On Mon, Nov 8, 2010 at 8:48 PM, zhangfei gao <zhangfei.gao@xxxxxxxxx> wrote: > On Mon, Nov 8, 2010 at 4:17 AM, Wolfram Sang <w.sang@xxxxxxxxxxxxxx> wrote: >>> > This isn't a quirk, this is platform_data, no? >>> >>> Never sure of the difference between a quirk and platform data. >>> example: Broken card detect is a quirk but maybe some slots on the board work and some do not >> >> A quirk is something which needs to be handled in a special case because >> some controllers do not adhere to the SDHC standard. An 8 bit bus seems >> to be in the 3.0 standard, so it is not a quirk :) Does the standard say >> anything about how the actual bus width should be handled? >> >> That said, you are right that quirks have been abused to cover board >> issues. Another reason to clean them up ;) >> >> Regards, >> >> Wolfram >> >> -- >> Pengutronix e.K. | Wolfram Sang | >> Industrial Linux Solutions | http://www.pengutronix.de/ | >> >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1.4.10 (GNU/Linux) >> >> iEYEARECAAYFAkzXwEIACgkQD27XaX1/VRuQ8QCeN1ueDODn5jbt9MS49MCJcQXS >> BccAn0VnBmmBbLRFvBf/wo4zStAXUGV0 >> =VwO1 >> -----END PGP SIGNATURE----- >> >> > > Highly concern of abuse of QUIRK, currently the highest bit is > (1<<29), while the quirks is u32. > Could we remove some quirk, such as SDHCI_QUIRK_FORCE_1_BIT_DATA, > which only used to transfer info to caps. > We could simply update mmc->caps after sdhci_add_host. Good, it's good starting pointing to remove SoC specific quriks. Now we try to find out that which quirks are needed for SDHCI. Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > > > arch/arm/plat-pxa/include/plat/sdhci.h | 2 ++ > drivers/mmc/host/sdhci-pxa.c | 5 +++++ > drivers/mmc/host/sdhci.c | 3 --- > include/linux/mmc/sdhci.h | 2 -- > 4 files changed, 7 insertions(+), 5 deletions(-) > > diff --git a/arch/arm/plat-pxa/include/plat/sdhci.h > b/arch/arm/plat-pxa/include/plat/sdhci.h > index e49c5b6..661dc48 100644 > --- a/arch/arm/plat-pxa/include/plat/sdhci.h > +++ b/arch/arm/plat-pxa/include/plat/sdhci.h > @@ -16,6 +16,8 @@ > /* pxa specific flag */ > /* Require clock free running */ > #define PXA_FLAG_DISABLE_CLOCK_GATING (1<<0) > +#define PXA_FLAG_FORCE_1_BIT_DATA (1<<2) > +#define PXA_FLAG_CAN_DO_8_BIT_DATA (1<<3) > > /* > * struct pxa_sdhci_platdata() - Platform device data for PXA SDHCI > diff --git a/drivers/mmc/host/sdhci-pxa.c b/drivers/mmc/host/sdhci-pxa.c > index fc406ac..3d63a37 100644 > --- a/drivers/mmc/host/sdhci-pxa.c > +++ b/drivers/mmc/host/sdhci-pxa.c > @@ -147,6 +147,11 @@ static int __devinit sdhci_pxa_probe(struct > platform_device *pdev) > goto out; > } > > + if (pxa->pdata->flags & PXA_FLAG_FORCE_1_BIT_DATA) > + host->mmc->caps &= ~(MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA); > + if (pxa->pdata->flags & PXA_FLAG_CAN_DO_8_BIT_DATA) > + host->mmc->caps |= MMC_CAP_8_BIT_DATA; > + > if (pxa->pdata->max_speed) > host->mmc->f_max = pxa->pdata->max_speed; > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c > index 154cbf8..2628ec2 100644 > --- a/drivers/mmc/host/sdhci.c > +++ b/drivers/mmc/host/sdhci.c > @@ -1858,9 +1858,6 @@ int sdhci_add_host(struct sdhci_host *host) > mmc->f_max = host->max_clk; > mmc->caps |= MMC_CAP_SDIO_IRQ; > > - if (!(host->quirks & SDHCI_QUIRK_FORCE_1_BIT_DATA)) > - mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA; > - > if (caps & SDHCI_CAN_DO_HISPD) > mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED; > > diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h > index 1fdc673..ede02a4 100644 > --- a/include/linux/mmc/sdhci.h > +++ b/include/linux/mmc/sdhci.h > @@ -67,8 +67,6 @@ struct sdhci_host { > #define SDHCI_QUIRK_FORCE_BLK_SZ_2048 (1<<20) > /* Controller cannot do multi-block transfers */ > #define SDHCI_QUIRK_NO_MULTIBLOCK (1<<21) > -/* Controller can only handle 1-bit data transfers */ > -#define SDHCI_QUIRK_FORCE_1_BIT_DATA (1<<22) > /* Controller needs 10ms delay between applying power and clock */ > #define SDHCI_QUIRK_DELAY_AFTER_POWER (1<<23) > /* Controller uses SDCLK instead of TMCLK for data timeouts */ > -- > 1.7.0.4 > -- > 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 > -- 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
