linux-kernel - Re: [PATCH v3 1/5] mmc: sdhci-pxav3: enable proper resuming on Armada 38x SoC

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Date:	Thu, 22 Oct 2015 15:38:02 +0200
From:	Marcin Wojtas <mw@...ihalf.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Grzegorz Jaszczyk <jaz@...ihalf.com>,
	Jisheng Zhang <jszhang@...vell.com>
Subject: Re: [PATCH v3 1/5] mmc: sdhci-pxav3: enable proper resuming on Armada
 38x SoC

Hi Ulf

2015-10-22 15:29 GMT+02:00 Ulf Hansson <ulf.hansson@...aro.org>:
> On 15 October 2015 at 18:25, Marcin Wojtas <mw@...ihalf.com> wrote:
>> When resuming from suspend on Armada 38x SoC MBus windows have to be
>> re-configured and for that purpose mv_conf_mbus_windows function needed
>> rework. MBus windows register base address obtaining was moved to
>> armada_38x_quirks function in order to be kept in pxa global structure,
>> because it is used during a resume.
>>
>> This commit fixes resuming from suspend by calling MBus windows
>> configuration routine and therefore enabling proper DMA operation.
>>
>> Signed-off-by: Marcin Wojtas <mw@...ihalf.com>
>> ---
>>  drivers/mmc/host/sdhci-pxav3.c | 35 ++++++++++++++++-------------------
>>  1 file changed, 16 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
>> index f5edf9d..54a253c0 100644
>> --- a/drivers/mmc/host/sdhci-pxav3.c
>> +++ b/drivers/mmc/host/sdhci-pxav3.c
>> @@ -63,6 +63,7 @@ struct sdhci_pxa {
>>         struct clk *clk_io;
>>         u8      power_mode;
>>         void __iomem *sdio3_conf_reg;
>> +       void __iomem *mbus_win_regs;
>>  };
>>
>>  /*
>> @@ -81,30 +82,16 @@ struct sdhci_pxa {
>>  #define SDIO3_CONF_CLK_INV     BIT(0)
>>  #define SDIO3_CONF_SD_FB_CLK   BIT(2)
>>
>> -static int mv_conf_mbus_windows(struct platform_device *pdev,
>> +static int mv_conf_mbus_windows(struct device *dev, void __iomem *regs,
>>                                 const struct mbus_dram_target_info *dram)
>>  {
>>         int i;
>> -       void __iomem *regs;
>> -       struct resource *res;
>>
>>         if (!dram) {
>> -               dev_err(&pdev->dev, "no mbus dram info\n");
>> -               return -EINVAL;
>> -       }
>> -
>> -       res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> -       if (!res) {
>> -               dev_err(&pdev->dev, "cannot get mbus registers\n");
>> +               dev_err(dev, "no mbus dram info\n");
>>                 return -EINVAL;
>>         }
>>
>> -       regs = ioremap(res->start, resource_size(res));
>> -       if (!regs) {
>> -               dev_err(&pdev->dev, "cannot map mbus registers\n");
>> -               return -ENOMEM;
>> -       }
>> -
>>         for (i = 0; i < SDHCI_MAX_WIN_NUM; i++) {
>>                 writel(0, regs + SDHCI_WINDOW_CTRL(i));
>>                 writel(0, regs + SDHCI_WINDOW_BASE(i));
>> @@ -122,8 +109,6 @@ static int mv_conf_mbus_windows(struct platform_device *pdev,
>>                 writel(cs->base, regs + SDHCI_WINDOW_BASE(i));
>>         }
>>
>> -       iounmap(regs);
>> -
>>         return 0;
>>  }
>>
>> @@ -135,6 +120,11 @@ static int armada_38x_quirks(struct platform_device *pdev,
>>         struct sdhci_pxa *pxa = pltfm_host->priv;
>>         struct resource *res;
>>
>> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mbus");
>
> You change from using platform_get_resource(pdev, IORESOURCE_MEM, 1)
> to above name based lookup.
>
> I guess it's intentional, but there's no information about it in the
> change-log, perhaps add it?
>

Sure, good point.

Best regards,
Marcin
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