[PATCH 3/4 V2] mmc: esdhc: Correct host version of T4240-R1.0

[Zhang Haijun-B42677]

Thanks.

Regards
Haijun.


> -----Original Message-----
> From: Kumar Gala [mailto:galak at kernel.crashing.org]
> Sent: Monday, July 22, 2013 10:30 PM
> To: Zhang Haijun-B42677
> Cc: linux-mmc at vger.kernel.org; linuxppc-dev at lists.ozlabs.org; Wood Scott-
> B07421; cjb at laptop.org; Fleming Andy-AFLEMING; cbouatmailru at gmail.com
> Subject: Re: [PATCH 3/4 V2] mmc: esdhc: Correct host version of T4240-
> R1.0
> 
> 
> On Jul 17, 2013, at 5:11 AM, Haijun Zhang wrote:
> 
> > Vender version and sdhc spec version of T4240-R1.0 is incorrect.
> > The right value should be VVN=0x13, SVN = 0x1. The wrong version
> > number will break down the ADMA data transfer.
> > This defect only exist in T4240-R1.0. Will be fixed in T4240-R2.0.
> > Also share vvn and svr for public use.
> >
> > Signed-off-by: Haijun Zhang <haijun.zhang at freescale.com>
> > ---
> > changes for V2:
> > 	- Remove broken ADMA quirk.
> > 	- Rebuild patch of  Add quirks to support T4240 board
> >
> > drivers/mmc/host/sdhci-of-esdhc.c | 29 +++++++++++++----------------
> > 1 file changed, 13 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-of-esdhc.c
> > b/drivers/mmc/host/sdhci-of-esdhc.c
> > index adfaadd..570bca8 100644
> > --- a/drivers/mmc/host/sdhci-of-esdhc.c
> > +++ b/drivers/mmc/host/sdhci-of-esdhc.c
> > @@ -26,7 +26,7 @@
> > #define VENDOR_V_22	0x12
> > #define VENDOR_V_23	0x13
> >
> > -static u32 svr;
> > +static u32 svr, vvn;
> >
> > static u32 esdhc_readl(struct sdhci_host *host, int reg) { @@ -43,11
> > +43,9 @@ static u32 esdhc_readl(struct sdhci_host *host, int reg)
> > 	 * For FSL eSDHC, must aligned 4-byte, so use 0xFC to read the
> > 	 * the verdor version number, oxFE is SDHCI_HOST_VERSION.
> > 	 */
> > -	if ((reg == SDHCI_CAPABILITIES) && (ret & SDHCI_CAN_DO_ADMA1)) {
> > -		u32 tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
> > -		tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
> > -		if (tmp > VENDOR_V_22)
> > -			ret |= SDHCI_CAN_DO_ADMA2;
> > +	if ((reg == SDHCI_CAPABILITIES) && (ret & SDHCI_CAN_DO_ADMA1) &&
> > +		(vvn > VENDOR_V_22)) {
> > +		ret |= SDHCI_CAN_DO_ADMA2;
> > 	}
> >
> > 	return ret;
> > @@ -63,6 +61,12 @@ static u16 esdhc_readw(struct sdhci_host *host, int
> reg)
> > 		ret = in_be32(host->ioaddr + base) & 0xffff;
> > 	else
> > 		ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
> > +
> > +	/* T4240-R1.0 had a incorrect vendor version and spec version */
> > +	if ((reg == SDHCI_HOST_VERSION) &&
> > +		((SVR_SOC_VER(svr) == SVR_T4240) && (SVR_REV(svr) == 0x10)))
> > +		ret = (VENDOR_V_23 << SDHCI_VENDOR_VER_SHIFT) |
> SDHCI_SPEC_200;
> > +
> 
> is this check correct if this is on v2.0 Si as well?
[Haijun Wrote:] Oh, I forgot to rewrite the description above. This defect exist both
on T4-R1.0 and T4-R2.0. I'll send patch v3 to correct this. thanks
> 
> - k
> 
> > 	return ret;
> > }
> >
> > @@ -175,17 +179,12 @@ static void esdhc_reset(struct sdhci_host *host,
> > u8 mask)  */ static void esdhci_of_adma_workaround(struct sdhci_host
> > *host, u32 intmask) {
> > -	u32 tmp;
> > 	bool applicable;
> > 	dma_addr_t dmastart;
> > 	dma_addr_t dmanow;
> >
> > -	tmp = esdhc_readl(host, SDHCI_SLOT_INT_STATUS);
> > -	tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
> > -
> > 	applicable = (intmask & SDHCI_INT_DATA_END) &&
> > -		(intmask & SDHCI_INT_BLK_GAP) &&
> > -		(tmp == VENDOR_V_23);
> > +		(intmask & SDHCI_INT_BLK_GAP) && (vvn == VENDOR_V_23);
> > 	if (applicable) {
> >
> > 		esdhc_reset(host, SDHCI_RESET_DATA); @@ -318,10 +317,9 @@
> static
> > void esdhc_of_resume(struct sdhci_host *host)
> >
> > static void esdhc_of_platform_init(struct sdhci_host *host) {
> > -	u32 vvn;
> > +	svr = mfspr(SPRN_SVR);
> > +	vvn = esdhc_readw(host, SDHCI_HOST_VERSION);
> >
> > -	vvn = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
> > -	vvn = (vvn & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
> > 	if (vvn == VENDOR_V_22)
> > 		host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
> >
> > @@ -390,7 +388,6 @@ static int sdhci_esdhc_probe(struct platform_device
> *pdev)
> > 	struct device_node *np;
> > 	int ret;
> >
> > -	svr = mfspr(SPRN_SVR);
> > 	host = sdhci_pltfm_init(pdev, &sdhci_esdhc_pdata, 0);
> > 	if (IS_ERR(host))
> > 		return PTR_ERR(host);
> > --
> > 1.8.0
> >
> >
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