linux-kernel - Re: [PATCH 4.19 033/106] drm/amd/display: support spdif

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Date:   Tue, 8 Oct 2019 15:32:41 +0000
From:   "Lakha, Bhawanpreet" <Bhawanpreet.Lakha@....com>
To:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "Liu, Charlene" <Charlene.Liu@....com>,
        "Laktyushkin, Dmytro" <Dmytro.Laktyushkin@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        Sasha Levin <sashal@...nel.org>,
        "Wentland, Harry" <Harry.Wentland@....com>
Subject: Re: [PATCH 4.19 033/106] drm/amd/display: support spdif

+Harry

You're completely right. This was part of a larger patch dealing with 
embargoed code and is meaningless without the embargoed code. It 
should've been caught and never gone upstream. We've already put some 
new processes in place to deal with patches like this going forward.

This isn't a good candidate for stable trees but shouldn't really hurt 
anything if it's already in.

On 2019-10-08 9:37 a.m., Pavel Machek wrote:
> Hi!
>
>> [ Upstream commit b5a41620bb88efb9fb31a4fa5e652e3d5bead7d4 ]
>>
>> [Description]
>> port spdif fix to staging:
>>   spdif hardwired to afmt inst 1.
>>   spdif func pointer
>>   spdif resource allocation (reserve last audio endpoint for spdif only)
> I'm sorry, but I don't understand this changelog. Code below modifies
> whitespace, adds a debug output, and uses local variable for
> pool->audio_count.
>
> Does not seem to be a bugfix, and does not seem to do anything with
> staging.
>
> Best regards,
> 								Pavel
>
>
>> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_resource.c
>> @@ -229,12 +229,10 @@ bool resource_construct(
>>   				DC_ERR("DC: failed to create audio!\n");
>>   				return false;
>>   			}
>> -
>>   			if (!aud->funcs->endpoint_valid(aud)) {
>>   				aud->funcs->destroy(&aud);
>>   				break;
>>   			}
>> -
>>   			pool->audios[i] = aud;
>>   			pool->audio_count++;
>>   		}
>> @@ -1703,24 +1701,25 @@ static struct audio *find_first_free_audio(
>>   		const struct resource_pool *pool,
>>   		enum engine_id id)
>>   {
>> -	int i;
>> -	for (i = 0; i < pool->audio_count; i++) {
>> +	int i, available_audio_count;
>> +
>> +	available_audio_count = pool->audio_count;
>> +
>> +	for (i = 0; i < available_audio_count; i++) {
>>   		if ((res_ctx->is_audio_acquired[i] == false) && (res_ctx->is_stream_enc_acquired[i] == true)) {
>>   			/*we have enough audio endpoint, find the matching inst*/
>>   			if (id != i)
>>   				continue;
>> -
>>   			return pool->audios[i];
>>   		}
>>   	}
>>   
>> -    /* use engine id to find free audio */
>> -	if ((id < pool->audio_count) && (res_ctx->is_audio_acquired[id] == false)) {
>> +	/* use engine id to find free audio */
>> +	if ((id < available_audio_count) && (res_ctx->is_audio_acquired[id] == false)) {
>>   		return pool->audios[id];
>>   	}
>> -
>>   	/*not found the matching one, first come first serve*/
>> -	for (i = 0; i < pool->audio_count; i++) {
>> +	for (i = 0; i < available_audio_count; i++) {
>>   		if (res_ctx->is_audio_acquired[i] == false) {
>>   			return pool->audios[i];
>>   		}
>> diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c b/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
>> index 7f6d724686f1a..abb559ce64085 100644
>> --- a/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
>> +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_audio.c
>> @@ -611,6 +611,8 @@ void dce_aud_az_configure(
>>   
>>   	AZ_REG_WRITE(AZALIA_F0_CODEC_PIN_CONTROL_SINK_INFO1,
>>   		value);
>> +	DC_LOG_HW_AUDIO("\n\tAUDIO:az_configure: index: %u data, 0x%x, displayName %s: \n",
>> +		audio->inst, value, audio_info->display_name);
>>   
>>   	/*
>>   	*write the port ID:
>> @@ -922,7 +924,6 @@ static const struct audio_funcs funcs = {
>>   	.az_configure = dce_aud_az_configure,
>>   	.destroy = dce_aud_destroy,
>>   };
>> -
>>   void dce_aud_destroy(struct audio **audio)
>>   {
>>   	struct dce_audio *aud = DCE_AUD(*audio);
>> @@ -953,7 +954,6 @@ struct audio *dce_audio_create(
>>   	audio->regs = reg;
>>   	audio->shifts = shifts;
>>   	audio->masks = masks;
>> -
>>   	return &audio->base;
>>   }
>>