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From: Dillon Min <dillon.minfei@gmail.com>
To: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	mchehab+huawei@kernel.org, ezequiel@collabora.com,
	gnurou@gmail.com, Pi-Hsun Shih <pihsun@chromium.org>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre TORGUE <alexandre.torgue@foss.st.com>,
	Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>, Rob Herring <robh+dt@kernel.org>,
	gabriel.fernandez@st.com, gabriel.fernandez@foss.st.com,
	Patrice CHOTARD <patrice.chotard@foss.st.com>,
	hugues.fruchet@foss.st.com,
	linux-media <linux-media@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-stm32@st-md-mailman.stormreply.com,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>
Subject: Re: [PATCH v3 6/8] media: v4l2-ctrls: Add ARGB color effects control
Date: Mon, 11 Oct 2021 18:00:21 +0800	[thread overview]
Message-ID: <CAL9mu0KxAmULQofQMgt2JxVLs=L-YT5HZa+mA7sSKebG88GbcA@mail.gmail.com> (raw)
In-Reply-To: <290d78b5-b6d4-a115-9556-f2f909f573da@xs4all.nl>

Hi Hans

Thanks for the quick reply.

On Mon, 11 Oct 2021 at 17:40, Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote:
>
> On 08/10/2021 12:30, dillon.minfei@gmail.com wrote:
> > From: Dillon Min <dillon.minfei@gmail.com>
> >
> > - add V4L2_COLORFX_SET_ARGB color effects control.
> > - add V4L2_CID_COLORFX_ARGB for ARGB color setting.
> >
> > Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
> > ---
> > v3: according to Hans's suggestion, thanks.
> > - remove old stm32 private R2M ioctl
> > - add V4L2_CID_COLORFX_ARGB
> > - add V4L2_COLORFX_SET_ARGB
> >
> >  Documentation/userspace-api/media/v4l/control.rst | 8 ++++++++
> >  drivers/media/v4l2-core/v4l2-ctrls-defs.c         | 2 ++
> >  include/uapi/linux/v4l2-controls.h                | 4 +++-
> >  3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/control.rst b/Documentation/userspace-api/media/v4l/control.rst
> > index f8d0b923da20..319606a6288f 100644
> > --- a/Documentation/userspace-api/media/v4l/control.rst
> > +++ b/Documentation/userspace-api/media/v4l/control.rst
> > @@ -242,8 +242,16 @@ 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_ARGB``
> > +      - ARGB colors.
>
> How about:
>
>         - The ARGB components are replaced by the fixed ARGB components
>         determined by ``V4L2_CID_COLORFX_ARGB`` control.

Sure, will be addressed by v4.

>
> I also wonder if it makes sense to include the alpha channel here.
>
> Looking at the driver code it appears to me (I might be wrong) that the alpha
> channel is never touched (DMA2D_ALPHA_MODE_NO_MODIF), and setting the alpha
> channel as part of a color effects control is rather odd as well.

Indeed, Alpha channel is not used in current code. I'll remove this item in v4.
how about change the code like below:

    * - ``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.


>
> Alpha channel manipulation really is separate from the color and - if needed - should
> be done with a separate control.

OK, Will use a separate control when adding blend features.

Best Regards,
Dillon

>
> Regards,
>
>         Hans
>
> >
> >
> > +``V4L2_CID_COLORFX_ARGB`` ``(integer)``
> > +    Determines the Alpha, Red, Green, and Blue coefficients for
> > +    ``V4L2_COLORFX_SET_ARGB`` 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] as Alpha component.
> >
> >  ``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..53be6aadb289 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_ARGB:             return "Color Effects, ARGB";
> >
> >       /*
> >        * 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_ARGB:
> >               *type = V4L2_CTRL_TYPE_INTEGER;
> >               *step = 1;
> >               *min = 0;
> > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> > index 5532b5f68493..2876c2282a68 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_ARGB                   = 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_ARGB                        (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 */
> >
> >
>

WARNING: multiple messages have this Message-ID
From: Dillon Min <dillon.minfei@gmail.com>
To: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>,
	mchehab+huawei@kernel.org, ezequiel@collabora.com,
	 gnurou@gmail.com, Pi-Hsun Shih <pihsun@chromium.org>,
	 Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre TORGUE <alexandre.torgue@foss.st.com>,
	 Michael Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@kernel.org>,
	 Rob Herring <robh+dt@kernel.org>,
	gabriel.fernandez@st.com,  gabriel.fernandez@foss.st.com,
	Patrice CHOTARD <patrice.chotard@foss.st.com>,
	 hugues.fruchet@foss.st.com,
	linux-media <linux-media@vger.kernel.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-stm32@st-md-mailman.stormreply.com,
	 Linux ARM <linux-arm-kernel@lists.infradead.org>,
	 linux-clk <linux-clk@vger.kernel.org>,
	 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>
Subject: Re: [PATCH v3 6/8] media: v4l2-ctrls: Add ARGB color effects control
Date: Mon, 11 Oct 2021 18:00:21 +0800	[thread overview]
Message-ID: <CAL9mu0KxAmULQofQMgt2JxVLs=L-YT5HZa+mA7sSKebG88GbcA@mail.gmail.com> (raw)
In-Reply-To: <290d78b5-b6d4-a115-9556-f2f909f573da@xs4all.nl>

Hi Hans

Thanks for the quick reply.

