linux-kernel - Re: [PATCH v6 4/8] drm/bridge: mhdp8546: Set input_bus_flags from atomic

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Message-ID: <1eb4b838-4f9c-6e95-925a-69487060ec55@ti.com>
Date:   Tue, 23 May 2023 11:27:19 +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 4/8] drm/bridge: mhdp8546: Set input_bus_flags from
 atomic_check

Hi Neil,

On 22-May-23 13:35, neil.armstrong@...aro.org wrote:
> On 17/05/2023 07:48, Aradhya Bhatia wrote:
>> Hi Neil,
>>
>> On 16-May-23 12:54, 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.
>>>>
>>>> Signed-off-by: Nikhil Devshatwar <nikhil.nd@...com>
>>>> [a-bhatia1: replace timings in cdns_mhdp_platform_info by
>>>> input_bus_flags]
>>>> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
>>>> ---
>>>>
>>>> Notes:
>>>>
>>>>       changes from v5:
>>>>       * removed the wrongly addded return statement in tfp410 driver.
>>>>       * replaced the timings field in cdns_mhdp_platform_info by
>>>>         input_bus_flags field, in order to get rid of bridge->timings
>>>>         altogether.
>>>>
>>>>    drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c  | 11
>>>> ++++++++---
>>>>    drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h  |  2 +-
>>>>    drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c |  9 ++++-----
>>>>    drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h |  2 +-
>>>>    4 files changed, 14 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>>>> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>>>> index 623e4235c94f..a677b1267525 100644
>>>> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>>>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>>>> @@ -2189,6 +2189,13 @@ static int cdns_mhdp_atomic_check(struct
>>>> drm_bridge *bridge,
>>>>            return -EINVAL;
>>>>        }
>>>>    +    /*
>>>> +     * There might be flags negotiation supported in future.
>>>> +     * Set the bus flags in atomic_check statically for now.
>>>> +     */
>>>> +    if (mhdp->info)
>>>> +        bridge_state->input_bus_cfg.flags =
>>>> *mhdp->info->input_bus_flags;
>>>> +
>>>>        mutex_unlock(&mhdp->link_mutex);
>>>>        return 0;
>>>>    }
>>>> @@ -2554,8 +2561,6 @@ static int cdns_mhdp_probe(struct
>>>> platform_device *pdev)
>>>>        mhdp->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
>>>>                   DRM_BRIDGE_OP_HPD;
>>>>        mhdp->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
>>>> -    if (mhdp->info)
>>>> -        mhdp->bridge.timings = mhdp->info->timings;
>>>
>>> Won't this cause a breakage because at this point in time
>>> bridge.timings->input_bus_flags
>>> seems to be still used by tidss right ?
>>>
>>
>> tidss was using the bridge.timings->input_bus_flags before the 7th
>> patch[1] in this series.
>>
>> After the patch, it only relies on bridge_state and display_info for bus
>> flags and formats.
> 
> OK thanks, then:
> 
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> 
> if you resend a new version, please add this info in the commit message.

Thank you! Will do so.

Regards
Aradhya

> 
> Neil
> 
>>
>>
>> Regards
>> Aradhya
>>
>> [1]: https://lore.kernel.org/all/20230509093036.3303-8-a-bhatia1@ti.com/
>>
>>
>>>
>>>>          ret = phy_init(mhdp->phy);
>>>>        if (ret) {
>>>> @@ -2642,7 +2647,7 @@ static const struct of_device_id mhdp_ids[] = {
>>>>    #ifdef CONFIG_DRM_CDNS_MHDP8546_J721E
>>>>        { .compatible = "ti,j721e-mhdp8546",
>>>>          .data = &(const struct cdns_mhdp_platform_info) {
>>>> -          .timings = &mhdp_ti_j721e_bridge_timings,
>>>> +          .input_bus_flags = &mhdp_ti_j721e_bridge_input_bus_flags,
>>>>              .ops = &mhdp_ti_j721e_ops,
>>>>          },
>>>>        },
>>>> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
>>>> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
>>>> index bedddd510d17..bad2fc0c7306 100644
>>>> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
>>>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.h
>>>> @@ -336,7 +336,7 @@ struct cdns_mhdp_bridge_state {
>>>>    };
>>>>      struct cdns_mhdp_platform_info {
>>>> -    const struct drm_bridge_timings *timings;
>>>> +    const u32 *input_bus_flags;
>>>>        const struct mhdp_platform_ops *ops;
>>>>    };
>>>>    diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
>>>> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
>>>> index dfe1b59514f7..12d04be4e242 100644
>>>> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
>>>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.c
>>>> @@ -71,8 +71,7 @@ const struct mhdp_platform_ops mhdp_ti_j721e_ops = {
>>>>        .disable = cdns_mhdp_j721e_disable,
>>>>    };
>>>>    -const struct drm_bridge_timings mhdp_ti_j721e_bridge_timings = {
>>>> -    .input_bus_flags = DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE |
>>>> -               DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE |
>>>> -               DRM_BUS_FLAG_DE_HIGH,
>>>> -};
>>>> +const u32
>>>> +mhdp_ti_j721e_bridge_input_bus_flags =
>>>> DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE |
>>>> +                       DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE |
>>>> +                       DRM_BUS_FLAG_DE_HIGH;
>>>> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
>>>> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
>>>> index 97d20d115a24..5ddca07a4255 100644
>>>> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
>>>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-j721e.h
>>>> @@ -14,6 +14,6 @@
>>>>    struct mhdp_platform_ops;
>>>>      extern const struct mhdp_platform_ops mhdp_ti_j721e_ops;
>>>> -extern const struct drm_bridge_timings mhdp_ti_j721e_bridge_timings;
>>>> +extern const u32 mhdp_ti_j721e_bridge_input_bus_flags;
>>>>      #endif /* !CDNS_MHDP8546_J721E_H */
>>>
>