linux-kernel - Re: [PATCH 4/8] mmc: sdhci-pxav3: enable proper resuming on Armada 38x SoC

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Date:	Tue, 06 Oct 2015 16:51:15 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Marcin Wojtas <mw@...ihalf.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mmc@...r.kernel.org, ulf.hansson@...aro.org,
	sebastian.hesselbarth@...il.com, andrew@...n.ch,
	jason@...edaemon.net, thomas.petazzoni@...e-electrons.com,
	nadavh@...vell.com, alior@...vell.com, tawfik@...vell.com,
	jaz@...ihalf.com
Subject: Re: [PATCH 4/8] mmc: sdhci-pxav3: enable proper resuming on Armada 38x SoC

Hi Marcin,
 
 On mar., oct. 06 2015, 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 | 39 ++++++++++++++++++++-------------------
>  1 file changed, 20 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
> index f5edf9d..3f71894 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;
>  };


>  
> @@ -135,6 +120,14 @@ 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");
> +	pxa->mbus_win_regs = devm_ioremap_resource(&pdev->dev, res);

[...]

> @@ -520,6 +514,13 @@ static int sdhci_pxav3_resume(struct device *dev)
>  {
>  	int ret;
>  	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_pxa *pxa = pltfm_host->priv;
> +	struct device_node *np = dev->of_node;
> +
> +	if (of_device_is_compatible(np, "marvell,armada-380-sdhci"))
> +		ret = mv_conf_mbus_windows(dev, pxa->mbus_win_regs,
> +					   mv_mbus_dram_info());

I would find it cleaner to not rely on the device tree outise the probe
function. What about just testing pxa->mbus_win_regs ? As it is set only
if we need it, it should be a good test.

Thanks,

Gregory


-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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