From: Archit Taneja <architt@codeaurora.org>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
dri-devel@lists.freedesktop.org
Cc: Jose Abreu <Jose.Abreu@synopsys.com>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Alexey Brodkin <Alexey.Brodkin@synopsys.com>,
linux-kernel@vger.kernel.org,
Carlos Palminha <CARLOS.PALMINHA@synopsys.com>
Subject: Re: [PATCH v2 6/8] drm: Introduce drm_bridge_mode_valid()
Date: Fri, 12 May 2017 16:20:07 +0530 [thread overview]
Message-ID: <ba918745-4e96-aca2-502c-532891d3615c@codeaurora.org> (raw)
In-Reply-To: <1645078.FS6fmucJTb@avalon>
On 05/12/2017 03:08 PM, Laurent Pinchart wrote:
> Hi Daniel,
>
> On Wednesday 10 May 2017 17:14:33 Daniel Vetter wrote:
>> On Wed, May 10, 2017 at 04:41:09PM +0300, Ville Syrjälä wrote:
>>> 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.
>>
>> Yeah it's a hand-rolled list, but current hw also has a bridge nesting
>> depth of 2, so it really doesn't matter. I guess once we have real long
>> chains of bridges we can fix this (and just using list_head sounds like a
>> great idea).
>
> Even if not really needed right now, it's a pretty easy cleanup, if Jose has
> time to handle it in v3 of this series let's not postpone it ;-)
jfyi, some of the bridge functions call the ops from the last bridge in the
chain to first, so we'd need to use list_for_each_entry_prev() (or something
like that) for them.
Archit
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2017-05-12 10:50 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-09 17:00 [PATCH v2 0/8] Introduce new mode validation callbacks Jose Abreu
2017-05-09 17:00 ` [PATCH v2 1/8] drm: Add crtc/encoder/bridge->mode_valid() callbacks Jose Abreu
2017-05-10 8:03 ` Daniel Vetter
2017-05-10 9:05 ` Jose Abreu
2017-05-12 8:24 ` Laurent Pinchart
2017-05-15 6:46 ` Daniel Vetter
2017-05-09 17:00 ` [PATCH v2 2/8] drm: Add drm_crtc_mode_valid() Jose Abreu
2017-05-10 7:59 ` Daniel Vetter
2017-05-10 8:57 ` Jose Abreu
2017-05-10 15:12 ` Daniel Vetter
2017-05-09 17:00 ` [PATCH v2 3/8] drm: Add drm_encoder_mode_valid() Jose Abreu
2017-05-09 17:00 ` [PATCH v2 4/8] drm: Add drm_connector_mode_valid() Jose Abreu
2017-05-09 17:00 ` [PATCH v2 5/8] drm: Use new mode_valid() helpers in connector probe helper Jose Abreu
2017-05-10 8:01 ` Daniel Vetter
2017-05-10 8:59 ` Jose Abreu
2017-05-12 9:35 ` Laurent Pinchart
2017-05-12 16:06 ` Jose Abreu
2017-05-14 11:04 ` Laurent Pinchart
2017-05-15 6:47 ` Daniel Vetter
2017-05-15 7:05 ` Laurent Pinchart
2017-05-16 5:11 ` Jose Abreu
2017-05-09 17:00 ` [PATCH v2 6/8] drm: Introduce drm_bridge_mode_valid() Jose Abreu
2017-05-10 13:41 ` Ville Syrjälä
2017-05-10 14:01 ` Jose Abreu
2017-05-10 14:07 ` Jose Abreu
2017-05-10 15:14 ` Daniel Vetter
2017-05-12 9:38 ` Laurent Pinchart
2017-05-12 10:50 ` Archit Taneja [this message]
2017-05-12 11:01 ` Laurent Pinchart
2017-05-15 4:18 ` Archit Taneja
2017-05-15 6:49 ` Daniel Vetter
2017-05-09 17:00 ` [PATCH v2 7/8] drm: Use mode_valid() in atomic modeset Jose Abreu
2017-05-10 16:08 ` Archit Taneja
2017-05-10 17:55 ` Daniel Vetter
2017-05-12 9:53 ` Laurent Pinchart
2017-05-15 6:50 ` Daniel Vetter
2017-05-09 17:00 ` [PATCH v2 8/8] drm: arc: Use crtc->mode_valid() callback Jose Abreu
2017-05-12 9:57 ` Laurent Pinchart
2017-05-15 1:40 ` Jose Abreu
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