> -----Original Message----- > From: Chris Ball [mailto:c...@laptop.org] > Sent: Friday, January 06, 2012 11:00 PM > To: Huang Changming-R66093 > Cc: linux-mmc@vger.kernel.org; Huang Changming-R66093; Jain Priyanka- > B32167 > Subject: Re: [PATCH 5/5 v4] ESDHC: Fix DMA errors in kernel booting on > P1010 > > Hi Jerry, > > On Fri, Jan 06 2012, r66...@freescale.com wrote: > > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index > > 2db0d5c..d5a2259 100644 > > --- a/drivers/mmc/host/sdhci.c > > +++ b/drivers/mmc/host/sdhci.c > > @@ -832,14 +832,29 @@ static void sdhci_prepare_data(struct sdhci_host > *host, struct mmc_command *cmd) > > * is ADMA. > > */ > > if (host->version >= SDHCI_SPEC_200) { > > - ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); > > - ctrl &= ~SDHCI_CTRL_DMA_MASK; > > - if ((host->flags & SDHCI_REQ_USE_DMA) && > > - (host->flags & SDHCI_USE_ADMA)) > > - ctrl |= SDHCI_CTRL_ADMA32; > > - else > > - ctrl |= SDHCI_CTRL_SDMA; > > - sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); > > + if (host->quirks2 & SDHCI_QUIRK2_QORIQ_PROCTL_WEIRD) { > > +#define ESDHCI_PROCTL_DMAS_MASK 0x00000300 > > +#define ESDHCI_PROCTL_ADMA32 0x00000200 > > +#define ESDHCI_PROCTL_SDMA 0x00000000 > > + u32 ctrl; > > + ctrl = sdhci_readl(host, SDHCI_HOST_CONTROL); > > + ctrl &= ~ESDHCI_PROCTL_DMAS_MASK; > > + if ((host->flags & SDHCI_REQ_USE_DMA) && > > + (host->flags & SDHCI_USE_ADMA)) > > + ctrl |= ESDHCI_PROCTL_ADMA32; > > + else > > + ctrl |= ESDHCI_PROCTL_SDMA; > > + sdhci_writel(host, ctrl, SDHCI_HOST_CONTROL); > > + } else { > > + ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL); > > + ctrl &= ~SDHCI_CTRL_DMA_MASK; > > + if ((host->flags & SDHCI_REQ_USE_DMA) && > > + (host->flags & SDHCI_USE_ADMA)) > > + ctrl |= SDHCI_CTRL_ADMA32; > > + else > > + ctrl |= SDHCI_CTRL_SDMA; > > + sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL); > > + } > > drivers/mmc/host/sdhci.c must know nothing about ESDHC registers. > It's a generic driver. We can add hooks so that your own driver can run > code in the right place instead. > Hi, Chris, For the PROCTL register, the FSL ESDHC controller has different bit setting. So I just redefined the related bit for this register. I have thought about it, but I didn't find the better way to implement it. If use the hook, but, how to handle the bit setting for SDHCI_POWER_CONTROL?
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