linux-kernel - Re: [PATCH v5 4/8] drm/omap: omap_plane: subclass drm_plane

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Message-ID: <9814d390-6bfd-5b95-4ea0-412e255ef840@baylibre.com>
Date:   Tue, 12 Oct 2021 10:56:45 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     linux-omap@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, khilman@...libre.com,
        Benoit Parrot <bparrot@...com>
Subject: Re: [PATCH v5 4/8] drm/omap: omap_plane: subclass drm_plane_state

On 12/10/2021 10:13, Tomi Valkeinen wrote:
> On 23/09/2021 10:06, Neil Armstrong wrote:
>> From: Benoit Parrot <bparrot@...com>
>>
>> In preparation to add omap plane state specific extensions we need to
>> subclass drm_plane_state and add the relevant helpers.
>>
>> The addition of specific extension will be done separately.
>>
>> Signed-off-by: Benoit Parrot <bparrot@...com>
>> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
>> ---
>>   drivers/gpu/drm/omapdrm/omap_plane.c | 38 +++++++++++++++++++++++++---
>>   1 file changed, 35 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
>> index 0df5381cc015..bda794b4c915 100644
>> --- a/drivers/gpu/drm/omapdrm/omap_plane.c
>> +++ b/drivers/gpu/drm/omapdrm/omap_plane.c
>> @@ -16,6 +16,13 @@
>>    * plane funcs
>>    */
>>   +#define to_omap_plane_state(x) container_of(x, struct omap_plane_state, base)
>> +
>> +struct omap_plane_state {
>> +    /* Must be first. */
>> +    struct drm_plane_state base;
>> +};
>> +
>>   #define to_omap_plane(x) container_of(x, struct omap_plane, base)
>>     struct omap_plane {
>> @@ -207,11 +214,17 @@ void omap_plane_install_properties(struct drm_plane *plane,
>>   static void omap_plane_reset(struct drm_plane *plane)
>>   {
>>       struct omap_plane *omap_plane = to_omap_plane(plane);
>> +    struct omap_plane_state *omap_state;
>>   -    drm_atomic_helper_plane_reset(plane);
>> -    if (!plane->state)
>> +    if (plane->state)
>> +        drm_atomic_helper_plane_destroy_state(plane, plane->state);
>> +
>> +    omap_state = kzalloc(sizeof(*omap_state), GFP_KERNEL);
>> +    if (!omap_state)
>>           return;
>>   +    __drm_atomic_helper_plane_reset(plane, &omap_state->base);
>> +
>>       /*
>>        * Set the zpos default depending on whether we are a primary or overlay
>>        * plane.
>> @@ -222,6 +235,25 @@ static void omap_plane_reset(struct drm_plane *plane)
>>       plane->state->color_range = DRM_COLOR_YCBCR_FULL_RANGE;
>>   }
>>   +static struct drm_plane_state *
>> +omap_plane_atomic_duplicate_state(struct drm_plane *plane)
>> +{
>> +    struct omap_plane_state *state;
>> +    struct omap_plane_state *copy;
>> +
>> +    if (WARN_ON(!plane->state))
>> +        return NULL;
>> +
>> +    state = to_omap_plane_state(plane->state);
>> +    copy = kmemdup(state, sizeof(*state), GFP_KERNEL);
>> +    if (!copy)
>> +        return NULL;
>> +
>> +    __drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
>> +
>> +    return &copy->base;
>> +}
>> +
> 
> omap_crtc.c has similar, but slightly different, functions. I think it would be good to use the same style in omap_plane, or, if the approach above is better, change omap_crtc to match the style here.

Indeed the crtc version is better, I used the same style.

Thanks,
Neil

> 
>  Tomi