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SubjectRe: [PATCH v2] drm/color: Document CTM eqations
Hi Jani,

On Tue, Jan 31, 2017 at 01:30:41PM +0200, Jani Nikula wrote:
>On Tue, 31 Jan 2017, Brian Starkey <brian.starkey@arm.com> wrote:
>> Explicitly state the expected CTM equations in the kerneldoc for the CTM
>> property, and the form of the matrix on struct drm_color_ctm.
>>
>> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
>> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
>> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
>> Signed-off-by: Brian Starkey <brian.starkey@arm.com>
>> ---
>> drivers/gpu/drm/drm_color_mgmt.c | 13 +++++++++++++
>> include/uapi/drm/drm_mode.h | 8 +++++++-
>> 2 files changed, 20 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
>> index 789b4c65cd69..7573ca4b6ea6 100644
>> --- a/drivers/gpu/drm/drm_color_mgmt.c
>> +++ b/drivers/gpu/drm/drm_color_mgmt.c
>> @@ -62,6 +62,19 @@
>> * unit/pass-thru matrix should be used. This is generally the driver
>> * boot-up state too.
>> *
>> + * The output vector is related to the input vector as below:
>> + *
>> + * | ``out[0] = matrix[0] * in[0] + matrix[1] * in[1] + matrix[2] * in[2];``
>> + * | ``out[1] = matrix[3] * in[0] + matrix[4] * in[1] + matrix[5] * in[2];``
>> + * | ``out[2] = matrix[6] * in[0] + matrix[7] * in[1] + matrix[8] * in[2];``
>
>Would that not work better with a preformatted block? Replace the colon
>in the preceding paragraph with the double colon ::, and indent the
>block.
>

Ah thanks for the tip, I couldn't get it to work but it looks like my
syntax was a bit off. I'll resend with that change.

>> + *
>> + * The component order in the input/output vectors is assumed to be
>> + * { R, G, B }.
>> + *
>> + * The color-space of the input vector must not be confused with the
>> + * color-space implied by a framebuffer pixel format, which may be the same
>> + * or different.
>> + *
>> * “GAMMA_LUT”:
>> * Blob property to set the gamma lookup table (LUT) mapping pixel data
>> * after the transformation matrix to data sent to the connector. The
>> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
>> index ce7efe2e8a5e..3401637caf8e 100644
>> --- a/include/uapi/drm/drm_mode.h
>> +++ b/include/uapi/drm/drm_mode.h
>> @@ -525,7 +525,13 @@ struct drm_mode_crtc_lut {
>> };
>>
>> struct drm_color_ctm {
>> - /* Conversion matrix in S31.32 format. */
>> + /*
>> + * Conversion matrix in S31.32 format, in row-major form:
>> + *
>> + * | matrix[0] matrix[1] matrix[2] |
>> + * | matrix[3] matrix[4] matrix[5] |
>> + * | matrix[6] matrix[7] matrix[8] |
>> + */
>
>Same here.

This comment isn't actually kerneldoc, so I guess not rst either.
I can include the markup if you like, but the |s here were to indicate
it's a matrix rather than for rst.

Cheers,
-Brian

>
>> __s64 matrix[9];
>> };
>
>--
>Jani Nikula, Intel Open Source Technology Center

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