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From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: Dillon Min <dillon.minfei@gmail.com>
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 12:04:21 +0200	[thread overview]
Message-ID: <8331ab8a-39b7-588c-146d-77197d7637a8@xs4all.nl> (raw)
In-Reply-To: <CAL9mu0KxAmULQofQMgt2JxVLs=L-YT5HZa+mA7sSKebG88GbcA@mail.gmail.com>

On 11/10/2021 12:00, Dillon Min wrote:
> 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.

Yes, that looks OK to me.

Regards,

	Hans

> 
> 
>>
>> 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: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: Dillon Min <dillon.minfei@gmail.com>
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 12:04:21 +0200	[thread overview]
Message-ID: <8331ab8a-39b7-588c-146d-77197d7637a8@xs4all.nl> (raw)
In-Reply-To: <CAL9mu0KxAmULQofQMgt2JxVLs=L-YT5HZa+mA7sSKebG88GbcA@mail.gmail.com>

On 11/10/2021 12:00, Dillon Min wrote:
> 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.

Yes, that looks OK to me.

Regards,

	Hans

> 
> 
>>
>> 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 */
>>>
>>>
>>


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  reply	other threads:[~2021-10-11 10:04 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
2021-10-11 10:00       ` Dillon Min
2021-10-11 10:04       ` Hans Verkuil [this message]
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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