Re: [PATCH v7 12/13] drm/exynos: atomic dpms support

[Inki Dae <inki.dae@samsung.com>]

Hi Gustavo,

On 2015년 05월 23일 00:40, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> 
> Run dpms operations through the atomic intefaces. This basically removes
> the .dpms() callback from econders and crtcs and use .disable() and
> .enable() to turn the crtc on and off.
> 
> v2: Address comments by Joonyoung:
> 	- make hdmi code call ->disable() instead of ->dpms()
> 	- do not use WARN_ON on crtc enable/disable
> 
> v3: - Fix build failure after the hdmi change in v2
>     - Change dpms helper of ptn3460 bridge
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> Reviewed-by: Joonyoung Shim <jy0922.shim@samsung.com>
> Tested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
> ---
>  drivers/gpu/drm/bridge/ps8622.c             |  2 +-
>  drivers/gpu/drm/bridge/ptn3460.c            |  2 +-
>  drivers/gpu/drm/exynos/exynos_dp_core.c     |  2 +-
>  drivers/gpu/drm/exynos/exynos_drm_crtc.c    | 95 ++++++++++++++++-------------
>  drivers/gpu/drm/exynos/exynos_drm_dpi.c     |  2 +-
>  drivers/gpu/drm/exynos/exynos_drm_drv.h     |  4 +-
>  drivers/gpu/drm/exynos/exynos_drm_dsi.c     |  2 +-
>  drivers/gpu/drm/exynos/exynos_drm_encoder.c | 27 ++------
>  drivers/gpu/drm/exynos/exynos_drm_vidi.c    |  2 +-
>  drivers/gpu/drm/exynos/exynos_hdmi.c        |  6 +-
>  10 files changed, 69 insertions(+), 75 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/ps8622.c b/drivers/gpu/drm/bridge/ps8622.c
> index b604326..d686235 100644
> --- a/drivers/gpu/drm/bridge/ps8622.c
> +++ b/drivers/gpu/drm/bridge/ps8622.c
> @@ -499,7 +499,7 @@ static void ps8622_connector_destroy(struct drm_connector *connector)
>  }
>  
>  static const struct drm_connector_funcs ps8622_connector_funcs = {
> -	.dpms = drm_helper_connector_dpms,
> +	.dpms = drm_atomic_helper_connector_dpms,
>  	.fill_modes = drm_helper_probe_single_connector_modes,
>  	.detect = ps8622_detect,
>  	.destroy = ps8622_connector_destroy,
> diff --git a/drivers/gpu/drm/bridge/ptn3460.c b/drivers/gpu/drm/bridge/ptn3460.c
> index 8ed3617..260bc9f 100644
> --- a/drivers/gpu/drm/bridge/ptn3460.c
> +++ b/drivers/gpu/drm/bridge/ptn3460.c
> @@ -260,7 +260,7 @@ static void ptn3460_connector_destroy(struct drm_connector *connector)
>  }
>  
>  static struct drm_connector_funcs ptn3460_connector_funcs = {
> -	.dpms = drm_helper_connector_dpms,
> +	.dpms = drm_atomic_helper_connector_dpms,
>  	.fill_modes = drm_helper_probe_single_connector_modes,
>  	.detect = ptn3460_detect,
>  	.destroy = ptn3460_connector_destroy,
> diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
> index 195fe60..c9995b1 100644
> --- a/drivers/gpu/drm/exynos/exynos_dp_core.c
> +++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
> @@ -954,7 +954,7 @@ static void exynos_dp_connector_destroy(struct drm_connector *connector)
>  }
>  

[--snip--]

>  
>  static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
> -	.dpms		= exynos_drm_crtc_dpms,
> -	.prepare	= exynos_drm_crtc_prepare,
> -	.commit		= exynos_drm_crtc_commit,
> +	.enable		= exynos_drm_crtc_enable,
> +	.disable	= exynos_drm_crtc_disable,
>  	.mode_fixup	= exynos_drm_crtc_mode_fixup,
>  	.mode_set	= drm_helper_crtc_mode_set,
>  	.mode_set_nofb	= exynos_drm_crtc_mode_set_nofb,

I think it'd be better to use atomic_flush callback to enable global dma
like commit callback did. Is there any reason that you don't use
atomic_begin and atomic_flush callbacks?

atomic relevant codes I looked into do as follows,

atomic_begin();

atomic_update();  /* this will call win_commit callback to set a overlay
relevant registers and enable its dma channel. */

atomic_flush();

So atomic overlay updating between atomic_begin() ~ atomic_flush() will
be guaranteed.

Thanks,
Inki Dae

>  	.mode_set_base	= drm_helper_crtc_mode_set_base,
> -	.disable	= exynos_drm_crtc_disable,
> +	.atomic_check	= exynos_crtc_atomic_check,
>  };
>  

[--snip--]