[PATCH v3 03/19] drm: add msm compressed format modifiers

[Jeykumar Sankaran]

On 2018-07-25 07:09, Stanimir Varbanov wrote:
> Hi,
> 
> On 07/20/2018 11:42 PM, Sean Paul wrote:
>> From: Jeykumar Sankaran <jsanka at codeaurora.org>
>> 
>> Qualcomm Snapdragon chipsets uses compressed format
>> to optimize BW across multiple IP's. This change adds
>> needed modifier support in drm for a simple 4x4 tile
>> based compressed variants of base formats.
>> 
>> Changes in v3:
>> - Removed duplicate entry for DRM_FORMAT_MOD_QCOM_COMPRESSED (Rob 
>> Clark)
>> 
>> Signed-off-by: Jeykumar Sankaran <jsanka at codeaurora.org>
>> Signed-off-by: Sean Paul <seanpaul at chromium.org>
>> ---
>>  include/uapi/drm/drm_fourcc.h | 37 
>> +++++++++++++++++++++++++++++++++++
>>  1 file changed, 37 insertions(+)
>> 
>> diff --git a/include/uapi/drm/drm_fourcc.h 
>> b/include/uapi/drm/drm_fourcc.h
>> index e04613d30a13..1c9a6bf8c81e 100644
>> --- a/include/uapi/drm/drm_fourcc.h
>> +++ b/include/uapi/drm/drm_fourcc.h
>> @@ -298,6 +298,43 @@ extern "C" {
>>   */
>>  #define DRM_FORMAT_MOD_SAMSUNG_64_32_TILE	fourcc_mod_code(SAMSUNG, 1)
>> 
>> +/*
>> + * Qualcomm Compressed Format
>> + *
>> + * Refers to a compressed variant of the base format that is 
>> compressed.
>> + * Implementation may be platform and base-format specific.
>> + *
>> + * Each macrotile consists of m x n (mostly 4 x 4) tiles.
>> + * Pixel data pitch/stride is aligned with macrotile width.
>> + * Pixel data height is aligned with macrotile height.
>> + * Entire pixel data buffer is aligned with 4k(bytes).
>> + */
>> +#define DRM_FORMAT_MOD_QCOM_COMPRESSED	fourcc_mod_code(QCOM, 1)
>> +
>> +/*
>> + * QTI DX Format
>> + *
>> + * Refers to a DX variant of the base format.
>> + * Implementation may be platform and base-format specific.
>> + */
>> +#define DRM_FORMAT_MOD_QCOM_DX	fourcc_mod_code(QCOM, 0x2)
> 
> What DX stands for?

_DX is QCOM modifier for identifying 10bit version of NV12 format since 
there is no fourcc_code for the same.

-- 
Jeykumar S