linux-kernel - Re: [PATCH 6/6 v2] MMC: JZ4740: Add support for LPM.

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Date:   Fri, 18 Oct 2019 17:37:47 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Zhou Yanjie <zhouyanjie@...o.com>, linux-mips@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mmc@...r.kernel.org, DTML <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paul Burton <paul.burton@...s.com>,
        Mark Rutland <mark.rutland@....com>, syq@...ian.org,
        Linus Walleij <linus.walleij@...aro.org>, armijn@...ldur.nl,
        Thomas Gleixner <tglx@...utronix.de>,
        YueHaibing <yuehaibing@...wei.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: Re: [PATCH 6/6 v2] MMC: JZ4740: Add support for LPM.

Hi Uffe,


Le ven., oct. 18, 2019 at 10:52, Ulf Hansson <ulf.hansson@...aro.org> a 
écrit :
> On Sat, 12 Oct 2019 at 07:19, Zhou Yanjie <zhouyanjie@...o.com> wrote:
>> 
>>  add support for low power mode of Ingenic's MMC/SD Controller.
>> 
>>  Signed-off-by: Zhou Yanjie <zhouyanjie@...o.com>
> 
> I couldn't find a proper coverletter for the series, please provide
> that next time as it really helps review. Additionally, it seems like
> you forgot to change the prefix of the patches to "mmc: jz4740" (or at
> least you chosed upper case letters), but I will take care of that
> this time. So, I have applied the series for next, thanks!
> 
> I also have a general question. Should we perhaps rename the driver
> from jz4740_mmc.c to ingenic.c (and the file for the DT bindings, the
> Kconfig, etc), as that seems like a more appropriate name? No?

Is there a kernel policy regarding renaming drivers? Since it trashes 
the git history. Anyway you're the subsystem maintainer so I guess 
that's up to you. I can send a patch to rename it if you want.

Cheers,
-Paul


> 
> Kind regards
> Uffe
> 
> 
>>  ---
>>   drivers/mmc/host/jz4740_mmc.c | 23 +++++++++++++++++++++++
>>   1 file changed, 23 insertions(+)
>> 
>>  diff --git a/drivers/mmc/host/jz4740_mmc.c 
>> b/drivers/mmc/host/jz4740_mmc.c
>>  index 44a04fe..4cbe7fb 100644
>>  --- a/drivers/mmc/host/jz4740_mmc.c
>>  +++ b/drivers/mmc/host/jz4740_mmc.c
>>  @@ -43,6 +43,7 @@
>>   #define JZ_REG_MMC_RESP_FIFO   0x34
>>   #define JZ_REG_MMC_RXFIFO      0x38
>>   #define JZ_REG_MMC_TXFIFO      0x3C
>>  +#define JZ_REG_MMC_LPM         0x40
>>   #define JZ_REG_MMC_DMAC                0x44
>> 
>>   #define JZ_MMC_STRPCL_EXIT_MULTIPLE BIT(7)
>>  @@ -102,6 +103,12 @@
>>   #define JZ_MMC_DMAC_DMA_SEL BIT(1)
>>   #define JZ_MMC_DMAC_DMA_EN BIT(0)
>> 
>>  +#define        JZ_MMC_LPM_DRV_RISING BIT(31)
>>  +#define        JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY BIT(31)
>>  +#define        JZ_MMC_LPM_DRV_RISING_1NS_DLY BIT(30)
>>  +#define        JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY BIT(29)
>>  +#define        JZ_MMC_LPM_LOW_POWER_MODE_EN BIT(0)
>>  +
>>   #define JZ_MMC_CLK_RATE 24000000
>> 
>>   enum jz4740_mmc_version {
>>  @@ -860,6 +867,22 @@ static int jz4740_mmc_set_clock_rate(struct 
>> jz4740_mmc_host *host, int rate)
>>          }
>> 
>>          writew(div, host->base + JZ_REG_MMC_CLKRT);
>>  +
>>  +       if (real_rate > 25000000) {
>>  +               if (host->version >= JZ_MMC_X1000) {
>>  +                       writel(JZ_MMC_LPM_DRV_RISING_QTR_PHASE_DLY |
>>  +                                  
>> JZ_MMC_LPM_SMP_RISING_QTR_OR_HALF_PHASE_DLY |
>>  +                                  JZ_MMC_LPM_LOW_POWER_MODE_EN,
>>  +                                  host->base + JZ_REG_MMC_LPM);
>>  +               } else if (host->version >= JZ_MMC_JZ4760) {
>>  +                       writel(JZ_MMC_LPM_DRV_RISING |
>>  +                                  JZ_MMC_LPM_LOW_POWER_MODE_EN,
>>  +                                  host->base + JZ_REG_MMC_LPM);
>>  +               } else if (host->version >= JZ_MMC_JZ4725B)
>>  +                       writel(JZ_MMC_LPM_LOW_POWER_MODE_EN,
>>  +                                  host->base + JZ_REG_MMC_LPM);
>>  +       }
>>  +
>>          return real_rate;
>>   }
>> 
>>  --
>>  2.7.4
>> 
>>