why imx6's usdhc hasn't the SDHCI_HOST_VERSION register?

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why imx6's usdhc hasn't the SDHCI_HOST_VERSION register?

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senixsenix
Contributor I

in the linux sd driver

#define SDHCI_HOST_VERSION0xFE
#define   SDHCI_SPEC_3002

the linux will read the SDHCI_HOST_VERSION(offset 0xFE), and compare with the SDHCI_SPEC_300:

host->version = sdhci_readw(host, SDHCI_HOST_VERSION);

  host->version = (host->version & SDHCI_SPEC_VER_MASK)

  >> SDHCI_SPEC_VER_SHIFT;

  if (host->version > SDHCI_SPEC_300) {

  printk(KERN_ERR "%s: Unknown controller version (%d). "

  "You may experience problems.\n", mmc_hostname(mmc),

  host->version);

  }

but in the imx6XXXrm.pdf , there isn't the SDHCI_HOST_VERSION register.

so, every boot time ,we'll see the "mmc0: Unknown controller version (3). You may experience problems.."

where is the SDHCI_HOST_VERSION register,what it means?

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PeterChan
NXP Employee
NXP Employee

All i.MX6x possess the SDHCI_HOST_VERSION register but this is not documented in the reference manual.

For i.MX6x, the SDHCI_HOST_VERSION register is a 32-bit read only register at base offset 0xFC. Bits [31-16] are reserved. Bits [15-8] is the vendor version number and bits [7-0] is the Host Controller Specification Version.

The unknown SDHCI controller version issue was reported in ENGR00217936 and had been fixed in our recent BSP releases. The code to read the SDHCI_HOST_VERSION register can be found in the function esdhc_readw_le() at file drivers/mmc/host/sdhci-esdhc-imx.c.

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PeterChan
NXP Employee
NXP Employee

All i.MX6x possess the SDHCI_HOST_VERSION register but this is not documented in the reference manual.

For i.MX6x, the SDHCI_HOST_VERSION register is a 32-bit read only register at base offset 0xFC. Bits [31-16] are reserved. Bits [15-8] is the vendor version number and bits [7-0] is the Host Controller Specification Version.

The unknown SDHCI controller version issue was reported in ENGR00217936 and had been fixed in our recent BSP releases. The code to read the SDHCI_HOST_VERSION register can be found in the function esdhc_readw_le() at file drivers/mmc/host/sdhci-esdhc-imx.c.

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senixsenix
Contributor I

ok I see, thanks!

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