linux-kernel - Re: [PATCH v2 1/3] soundwire: qcom: clear BIT FIELDs before value set.

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Message-ID: <24401c7c-b12c-0924-9d8f-fde633d15918@linux.intel.com>
Date:   Wed, 16 Sep 2020 08:18:26 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     yung-chuan.liao@...ux.intel.com, sanyog.r.kale@...el.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] soundwire: qcom: clear BIT FIELDs before value
 set.


>> According to usage (bitfields.h) of REG_FIELDS,
>> Modify is:
>>    reg &= ~REG_FIELD_C;
>>    reg |= FIELD_PREP(REG_FIELD_C, c);


if this is indeed the case, all the code in cadence_master.c is also 
broken, e.g:

	dpn_config = cdns_readl(cdns, dpn_config_off);

	dpn_config |= FIELD_PREP(CDNS_DPN_CONFIG_WL, (p_params->bps - 1));
	dpn_config |= FIELD_PREP(CDNS_DPN_CONFIG_PORT_FLOW, p_params->flow_mode);
	dpn_config |= FIELD_PREP(CDNS_DPN_CONFIG_PORT_DAT, p_params->data_mode);


Gah.