Subject: Re: [PATCH v2 13/14] spi: bcmbca-hsspi: Add driver for newer HSSPI
 controller
To:     Jonas Gorski <jonas.gorski@gmail.com>
Cc:     Linux SPI List <linux-spi@vger.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@broadcom.com>,
        tomer.yacoby@broadcom.com, kursad.oney@broadcom.com,
        dregan@mail.com, f.fainelli@gmail.com, anand.gore@broadcom.com,
        dan.beygelman@broadcom.com, joel.peshkin@broadcom.com,
        kernel test robot <lkp@intel.com>,
        Mark Brown <broonie@kernel.org>,
        =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20230124221218.341511-1-william.zhang@broadcom.com>
 <20230124221218.341511-14-william.zhang@broadcom.com>
 <CAOiHx=mgEGe5_sn++QcPkX14+DzTw7cthabsyJaJZYQVsjLhsw@mail.gmail.com>
From:   William Zhang <william.zhang@broadcom.com>
Message-ID: <2f4c0e38-af4a-8b01-8327-b6d6b666780c@broadcom.com>
Date:   Thu, 26 Jan 2023 18:17:58 -0800
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On 01/26/2023 07:16 AM, Jonas Gorski wrote:
>> +static void bcmbca_hsspi_set_cs(struct bcmbca_hsspi *bs, unsigned int cs,
>> +                                bool active)
>> +{
>> +       u32 reg;
>> +
>> +       /* No cs orerriden needed for SS7 internal cs on pcm based voice dev */
>> +       if (cs == 7)
>> +               return;
>> +
>> +       mutex_lock(&bs->bus_mutex);
>> +
>> +       if (active) {
>> +               /* activate cs by setting the override bit and active value bit*/
>> +               reg = __raw_readl(bs->spim_ctrl);
>> +               reg |= BIT(cs+SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
> 
> Doesn't checkpatch complain about missing spaces around the operator (+)?
> 
Nope...

>> +               reg &= ~BIT(cs+SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
>> +               if (bs->cs_polarity & BIT(cs))
>> +                       reg |= BIT(cs+SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
> 
> Does the CS_OVERRIDE_VAL get reset on clearing the OVERRIDE_SEL bit or
> it is persistent? If the latter, you could initialize its value in
> bcmbca_hsspi_setup() and then this becomes:
> 
> reg = _raw_readl(bs->spim_ctrl);
> if (active)
>     reg |= BIT(cs+SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
> else
>     reg &= ~BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
>   __raw_writel(reg, bs->spim_ctrl);
> 
> and you can drop the cs_polarity field.
> 
> 
No. So I will try this optimization and see if that actually works in 
the controller.

>> +               __raw_writel(reg, bs->spim_ctrl);
>> +       } else {
>> +               /* clear the cs override bit */
>> +               reg = __raw_readl(bs->spim_ctrl);
>> +               reg &= ~BIT(cs+SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
>> +               __raw_writel(reg, bs->spim_ctrl);
>> +       }
>> +
>> +       mutex_unlock(&bs->bus_mutex);
>> +}
>> +

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