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sd: sdhci: Implement basic vendor specific register support

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The Linux kernel's IMX code now uses vendor specific commands.
This results in endless warnings when booting the Linux kernel.

sdhci-esdhc-imx 2194000.usdhc: esdhc_wait_for_card_clock_gate_off:
	card clock still not gate off in 100us!.

Implement support for the vendor specific command implemented in IMX hardware
to be able to avoid this warning.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Message-id: 20200603145258.195920-2-linux@roeck-us.net
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Guenter Roeck 2020-06-16 10:32:29 +01:00 • committed by Peter Maydell
parent 8095508a9d
commit 3b2d81766f
3 changed files with 27 additions and 1 deletions
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18
hw/sd/sdhci.c
View file

@ -1569,11 +1569,13 @@ static uint64_t usdhc_read(void *opaque, hwaddr offset, unsigned size)
}
break;
case ESDHC_VENDOR_SPEC:
ret = s->vendor_spec;
break;
case ESDHC_DLL_CTRL:
case ESDHC_TUNE_CTRL_STATUS:
case ESDHC_UNDOCUMENTED_REG27:
case ESDHC_TUNING_CTRL:
case ESDHC_VENDOR_SPEC:
case ESDHC_MIX_CTRL:
case ESDHC_WTMK_LVL:
ret = 0;
@ -1596,7 +1598,21 @@ usdhc_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
case ESDHC_UNDOCUMENTED_REG27:
case ESDHC_TUNING_CTRL:
case ESDHC_WTMK_LVL:
break;
case ESDHC_VENDOR_SPEC:
s->vendor_spec = value;
switch (s->vendor) {
case SDHCI_VENDOR_IMX:
if (value & ESDHC_IMX_FRC_SDCLK_ON) {
s->prnsts &= ~SDHC_IMX_CLOCK_GATE_OFF;
} else {
s->prnsts |= SDHC_IMX_CLOCK_GATE_OFF;
}
break;
default:
break;
}
break;
case SDHC_HOSTCTL: