On 08/09/16 22:42, 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 xlnx-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@xxxxxx> > --- > drivers/mmc/host/sdhci-of-arasan.c | 27 ++++++++++++++++++++++++++- > drivers/mmc/host/sdhci.h | 2 ++ > 2 files changed, 28 insertions(+), 1 deletion(-) > > diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c > index 33601a8..37c8ca0 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 > @@ -98,6 +99,10 @@ struct sdhci_arasan_data { > > struct regmap *soc_ctl_base; > const struct sdhci_arasan_soc_ctl_map *soc_ctl_map; > + unsigned int quirks; /* Arasan deviations from spec */ > + > +/* Controller does not have CD wired and will not function normally without */ > +#define SDHCI_ARASAN_QUIRK_FORCE_CDTEST BIT(0) > }; > > static const struct sdhci_arasan_soc_ctl_map rk3399_soc_ctl_map = { > @@ -245,12 +250,27 @@ 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 = sdhci_priv(host); > + struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host); > + > + sdhci_reset(host, mask); > + > + if (sdhci_arasan->quirks & SDHCI_ARASAN_QUIRK_FORCE_CDTEST) { > + 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, > }; > > @@ -545,6 +565,7 @@ static int sdhci_arasan_probe(struct platform_device *pdev) > struct sdhci_host *host; > struct sdhci_pltfm_host *pltfm_host; > struct sdhci_arasan_data *sdhci_arasan; > + struct device_node *np = pdev->dev.of_node; > > host = sdhci_pltfm_init(pdev, &sdhci_arasan_pdata, > sizeof(*sdhci_arasan)); > @@ -599,6 +620,10 @@ static int sdhci_arasan_probe(struct platform_device *pdev) > } > > sdhci_get_of_property(pdev); > + > + if (of_get_property(np, "xlnx-fails-without-test-cd", NULL)) Sorry, should have spotted this before. This needs to be of_property_read_bool() not of_get_property(). > + sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST; > + > pltfm_host->clk = clk_xin; > > if (of_device_is_compatible(pdev->dev.of_node, > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h > index a2bc9e1..c722cd2 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 > > #define SDHCI_POWER_CONTROL 0x29 > #define SDHCI_POWER_ON 0x01 > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
