linux-kernel - Re: [PATCH v2 2/2] ASoC: codec: lpass-rx-macro: add suppor for 2.5 codec version

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Date: Wed, 12 Jun 2024 18:09:41 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: broonie@...nel.org, perex@...ex.cz, lgirdwood@...il.com,
 alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, krzk+dt@...nel.org,
 neil.armstrong@...aro.org, krzysztof.kozlowski@...aro.org
Subject: Re: [PATCH v2 2/2] ASoC: codec: lpass-rx-macro: add suppor for 2.5
 codec version



On 12/06/2024 17:52, Dmitry Baryshkov wrote:
> On Wed, Jun 12, 2024 at 03:37:56PM +0100, Srinivas Kandagatla wrote:
>>
>>
>> On 07/06/2024 12:03, Dmitry Baryshkov wrote:
>>> On Thu, Jun 06, 2024 at 01:25:59PM +0100, srinivas.kandagatla@...aro.org wrote:
>>>> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>>>>
>>>> LPASS Codec v2.5 has significant changes in the rx register offsets.
>>>> Due to this headset playback on SM8550, SM8650, x1e80100 and all SoCs
>>>> after SM8450 have only Left working.
>>>>
>>>> This patch adjusts the registers to accomdate 2.5 changes. With this
>>>> fixed now L and R are functional on Headset playback.
>>>>
>>>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>>>> ---
>>>>    sound/soc/codecs/lpass-rx-macro.c | 565 ++++++++++++++++++++++--------
>>>>    1 file changed, 410 insertions(+), 155 deletions(-)
>>>>
>>>> diff --git a/sound/soc/codecs/lpass-rx-macro.c b/sound/soc/codecs/lpass-rx-macro.c
>>>> index f35187d69cac..bb8ede0e7076 100644
>>>> --- a/sound/soc/codecs/lpass-rx-macro.c
>>>> +++ b/sound/soc/codecs/lpass-rx-macro.c
>>>>    static int rx_macro_probe(struct platform_device *pdev)
>>>>    {
>>>> +	struct reg_default *reg_defaults;
>>>>    	struct device *dev = &pdev->dev;
>>>>    	kernel_ulong_t flags;
>>>>    	struct rx_macro *rx;
>>>>    	void __iomem *base;
>>>> -	int ret;
>>>> +	int ret, def_count;
>>>>    	flags = (kernel_ulong_t)device_get_match_data(dev);
>>>> @@ -3567,6 +3793,33 @@ static int rx_macro_probe(struct platform_device *pdev)
>>>>    		goto err;
>>>>    	}
>>>> +	rx->codec_version = lpass_macro_get_codec_version();
>>>
>>> What guarantees that VA macro has been probed already? If I'm not
>>> mistaken, we might easily get a default '0' here instead of a correct
>>> version.
>>
>> fsgen(Frame sync gen) clk is derived from VA macro, so if we are here that
>> means the va macro is probed.
> 
> Is this written in stone or is it just a current way how these codecs
> are connected?

LPASS Codec IP which encompasses 5 other codec macros blocks (wsa, wsa2, 
tx, rx, va) all the codec macros receive framesync from VA codec block, 
this is the hw design.

Not sure what do you mean by written in stone, but this is LPASS Codec 
design, at-least to the codec versions that this driver supports.

> 
>>>> +	switch (rx->codec_version) {
>>>> +	case LPASS_CODEC_VERSION_2_5 ... LPASS_CODEC_VERSION_2_8:
>>>> +		rx->rxn_reg_offset = 0xc0;
>>>> +		def_count = ARRAY_SIZE(rx_defaults) + ARRAY_SIZE(rx_2_5_defaults);
>>>> +		reg_defaults = kmalloc_array(def_count, sizeof(struct reg_default), GFP_KERNEL);
>>>> +		if (!reg_defaults)
>>>> +			return -ENOMEM;
>>>> +		memcpy(&reg_defaults[0], rx_defaults, sizeof(rx_defaults));
>>>> +		memcpy(&reg_defaults[ARRAY_SIZE(rx_defaults)],
>>>> +				rx_2_5_defaults, sizeof(rx_2_5_defaults));
>>>> +		break;
>>>> +	default:
>>>> +		rx->rxn_reg_offset = 0x80;
>>>> +		def_count = ARRAY_SIZE(rx_defaults) + ARRAY_SIZE(rx_pre_2_5_defaults);
>>>> +		reg_defaults = kmalloc_array(def_count, sizeof(struct reg_default), GFP_KERNEL);
>>>> +		if (!reg_defaults)
>>>> +			return -ENOMEM;
>>>> +		memcpy(&reg_defaults[0], rx_defaults, sizeof(rx_defaults));
>>>> +		memcpy(&reg_defaults[ARRAY_SIZE(rx_defaults)],
>>>> +				rx_pre_2_5_defaults, sizeof(rx_pre_2_5_defaults));
>>>> +		break;
>>>> +	}
>>>> +
>>>> +	rx_regmap_config.reg_defaults = reg_defaults,
>>>> +	rx_regmap_config.num_reg_defaults = def_count;
>>>> +
>>>>    	rx->regmap = devm_regmap_init_mmio(dev, base, &rx_regmap_config);
>>>>    	if (IS_ERR(rx->regmap)) {
>>>>    		ret = PTR_ERR(rx->regmap);
>>>> @@ -3629,6 +3882,7 @@ static int rx_macro_probe(struct platform_device *pdev)
>>>>    	if (ret)
>>>>    		goto err_clkout;
>>>> +	kfree(reg_defaults);
>>>>    	return 0;
>>>>    err_clkout:
>>>> @@ -3642,6 +3896,7 @@ static int rx_macro_probe(struct platform_device *pdev)
>>>>    err_dcodec:
>>>>    	clk_disable_unprepare(rx->macro);
>>>>    err:
>>>> +	kfree(reg_defaults);
>>>>    	lpass_macro_pds_exit(rx->pds);
>>>>    	return ret;
>>>> -- 
>>>> 2.21.0
>>>>
>>>
>