linux-kernel - Re: [PATCH v4 05/12] mmc: mediatek: add pad

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Date:   Wed, 11 Oct 2017 09:26:57 +0800
From:   Chaotian Jing <chaotian.jing@...iatek.com>
To:     Julien Thierry <julien.thierry@....com>
CC:     Ulf Hansson <ulf.hansson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <srv_heupstream@...iatek.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Will Deacon <will.deacon@....com>,
        <linux-kernel@...r.kernel.org>, yong mao <yong.mao@...iatek.com>,
        Phong LE <ple@...libre.com>, Rob Herring <robh+dt@...nel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-mmc@...r.kernel.org>, Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH v4 05/12] mmc: mediatek: add pad_tune0 support

On Tue, 2017-10-10 at 17:57 +0100, Julien Thierry wrote:
> Hi,
> 
> On 10/10/17 10:30, Chaotian Jing wrote:
> > from mt2701, the register of PAD_TUNE has been phased out,
> > while there is a new register of PAD_TUNE0
> > 
> > Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> > ---
> >   drivers/mmc/host/mtk-sd.c | 69 ++++++++++++++++++++++++++++++++++-------------
> >   1 file changed, 51 insertions(+), 18 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index ab2fbbb..0dc45b3 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -75,6 +75,7 @@
> >   #define MSDC_PATCH_BIT   0xb0
> >   #define MSDC_PATCH_BIT1  0xb4
> >   #define MSDC_PAD_TUNE    0xec
> > +#define MSDC_PAD_TUNE0   0xf0
> >   #define PAD_DS_TUNE      0x188
> >   #define PAD_CMD_TUNE     0x18c
> >   #define EMMC50_CFG0      0x208
> > @@ -301,6 +302,7 @@ struct msdc_save_para {
> >   struct mtk_mmc_compatible {
> >   	u8 clk_div_bits;
> >   	bool hs400_tune; /* only used for MT8173 */
> > +	bool pad_tune0;
> 
> You only use this to decide whether to use MDSC_PAD_TUNE or 
> MSDC_PAD_TUNE0 as tune regs.
> 
> Couldn't this field directly be a 'u32' that is either MDSC_PAD_TUNE or 
> MDSC_PAD_TUNE0 rather than a bool?
> 
Thx, will change to "u32 pad_tune_reg;" at next version.
> >   };
> >   
> >   struct msdc_tune_para {
> > @@ -362,21 +364,25 @@ struct msdc_host {
> >   static const struct mtk_mmc_compatible mt8135_compat = {
> >   	.clk_div_bits = 8,
> >   	.hs400_tune = false,
> > +	.pad_tune0 = false,
> 
> and here we could have (field could be renamed accordingly of course):
> 
> 	.pad_tune0 = MDSC_PAD_TUNE,
> 
> >   };
> >   
> >   static const struct mtk_mmc_compatible mt8173_compat = {
> >   	.clk_div_bits = 8,
> >   	.hs400_tune = true,
> > +	.pad_tune0 = false,
> >   };
> >   
> >   static const struct mtk_mmc_compatible mt2701_compat = {
> >   	.clk_div_bits = 12,
> >   	.hs400_tune = false,
> > +	.pad_tune0 = true,
> 
> here:
> 	.pad_tune0 = MDSC_PAD_TUNE0,
> 
> >   };
> >   
> >   static const struct mtk_mmc_compatible mt2712_compat = {
> >   	.clk_div_bits = 12,
> >   	.hs400_tune = false,
> > +	.pad_tune0 = true,
> >   };
> >   
> >   static const struct of_device_id msdc_of_ids[] = {
> > @@ -581,6 +587,10 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
> >   	u32 flags;
> >   	u32 div;
> >   	u32 sclk;
> > +	u32 tune_reg = MSDC_PAD_TUNE;
> > +
> > +	if (host->dev_comp->pad_tune0)
> > +		tune_reg = MSDC_PAD_TUNE0;
> 
> And this would not be needed here nor in the other functions, it could 
> just be replaced by host->dev_comp->pad_tune0.
> 
> Thanks,
>