linux-kernel - Re: [PATCH 06/37] drm/vkms/vkms_composer: Fix a few different kerneldoc formatting

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Date:   Tue, 21 Mar 2023 08:49:59 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Lee Jones <lee@...nel.org>, dri-devel@...ts.freedesktop.org,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
        linux-kernel@...r.kernel.org, Melissa Wen <melissa.srw@...il.com>
Subject: Re: [PATCH 06/37] drm/vkms/vkms_composer: Fix a few different
 kerneldoc formatting

O 03/20, Randy Dunlap wrote:
> 
> 
> On 3/20/23 16:46, Melissa Wen wrote:
> > On 03/17, Lee Jones wrote:
> >> Fixes the following W=1 kernel build warning(s):
> >>
> >>  drivers/gpu/drm/vkms/vkms_composer.c:41: warning: Function parameter or member 'frame_info' not described in 'pre_mul_alpha_blend'
> >>  drivers/gpu/drm/vkms/vkms_composer.c:41: warning: Excess function parameter 'src_frame_info' description in 'pre_mul_alpha_blend'
> >>  drivers/gpu/drm/vkms/vkms_composer.c:72: warning: Cannot understand  * @wb_frame_info: The writeback frame buffer metadata
> >>
> >> Cc: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
> >> Cc: Melissa Wen <melissa.srw@...il.com>
> >> Cc: Haneen Mohammed <hamohammed.sa@...il.com>
> >> Cc: Daniel Vetter <daniel@...ll.ch>
> >> Cc: David Airlie <airlied@...il.com>
> >> Cc: dri-devel@...ts.freedesktop.org
> >> Signed-off-by: Lee Jones <lee@...nel.org>
> >> ---
> >>  drivers/gpu/drm/vkms/vkms_composer.c | 6 ++++--
> >>  1 file changed, 4 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c
> >> index 8e53fa80742b2..41668eedf4272 100644
> >> --- a/drivers/gpu/drm/vkms/vkms_composer.c
> >> +++ b/drivers/gpu/drm/vkms/vkms_composer.c
> >> @@ -22,7 +22,7 @@ static u16 pre_mul_blend_channel(u16 src, u16 dst, u16 alpha)
> >>  
> >>  /**
> >>   * pre_mul_alpha_blend - alpha blending equation
> >> - * @src_frame_info: source framebuffer's metadata
> >> + * @frame_info: source framebuffer's metadata
> >>   * @stage_buffer: The line with the pixels from src_plane
> >>   * @output_buffer: A line buffer that receives all the blends output
> >>   *
> >> @@ -69,11 +69,13 @@ static void fill_background(const struct pixel_argb_u16 *background_color,
> >>  }
> >>  
> >>  /**
> >> - * @wb_frame_info: The writeback frame buffer metadata
> >> + * blend
> > As we are already here:
> > * blend - blend pixels from a given row and calculate crc
> 
>  * blend: blend pixels from a given row and calculate CRC
> 
> preferably.

Hmm.. I didn't get the colon suggestion. This first line is a brief
description of the function blend(), so I understand that a more
accurate doc standard is:

blend() - Blend pixels from a given row and calculate crc

Thanks,

Melissa

> 
> > Reviewed-by: Melissa Wen <mwen@...lia.com>
> > 
> >> + * @wb: The writeback frame buffer metadata
> >>   * @crtc_state: The crtc state
> >>   * @crc32: The crc output of the final frame
> >>   * @output_buffer: A buffer of a row that will receive the result of the blend(s)
> >>   * @stage_buffer: The line with the pixels from plane being blend to the output
> >> + * @row_size: Size of memory taken up by row data (line_width * pixel_size)
> >>   *
> >>   * This function blends the pixels (Using the `pre_mul_alpha_blend`)
> >>   * from all planes, calculates the crc32 of the output from the former step,
> >> -- 
> >> 2.40.0.rc1.284.g88254d51c5-goog
> >>
> 
> -- 
> ~Randy


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