linux-kernel - Re: [PATCH] drm: bridge: cdns-mhdp8546: Add mode_valid hook for the drm_bridge

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Message-ID: <5e7c1f01-70ad-4383-a785-91b0405f3b7d@ti.com>
Date: Mon, 27 May 2024 12:55:10 +0530
From: Jayesh Choudhary <j-choudhary@...com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <andrzej.hajda@...el.com>,
        <neil.armstrong@...aro.org>, <rfoss@...nel.org>,
        <Laurent.pinchart@...asonboard.com>, <mripard@...nel.org>,
        <dri-devel@...ts.freedesktop.org>, <jonas@...boo.se>,
        <jernej.skrabec@...il.com>, <maarten.lankhorst@...ux.intel.com>,
        <tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
        <u.kleine-koenig@...gutronix.de>, <a-bhatia1@...com>,
        <javierm@...hat.com>, <nikhil.nd@...com>, <jani.nikula@...el.com>,
        <amishin@...rgos.ru>
Subject: Re: [PATCH] drm: bridge: cdns-mhdp8546: Add mode_valid hook for the
 drm_bridge_funcs



On 24/05/24 15:13, Dmitry Baryshkov wrote:
> On Fri, May 24, 2024 at 12:43:48PM +0530, Jayesh Choudhary wrote:
>> With the support for the 'DRM_BRIDGE_ATTACH_NO_CONNECTOR' case,
>> the connector_helper funcs are not initialized if the encoder has this
>> flag in its bridge_attach call. Till now we had mode_valid hook only in
>> the drm_connector_helper_funcs. Add this hook in drm_bridge_funcs to
>> validate the modes in this case as well.
>>
>> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
>> ---
>>   .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 31 +++++++++++++++----
>>   1 file changed, 25 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>> index 8a91ef0ae065..0aee038f5db7 100644
>> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
>> @@ -1617,12 +1617,10 @@ bool cdns_mhdp_bandwidth_ok(struct cdns_mhdp_device *mhdp,
>>   	return true;
>>   }
>>   
>> -static
>> -enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn,
>> -					  struct drm_display_mode *mode)
>> +static enum
>> +drm_mode_status cdns_mhdp_mode_valid(struct cdns_mhdp_device *mhdp,
>> +				     const struct drm_display_mode *mode)
>>   {
>> -	struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
>> -
>>   	mutex_lock(&mhdp->link_mutex);
>>   
>>   	if (!cdns_mhdp_bandwidth_ok(mhdp, mode, mhdp->link.num_lanes,
>> @@ -1635,6 +1633,16 @@ enum drm_mode_status cdns_mhdp_mode_valid(struct drm_connector *conn,
>>   	return MODE_OK;
>>   }
>>   
>> +static enum drm_mode_status
>> +cdns_mhdp_connector_mode_valid(struct drm_connector *conn,
>> +			       struct drm_display_mode *mode)
>> +{
>> +	struct cdns_mhdp_device *mhdp = connector_to_mhdp(conn);
>> +	const struct drm_display_mode *mod = mode;
>> +
>> +	return cdns_mhdp_mode_valid(mhdp, mod);
>> +}
>> +
>>   static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn,
>>   					    struct drm_atomic_state *state)
>>   {
>> @@ -1678,7 +1686,7 @@ static int cdns_mhdp_connector_atomic_check(struct drm_connector *conn,
>>   static const struct drm_connector_helper_funcs cdns_mhdp_conn_helper_funcs = {
>>   	.detect_ctx = cdns_mhdp_connector_detect,
>>   	.get_modes = cdns_mhdp_get_modes,
>> -	.mode_valid = cdns_mhdp_mode_valid,
>> +	.mode_valid = cdns_mhdp_connector_mode_valid,
> 
> Just move it to bridge_funcs and drop it from connector_helper_funcs. It
> should be enough.

Okay.
Will change in v2.

Thanks,
Jayesh

> 
>>   	.atomic_check = cdns_mhdp_connector_atomic_check,
>>   };
>>   
>> @@ -2233,6 +2241,16 @@ static const struct drm_edid *cdns_mhdp_bridge_edid_read(struct drm_bridge *brid
>>   	return cdns_mhdp_edid_read(mhdp, connector);
>>   }
>>   
>> +static enum drm_mode_status
>> +cdns_mhdp_bridge_mode_valid(struct drm_bridge *bridge,
>> +			    const struct drm_display_info *info,
>> +			    const struct drm_display_mode *mode)
>> +{
>> +	struct cdns_mhdp_device *mhdp = bridge_to_mhdp(bridge);
>> +
>> +	return cdns_mhdp_mode_valid(mhdp, mode);
>> +}
>> +
>>   static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
>>   	.atomic_enable = cdns_mhdp_atomic_enable,
>>   	.atomic_disable = cdns_mhdp_atomic_disable,
>> @@ -2247,6 +2265,7 @@ static const struct drm_bridge_funcs cdns_mhdp_bridge_funcs = {
>>   	.edid_read = cdns_mhdp_bridge_edid_read,
>>   	.hpd_enable = cdns_mhdp_bridge_hpd_enable,
>>   	.hpd_disable = cdns_mhdp_bridge_hpd_disable,
>> +	.mode_valid = cdns_mhdp_bridge_mode_valid,
>>   };
>>   
>>   static bool cdns_mhdp_detect_hpd(struct cdns_mhdp_device *mhdp, bool *hpd_pulse)
>> -- 
>> 2.25.1
>>
>