linux-kernel - Re: [PATCH RFC v2 19/20] drm/vkms: Introduce support for post-blend color pipeline

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Message-ID: <4c393a1a-3ded-490c-a6f8-c120dfcf1188@collabora.com>
Date: Wed, 10 Dec 2025 18:15:20 -0300
From: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
To: Louis Chauvet <louis.chauvet@...tlin.com>,
 Nícolas F. R. A. Prado <nfraprado@...labora.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Haneen Mohammed <hamohammed.sa@...il.com>,
 Melissa Wen <melissa.srw@...il.com>
Cc: Alex Hung <alex.hung@....com>, wayland-devel@...ts.freedesktop.org,
 harry.wentland@....com, leo.liu@....com, ville.syrjala@...ux.intel.com,
 pekka.paalanen@...labora.com, contact@...rsion.fr, mwen@...lia.com,
 jadahl@...hat.com, sebastian.wick@...hat.com, shashank.sharma@....com,
 agoins@...dia.com, joshua@...ggi.es, mdaenzer@...hat.com, aleixpol@....org,
 xaver.hugl@...il.com, victoria@...tem76.com, uma.shankar@...el.com,
 quic_naseer@...cinc.com, quic_cbraga@...cinc.com, quic_abhinavk@...cinc.com,
 marcan@...can.st, Liviu.Dudau@....com, sashamcintosh@...gle.com,
 chaitanya.kumar.borah@...el.com, mcanal@...lia.com, kernel@...labora.com,
 daniels@...labora.com, leandro.ribeiro@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 Simona Vetter <simona.vetter@...ll.ch>
Subject: Re: [PATCH RFC v2 19/20] drm/vkms: Introduce support for post-blend
 color pipeline

Louis,

On 9/19/25 9:50 AM, Louis Chauvet wrote:
> 
> 
> Le 18/09/2025 à 02:43, Nícolas F. R. A. Prado a écrit :
>> Introduce a post-blend color pipeline with the same colorop blocks as
>> the pre-blend color pipeline.
>>
>> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
>> ---
>>   drivers/gpu/drm/vkms/vkms_colorop.c  | 98 ++++++++++++++++++++++++++ 
>> ++++++++++
>>   drivers/gpu/drm/vkms/vkms_composer.c |  5 +-
>>   drivers/gpu/drm/vkms/vkms_crtc.c     |  1 +
>>   drivers/gpu/drm/vkms/vkms_drv.h      |  1 +
>>   4 files changed, 104 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/vkms/vkms_colorop.c b/drivers/gpu/drm/ 
>> vkms/vkms_colorop.c
>> index 
>> 5924ae2bd40fc904048f99bc9b96308140709e25..54c512db68eef16435d5f79453784f7784d540fb 100644
>> --- a/drivers/gpu/drm/vkms/vkms_colorop.c
>> +++ b/drivers/gpu/drm/vkms/vkms_colorop.c
>> @@ -98,6 +98,86 @@ vkms_initialize_pre_blend_color_pipeline(struct 
>> drm_plane *plane,
>>       return ret;
>>   }
>> +static int
>> +vkms_initialize_post_blend_color_pipeline(struct drm_crtc *crtc,
>> +                      struct drm_prop_enum_list *list)
>> +{
>> +    struct drm_colorop *ops[MAX_COLOR_PIPELINE_OPS];
>> +    struct drm_device *dev = crtc->dev;
>> +    int ret;
>> +    int i = 0;
>> +
>> +    memset(ops, 0, sizeof(ops));
>> +
>> +    /* 1st op: 1d curve */
>> +    ops[i] = kzalloc(sizeof(*ops[i]), GFP_KERNEL);
>> +    if (!ops[i]) {
>> +        ret = -ENOMEM;
>> +        goto cleanup;
>> +    }
>> +
>> +    ret = drm_crtc_colorop_curve_1d_init(dev, ops[i], crtc, 
>> supported_tfs,
>> +                         DRM_COLOROP_FLAG_ALLOW_BYPASS);
>> +    if (ret)
>> +        goto cleanup;
>> +
>> +    list->type = ops[i]->base.id;
>> +    list->name = kasprintf(GFP_KERNEL, "Color Pipeline %d", ops[i]- 
>> >base.id);
>> +
>> +    i++;
>> +
>> +    /* 2nd op: 3x4 matrix */
>> +    ops[i] = kzalloc(sizeof(*ops[i]), GFP_KERNEL);
>> +    if (!ops[i]) {
>> +        ret = -ENOMEM;
>> +        goto cleanup;
>> +    }
>> +
>> +    ret = drm_crtc_colorop_ctm_3x4_init(dev, ops[i], crtc, 
>> DRM_COLOROP_FLAG_ALLOW_BYPASS);
>> +    if (ret)
>> +        goto cleanup;
>> +
>> +    drm_colorop_set_next_property(ops[i - 1], ops[i]);
>> +
>> +    i++;
>> +
>> +    /* 3rd op: 3x4 matrix */
>> +    ops[i] = kzalloc(sizeof(*ops[i]), GFP_KERNEL);
>> +    if (!ops[i]) {
>> +        ret = -ENOMEM;
>> +        goto cleanup;
>> +    }
>> +
>> +    ret = drm_crtc_colorop_ctm_3x4_init(dev, ops[i], crtc, 
>> DRM_COLOROP_FLAG_ALLOW_BYPASS);
>> +    if (ret)
>> +        goto cleanup;
>> +
>> +    drm_colorop_set_next_property(ops[i - 1], ops[i]);
>> +
>> +    i++;
>> +
>> +    /* 4th op: 1d curve */
>> +    ops[i] = kzalloc(sizeof(*ops[i]), GFP_KERNEL);
>> +    if (!ops[i]) {
>> +        ret = -ENOMEM;
>> +        goto cleanup;
>> +    }
>> +
>> +    ret = drm_crtc_colorop_curve_1d_init(dev, ops[i], crtc, 
>> supported_tfs,
>> +                         DRM_COLOROP_FLAG_ALLOW_BYPASS);
>> +    if (ret)
>> +        goto cleanup;
>> +
>> +    drm_colorop_set_next_property(ops[i - 1], ops[i]);
>> +
>> +    return 0;
>> +
>> +cleanup:
>> +    drm_colorop_pipeline_destroy(dev);
> 
> Same comment as for pre_blend colorops, it feel strange to destroy all 
> the pipelines here.
> 
> The suggestion in [1] is better (don't forget to add the kfree).
> 
> [1]: https://lore.kernel.org/all/73f01810-df2d-4e39-a20b- 
> fc1cec2c5e12@....com/
Ack, will be addressed in v3.

Regards,

-- 
Ariel D'Alessandro
Software Engineer

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