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ti: sdhci: Correct voltage caps

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ti,dual-volt property say that the eMMC support 1.8V and 3.3V not 3.0V
Use the correct caps for the mmc stack.
Note that the MMCHS_SD_CAPA register can only be written once after bootup
so if one is using a u-boot compiled with eMMC support (this is the default)
this code is a no-op but just in case someone have u-boot compiled without
eMMC support this make eMMC works when the kernel is booted.

MFC after:	1 week
This commit is contained in:
Emmanuel Vadot 2019-08-19 14:33:22 +00:00
parent cf2ba452a0
commit 165b9f965d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=351218
1 changed files with 12 additions and 10 deletions
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22
sys/arm/ti/ti_sdhci.c
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@ -482,15 +482,14 @@ ti_sdhci_hw_init(device_t dev)
* The attach() routine has examined fdt data and set flags in
* slot.host.caps to reflect what voltages we can handle. Set those
* values in the CAPA register. The manual says that these values can
* only be set once, "before initialization" whatever that means, and
* that they survive a reset. So maybe doing this will be a no-op if
* u-boot has already initialized the hardware.
* only be set once, and that they survive a reset so unless u-boot didn't
* set this register this code is a no-op.
*/
regval = ti_mmchs_read_4(sc, MMCHS_SD_CAPA);
if (sc->slot.host.caps & MMC_OCR_LOW_VOLTAGE)
regval |= MMCHS_SD_CAPA_VS18;
if (sc->slot.host.caps & (MMC_OCR_290_300 | MMC_OCR_300_310))
regval |= MMCHS_SD_CAPA_VS30;
if (sc->slot.host.caps & (MMC_OCR_320_330 | MMC_OCR_330_340))
regval |= MMCHS_SD_CAPA_VS33;
ti_mmchs_write_4(sc, MMCHS_SD_CAPA, regval);
/* Set initial host configuration (1-bit, std speed, pwr off). */
@ -524,17 +523,20 @@ ti_sdhci_attach(device_t dev)
}
/*
* The hardware can inherently do dual-voltage (1p8v, 3p0v) on the first
* The hardware can inherently do dual-voltage (1p8v, 3p3v) on the first
* device, and only 1p8v on other devices unless an external transceiver
* is used. The only way we could know about a transceiver is fdt data.
* Note that we have to do this before calling ti_sdhci_hw_init() so
* that it can set the right values in the CAPA register, which can only
* be done once and never reset.
*/
sc->slot.host.caps |= MMC_OCR_LOW_VOLTAGE;
if (sc->mmchs_clk_id == MMC1_CLK || OF_hasprop(node, "ti,dual-volt")) {
sc->slot.host.caps |= MMC_OCR_290_300 | MMC_OCR_300_310;
}
if (OF_hasprop(node, "ti,dual-volt")) {
sc->slot.host.caps |= MMC_OCR_LOW_VOLTAGE | MMC_OCR_320_330 | MMC_OCR_330_340;
} else if (OF_hasprop(node, "no-1-8-v")) {
sc->slot.host.caps |= MMC_OCR_320_330 | MMC_OCR_330_340;
} else
sc->slot.host.caps |= MMC_OCR_LOW_VOLTAGE;
/*
* Set the offset from the device's memory start to the MMCHS registers.