On Mon, 11 Oct 2021 at 17:40, Hans Verkuil <hverkuil-cisco@xs4all.nl> wrote:
>
> On 08/10/2021 12:30, dillon.minfei@gmail.com wrote:
> > From: Dillon Min <dillon.minfei@gmail.com>
> >
> > - add V4L2_COLORFX_SET_ARGB color effects control.
> > - add V4L2_CID_COLORFX_ARGB for ARGB color setting.
> >
> > Signed-off-by: Dillon Min <dillon.minfei@gmail.com>
> > ---
> > v3: according to Hans's suggestion, thanks.
> > - remove old stm32 private R2M ioctl
> > - add V4L2_CID_COLORFX_ARGB
> > - add V4L2_COLORFX_SET_ARGB
> >
> >  Documentation/userspace-api/media/v4l/control.rst | 8 ++++++++
> >  drivers/media/v4l2-core/v4l2-ctrls-defs.c         | 2 ++
> >  include/uapi/linux/v4l2-controls.h                | 4 +++-
> >  3 files changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/control.rst b/Documentation/userspace-api/media/v4l/control.rst
> > index f8d0b923da20..319606a6288f 100644
> > --- a/Documentation/userspace-api/media/v4l/control.rst
> > +++ b/Documentation/userspace-api/media/v4l/control.rst
> > @@ -242,8 +242,16 @@ 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_ARGB``
> > +      - ARGB colors.
>
> How about:
>
>         - The ARGB components are replaced by the fixed ARGB components
>         determined by ``V4L2_CID_COLORFX_ARGB`` control.

Sure, will be addressed by v4.

>
> I also wonder if it makes sense to include the alpha channel here.
>
> Looking at the driver code it appears to me (I might be wrong) that the alpha
> channel is never touched (DMA2D_ALPHA_MODE_NO_MODIF), and setting the alpha
> channel as part of a color effects control is rather odd as well.

Indeed, Alpha channel is not used in current code. I'll remove this item in v4.
how about change the code like below:

    * - ``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.


>
> Alpha channel manipulation really is separate from the color and - if needed - should
> be done with a separate control.

OK, Will use a separate control when adding blend features.

Best Regards,
Dillon

>
> Regards,
>
>         Hans
>
> >
> >
> > +``V4L2_CID_COLORFX_ARGB`` ``(integer)``
> > +    Determines the Alpha, Red, Green, and Blue coefficients for
> > +    ``V4L2_COLORFX_SET_ARGB`` 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] as Alpha component.
> >
> >  ``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..53be6aadb289 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_ARGB:             return "Color Effects, ARGB";
> >
> >       /*
> >        * 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_ARGB:
> >               *type = V4L2_CTRL_TYPE_INTEGER;
> >               *step = 1;
> >               *min = 0;
> > diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> > index 5532b5f68493..2876c2282a68 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_ARGB                   = 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_ARGB                        (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 */
> >
> >
>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-10-11 10:01 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-08 10:30 [PATCH v3 0/8] Add support for DMA2D of STMicroelectronics STM32 Soc series dillon.minfei
2021-10-08 10:30 ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 1/8] media: admin-guide: add stm32-dma2d description dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 2/8] media: dt-bindings: media: add document for STM32 DMA2d bindings dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 3/8] ARM: dts: stm32: Add DMA2D support for STM32F429 series soc dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 4/8] ARM: dts: stm32: Enable DMA2D on STM32F469-DISCO board dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 5/8] media: v4l2-mem2mem: add v4l2_m2m_get_unmapped_area for no-mmu platform dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 6/8] media: v4l2-ctrls: Add ARGB color effects control dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-11  9:40   ` Hans Verkuil
2021-10-11  9:40     ` Hans Verkuil
2021-10-11 10:00     ` Dillon Min [this message]
2021-10-11 10:00       ` Dillon Min
2021-10-11 10:04       ` Hans Verkuil
2021-10-11 10:04         ` Hans Verkuil
2021-10-11 12:06         ` Dillon Min
2021-10-11 12:06           ` Dillon Min
2021-10-08 10:30 ` [PATCH v3 7/8] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after enter shell dillon.minfei
2021-10-08 10:30   ` dillon.minfei
2021-10-08 10:30 ` [PATCH v3 8/8] media: stm32-dma2d: STM32 DMA2D driver dillon.minfei
2021-10-08 10:30   ` dillon.minfei

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