Re: [PATCH] drm/rockchip: get rid of rockchip_drm_crtc_mode_config

Mark yao
2016-04-20T02:20:07Z

On 2016年04月19日 17:06, John Keeping wrote:
> On Tue, 19 Apr 2016 10:43:03 +0800, Mark yao wrote:
>
>> On 2016年04月18日 17:25, John Keeping wrote:
>>> On Mon, 18 Apr 2016 11:03:31 +0800, Mark Yao wrote:
>>>
>>>>> We need to take care of the vop status when use
>>>>> rockchip_drm_crtc_mode_config, if vop is disabled,
>>>>> the function would failed, that is terrible.
>>>>>
>>>>> Save connector type and output mode on drm_display_mode->private_flags
>>>>> at encoder mode_fixup, then we can configure the type and mode safely
>>>>> on crtc mode_set.
>>> Since Rockchip is atomic, shouldn't this be using atomic_check hooks and
>>> a subclassed crtc_state structure?
>>>
>> I try to use atomic_check with crtc_state, but it seems not easy,
>> there are two value need transmit from connector to vop: connector type
>> and out_mode
>>
>> the connector type I think we can loop the atomic state to find the
>> connector type.
>> but the out_mode is a custom value, I can't find a generic way to
>> transmit it with atomic state.
>>
>> BTW, I think on atomic side, the drm_display_mode is under control by
>> atomic state,
>> and the mode->private_flags is not use by drm framework, I found i915
>> and gma500 also use
>> mode->private_flags to transmit custom value.
>>
>> So I think it's no problem using mode->private_flags.
> The documentation for drm_display_mode::private says:
>
> It shouldn't be used by atomic drivers since they can store any
> additional data by subclassing state structures.
>
> This applies to private_flags as well.
>
> I think this means that we should do something like the patch below
> (which isn't even compile tested and doesn't cover implementing
> drm_encoder_helper_funcs::atomic_check on all of the encoders):
>
> -- >8 --
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> index 00d17d71aa4c..9d65fa9188f4 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.h
> @@ -31,6 +31,14 @@
> struct drm_device;
> struct drm_connector;
>
> +struct rockchip_crtc_state {
> + struct drm_crtc_state base;
> + int output_type;
> + int output_mode;
> +};
> +
> +#define to_rockchip_crtc_state(s) container_of(x, struct rockchip_crtc_state, base)
> +
> /*
> * Rockchip drm private crtc funcs.
> * @enable_vblank: enable crtc vblank irq.
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index a619f120f801..5cdf3123e1eb 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -1044,13 +1044,34 @@ static void vop_crtc_destroy(struct drm_crtc *crtc)
> drm_crtc_cleanup(crtc);
> }
>
> +static struct drm_crtc_state *vop_crtc_duplicate_state(struct drm_crtc *crtc)
> +{
> + struct rockchip_crtc_state *rockchip_state;
> +
> + rockchip_state = kzalloc(sizeof(*rockchip_state), GFP_KERNEL);
> + if (!rockchip_state)
> + return NULL;
> +
> + __drm_atomic_helper_crtc_duplicate_state(crtc, &rockchip_state->base);
> + return &rockchip_state->base;
> +}
> +
> +static void vop_crtc_destroy_state(struct drm_crtc *crtc,
> + struct drm_crtc_state *state)
> +{
> + struct rockchip_crtc_state *s = to_rockchip_crtc_state(state);
> +
> + __drm_atomic_helper_crtc_destroy_state(crtc, &s->base);
> + kfree(s);
> +}
> +
> static const struct drm_crtc_funcs vop_crtc_funcs = {
> .set_config = drm_atomic_helper_set_config,
> .page_flip = drm_atomic_helper_page_flip,
> .destroy = vop_crtc_destroy,
> .reset = drm_atomic_helper_crtc_reset,
> - .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
> - .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> + .atomic_duplicate_state = vop_crtc_duplicate_state,
> + .atomic_destroy_state = vop_crtc_destroy_state,
> };
>
> static bool vop_win_pending_is_complete(struct vop_win *vop_win)
>
>
>
Hi John

Good, I had implement it according to your advise.

Thanks.