linux-kernel - Re: regulator: mt6358 vdram2_idx/vsel_mask/ vsel

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Date:   Wed, 23 Jun 2021 13:02:47 +0800
From:   Hsin-hsiung Wang <hsin-hsiung.wang@...iatek.com>
To:     Axel Lin <axel.lin@...ics.com>
CC:     Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <fan.chen@...iatek.com>
Subject: Re: regulator: mt6358 vdram2_idx/vsel_mask/ vsel_shift setting
 seems wrong

Hi, Axel sir
After checking the spec, the vsel_mask is wrong.
I submit a patch to fix it.
Many thanks for the correcting. :)

On Tue, 2021-06-22 at 11:20 +0800, Axel Lin wrote:
> Hi Hsin-Hsiung,
> 
> In drivers/regulator/mt6358-regulator.c:
> 
> static const u32 vdram2_idx[] = {
>         0, 12,
> };
> 
> MT6358_LDO("ldo_vdram2", VDRAM2, vdram2_voltages, vdram2_idx,
>            MT6358_LDO_VDRAM2_CON0, 0, MT6358_LDO_VDRAM2_ELR0, 0x10, 0),
> 
> With current setting the vsel_mask does not match the vsel_shift setting
>    So in set_voltage_sel, it will call regmap_update_bits with
>    mask = 0x10
>    val = idx << 0
>    No matter idx is 0 (pvol[0]) or 12 (pvol[1]), it will clear vsel_mask bits
> 
> I don't have the datasheet to check, so please help to double check the
> vdram2_idx, vsel_mask and vsel_shift settings for ldo_vdram2.
> I think at least one of the settings is wrong.
> 
> Regards,
> Axel