linux-kernel - Re: [PATCH v6 2/8] drm/bridge: tfp410: Set input_bus_flags in atomic

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Message-ID: <b2f4eed1-ba19-fc0e-3cf0-a0dfa2e0f2af@ti.com>
Date:   Tue, 16 May 2023 19:57:08 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     <neil.armstrong@...aro.org>, Tomi Valkeinen <tomba@...nel.org>,
        Jyri Sarha <jyri.sarha@....fi>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <rfoss@...nel.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rahul T R <r-ravikumar@...com>,
        Swapnil Jakhade <sjakhade@...ence.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Francesco Dolcini <francesco@...cini.it>
CC:     DRI Development List <dri-devel@...ts.freedesktop.org>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Jayesh Choudhary <j-choudhary@...com>
Subject: Re: [PATCH v6 2/8] drm/bridge: tfp410: Set input_bus_flags in
 atomic_check

Hi Neil,

On 16-May-23 12:55, Neil Armstrong wrote:
> On 09/05/2023 11:30, Aradhya Bhatia wrote:
>> From: Nikhil Devshatwar <nikhil.nd@...com>
>>
>> input_bus_flags are specified in drm_bridge_timings (legacy) as well
>> as drm_bridge_state->input_bus_cfg.flags
>>
>> The flags from the timings will be deprecated. Bridges are supposed
>> to validate and set the bridge state flags from atomic_check.
>>
>> Implement atomic_check hook for the same.
>>
>> Signed-off-by: Nikhil Devshatwar <nikhil.nd@...com>
>> ---
>>
>> Notes:
>>      changes from v4:
>>      * fix a warning Reported-by: kernel test robot <lkp@...el.com>
>>
>>      changes from v5:
>>      * Moved the return statement here from patch 4 (where it was added
>>        by mistake).
>>
>>   drivers/gpu/drm/bridge/ti-tfp410.c | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c
>> b/drivers/gpu/drm/bridge/ti-tfp410.c
>> index 7dacc7e03eee..631ae8f11a77 100644
>> --- a/drivers/gpu/drm/bridge/ti-tfp410.c
>> +++ b/drivers/gpu/drm/bridge/ti-tfp410.c
>> @@ -228,6 +228,21 @@ static u32 *tfp410_get_input_bus_fmts(struct
>> drm_bridge *bridge,
>>       return input_fmts;
>>   }
>>   +static int tfp410_atomic_check(struct drm_bridge *bridge,
>> +                   struct drm_bridge_state *bridge_state,
>> +                   struct drm_crtc_state *crtc_state,
>> +                   struct drm_connector_state *conn_state)
>> +{
>> +    struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
>> +
>> +    /*
>> +     * There might be flags negotiation supported in future.
>> +     * Set the bus flags in atomic_check statically for now.
>> +     */
>> +    bridge_state->input_bus_cfg.flags = dvi->timings.input_bus_flags;
> 
> A newline here before return would look better
Yup! Will add one.

> 
>> +    return 0;
>> +}
>> +
>>   static const struct drm_bridge_funcs tfp410_bridge_funcs = {
>>       .attach        = tfp410_attach,
>>       .detach        = tfp410_detach,
>> @@ -238,6 +253,7 @@ static const struct drm_bridge_funcs
>> tfp410_bridge_funcs = {
>>       .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
>>       .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>>       .atomic_get_input_bus_fmts = tfp410_get_input_bus_fmts,
>> +    .atomic_check = tfp410_atomic_check,
>>   };
>>     static const struct drm_bridge_timings tfp410_default_timings = {
> 
> With that fixed:
> 
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>

Thank you!


Regards
Aradhya