linux-kernel - Re: [PATCH 2/2] sdhci-of-arasan: Set controller to test mode when fails-without-test-cd is present

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <13c1a30f-fb4f-a813-df0a-3ac9914cfa61@xilinx.com>
Date:   Tue, 30 Aug 2016 07:47:17 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Zach Brown <zach.brown@...com>, <adrian.hunter@...el.com>
CC:     <robh+dt@...nel.org>, <ulf.hansson@...aro.org>,
        <mark.rutland@....com>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <michal.simek@...inx.com>, <soren.brinkmann@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] sdhci-of-arasan: Set controller to test mode when
 fails-without-test-cd is present

On 30.8.2016 01:20, Zach Brown wrote:
> The sdhci controller on xilinx zynq devices will not function unless
> the CD bit is provided. http://www.xilinx.com/support/answers/61064.html
> In cases where it is impossible to provide the CD bit in hardware,
> setting the controller to test mode and then setting inserted to true
> will get the controller to function without the CD bit.
> 
> When the device has the property fails-without-test-cd the driver
> changes the controller to test mode and sets test inserted to true to
> make the controller function.
> 
> Signed-off-by: Zach Brown <zach.brown@...com>
> ---
>  drivers/mmc/host/sdhci-of-arasan.c | 34 +++++++++++++++++++++++++++++++++-
>  drivers/mmc/host/sdhci.h           |  2 ++
>  2 files changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index e0f193f..c3e5145 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -26,6 +26,7 @@
>  #include <linux/phy/phy.h>
>  #include <linux/regmap.h>
>  #include "sdhci-pltfm.h"
> +#include <linux/of.h>
> 
>  #define SDHCI_ARASAN_CLK_CTRL_OFFSET	0x2c
>  #define SDHCI_ARASAN_VENDOR_REGISTER	0x78
> @@ -92,6 +93,12 @@ struct sdhci_arasan_data {
> 
>  	struct regmap	*soc_ctl_base;
>  	const struct sdhci_arasan_soc_ctl_map *soc_ctl_map;
> +
> +	unsigned int arasan_quirks; /* Arasan deviations from spec */
> +
> +/* Controller does not have CD wired and will not function normally without */
> +#define SDHCI_ARASAN_QUIRK_FAILS_WITHOUT_TEST_CD (1<<0)

Bit macro instead?

> +

remove this line.

>  };
> 
>  static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = {
> @@ -203,12 +210,32 @@ static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
>  	writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
>  }
> 
> +void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
> +{
> +	u8 ctrl;
> +	struct sdhci_pltfm_host *pltfm_host;
> +	struct sdhci_arasan_data *sdhci_arasan;
> +
> +	sdhci_reset(host, mask);
> +
> +	pltfm_host = sdhci_priv(host);
> +	sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
> +
> +	if (sdhci_arasan->arasan_quirks &
> +	    SDHCI_ARASAN_QUIRK_FAILS_WITHOUT_TEST_CD) {
> +		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> +		ctrl |= SDHCI_CTRL_CDTEST_INS |
> +			SDHCI_CTRL_CDTEST_EN;
> +		sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
> +	}
> +}
> +
>  static struct sdhci_ops sdhci_arasan_ops = {
>  	.set_clock = sdhci_arasan_set_clock,
>  	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
>  	.get_timeout_clock = sdhci_arasan_get_timeout_clock,
>  	.set_bus_width = sdhci_set_bus_width,
> -	.reset = sdhci_reset,
> +	.reset = sdhci_arasan_reset,
>  	.set_uhs_signaling = sdhci_set_uhs_signaling,
>  };
> 
> @@ -516,6 +543,11 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
>  	}
> 
>  	sdhci_get_of_property(pdev);
> +
> +	if (of_get_property(pdev->dev.of_node, "fails-without-test-cd", NULL))
> +		sdhci_arasan->arasan_quirks |=
> +				SDHCI_ARASAN_QUIRK_FAILS_WITHOUT_TEST_CD;
> +
>  	pltfm_host->clk = clk_xin;
> 
>  	sdhci_arasan_update_baseclkfreq(host);
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 0411c9f..8d92d6e9 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -84,6 +84,8 @@
>  #define   SDHCI_CTRL_ADMA32	0x10
>  #define   SDHCI_CTRL_ADMA64	0x18
>  #define   SDHCI_CTRL_8BITBUS	0x20
> +#define  SDHCI_CTRL_CDTEST_INS   0x40
> +#define  SDHCI_CTRL_CDTEST_EN     0x80

You should follow coding style above.

Thanks,
Michal