linux-kernel - Re: [linux-sunxi] [PATCH v3 02/12] ASoC: sun4i-i2s: Add clkdiv offsets to quirks

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Date:   Mon, 7 Aug 2017 08:20:27 +0200
From:   Code Kipper <codekipper@...il.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        "Andrea Venturi (pers)" <be17068@...rbole.bo.it>
Subject: Re: [linux-sunxi] [PATCH v3 02/12] ASoC: sun4i-i2s: Add clkdiv
 offsets to quirks

On 1 August 2017 at 04:55, Chen-Yu Tsai <wens@...e.org> wrote:
> On Sat, Jul 29, 2017 at 10:17 PM,  <codekipper@...il.com> wrote:
>> From: Marcus Cooper <codekipper@...il.com>
>>
>> The BCLKDIV and MCLKDIV found on newer SoCs start from an offset of 1.
>> Add the functionality to adjust the division values according to the
>> needs to the device being used.
>>
>> Signed-off-by: Marcus Cooper <codekipper@...il.com>
>> ---
>>  sound/soc/sunxi/sun4i-i2s.c | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
>> index d7ee7a443e4e..1d538de4e4d0 100644
>> --- a/sound/soc/sunxi/sun4i-i2s.c
>> +++ b/sound/soc/sunxi/sun4i-i2s.c
>> @@ -94,9 +94,13 @@
>>   * struct sun4i_i2s_quirks - Differences between SoC variants.
>>   *
>>   * @has_reset: SoC needs reset deasserted.
>> + * @mclk_offset: Value by which mclkdiv needs to be adjusted.
>> + * @bclk_offset: Value by which bclkdiv needs to be adjusted.
>>   */
>>  struct sun4i_i2s_quirks {
>>         bool                            has_reset;
>> +       unsigned int                    mclk_offset;
>> +       unsigned int                    bclk_offset;
>>  };
>>
>>  struct sun4i_i2s {
>> @@ -149,7 +153,7 @@ static int sun4i_i2s_get_bclk_div(struct sun4i_i2s *i2s,
>>                 const struct sun4i_i2s_clk_div *bdiv = &sun4i_i2s_bclk_div[i];
>>
>>                 if (bdiv->div == div)
>> -                       return bdiv->val;
>> +                       return bdiv->val + i2s->variant->bclk_offset;
>
> The offset should best be applied when the value is written to the register,
> in sun4i_i2s_set_clk_rate(). sun4i_i2s_get_*_div() should do what the name
> says, that is calculate a divider based on the parameters it is given.
>
ACK,
Thanks for the review,
CK
> Regards
> ChenYu
>
>>         }
>>
>>         return -EINVAL;
>> @@ -167,7 +171,7 @@ static int sun4i_i2s_get_mclk_div(struct sun4i_i2s *i2s,
>>                 const struct sun4i_i2s_clk_div *mdiv = &sun4i_i2s_mclk_div[i];
>>
>>                 if (mdiv->div == div)
>> -                       return mdiv->val;
>> +                       return mdiv->val + i2s->variant->mclk_offset;
>>         }
>>
>>         return -EINVAL;
>> --
>> 2.13.3
>>
>> --
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