linux-kernel - Re: [PATCH v5 1/8] drm/fourcc: Add modifier definitions for describing Amlogic Video Framebuffer Compression

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Message-ID: <25f5ed14-2caf-6b2b-2cd4-3dbf0dd9a03c@baylibre.com>
Date:   Mon, 20 Apr 2020 12:21:24 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-amlogic@...ts.infradead.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH v5 1/8] drm/fourcc: Add modifier definitions for
 describing Amlogic Video Framebuffer Compression

On 17/04/2020 20:14, Daniel Vetter wrote:
> On Fri, Apr 17, 2020 at 6:05 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> On 17/04/2020 17:07, Daniel Vetter wrote:

[...]

> 
> Yup there's a number of parametried modifiers. As long as the stuff
> you get from a DRM_FORMAT_MOD_ ... macro is a full modifier with
> everything it should be all fine.

Would something like that be ok ?

#define __fourcc_mod_amlogic_layout_mask 0xf
#define __fourcc_mod_amlogic_options_shift 8
#define __fourcc_mod_amlogic_options_mask 0xf

#define DRM_FORMAT_MOD_AMLOGIC_FBC(__layout, __options) \
	fourcc_mod_code(AMLOGIC, \
			((__layout) & __fourcc_mod_amlogic_layout_mask) | \
			((options) & __fourcc_mod_amlogic_options_mask \
			 << __fourcc_mod_amlogic_options_shift))

/* Amlogic FBC Layouts */

/* bla */
#define AMLOGIC_FBC_LAYOUT_BASIC		(1ULL)

/* bla */
#define AMLOGIC_FBC_LAYOUT_SCATTER		(2ULL)

/* Amlogic FBC Layout Options Bit Mask */

/* bla */
#define AMLOGIC_FBC_OPTION_MEM_SAVING		(1ULL << 0)

Neil

> -Daniel
> 
>> Neil
>>
>>> -Daniel
>>>
>>>> +
>>>>  #if defined(__cplusplus)
>>>>  }
>>>>  #endif
>>>> --
>>>> 2.22.0
>>>>
>>>
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> 
> 

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