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SubjectRe: [PATCH v2 6/8] drm: Introduce drm_bridge_mode_valid()
On Tue, May 09, 2017 at 06:00:13PM +0100, Jose Abreu wrote:
> Introduce a new helper function which calls mode_valid() callback
> for all bridges in an encoder chain.
>
> Signed-off-by: Jose Abreu <joabreu@synopsys.com>
> Cc: Carlos Palminha <palminha@synopsys.com>
> Cc: Alexey Brodkin <abrodkin@synopsys.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Dave Airlie <airlied@linux.ie>
> Cc: Andrzej Hajda <a.hajda@samsung.com>
> Cc: Archit Taneja <architt@codeaurora.org>
> ---
> drivers/gpu/drm/drm_bridge.c | 33 +++++++++++++++++++++++++++++++++
> include/drm/drm_bridge.h | 2 ++
> 2 files changed, 35 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index 86a7637..dc8cdfe 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -206,6 +206,39 @@ bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
> EXPORT_SYMBOL(drm_bridge_mode_fixup);
>
> /**
> + * drm_bridge_mode_valid - validate the mode against all bridges in the
> + * encoder chain.
> + * @bridge: bridge control structure
> + * @mode: desired mode to be validated
> + *
> + * Calls &drm_bridge_funcs.mode_valid for all the bridges in the encoder
> + * chain, starting from the first bridge to the last. If at least one bridge
> + * does not accept the mode the function returns the error code.
> + *
> + * Note: the bridge passed should be the one closest to the encoder.
> + *
> + * RETURNS:
> + * MODE_OK on success, drm_mode_status Enum error code on failure
> + */
> +enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode)
> +{
> + enum drm_mode_status ret = MODE_OK;
> +
> + if (!bridge)
> + return ret;
> +
> + if (bridge->funcs->mode_valid)
> + ret = bridge->funcs->mode_valid(bridge, mode);
> +
> + if (ret != MODE_OK)
> + return ret;
> +
> + return drm_bridge_mode_valid(bridge->next, mode);

Looks like it should be pretty trivial to avoid the recursion.

Am I correct in interpreting this that bridges have some kind of
a hand rolled linked list implementation? Reusing the standard
linked lists would allow you to use list_for_each() etc.

> +}
> +EXPORT_SYMBOL(drm_bridge_mode_valid);
> +
> +/**
> * drm_bridge_disable - disables all bridges in the encoder chain
> * @bridge: bridge control structure
> *
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 00c6c36..8358eb3 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -233,6 +233,8 @@ int drm_bridge_attach(struct drm_encoder *encoder, struct drm_bridge *bridge,
> bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
> const struct drm_display_mode *mode,
> struct drm_display_mode *adjusted_mode);
> +enum drm_mode_status drm_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode);
> void drm_bridge_disable(struct drm_bridge *bridge);
> void drm_bridge_post_disable(struct drm_bridge *bridge);
> void drm_bridge_mode_set(struct drm_bridge *bridge,
> --
> 1.9.1
>

--
Ville Syrjälä
Intel OTC

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