID_BAND_STOP_FILTER (V4L2_CID_BASE+33)
> > @@ -145,9 +146,10 @@ enum v4l2_colorfx {
> >
> > #define V4L2_CID_ALPHA_COMPONENT (V4L2_CID_BASE+41)
> > #define V4L2_CID_COLORFX_CBCR (V4L2_CID_BASE+42)
> > +#define V4L2_CID_COLORFX_RGB (V4L2_CID_BASE+43)
> >
> > /* last CID + 1 */
> > -#define V4L2_CID_LASTP1 (V4L2_CID_BASE+43)
> > +#define V4L2_CID_LASTP1 (V4L2_CID_BASE+44)
> >
> > /* USER-class private control IDs */
> >
> >
>
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