On 6.9.2016 20:51, Zach Brown wrote: > On Tue, Aug 30, 2016 at 07:47:17AM +0200, Michal Simek wrote: >> 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@xxxxxx> >>> --- >>> 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? >> > > Setting bits with notations like (1<<0) is the style which is used for quirks > in sdhci.h Is there a reason it should be different here? sdhci.h is here for a long time and IIRC using BIT macro is recommended way. >>> + >> >> 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. > > I don't understand the issue you're raising. Could you elaborate? Origin format is #define<space><space>MACRO_NAME<tab>MACRO_VALUE What you have above is not following this style. You should turn on tab highlighting in your editor. Thanks, Michal -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
