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sdhci: add i.MX SD Stable Clock bit

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Add the ESDHC PRSSTAT_SDSTB bit, using the value of SDHC_CLOCK_INT_STABLE.
Freescale recommends checking this bit when changing clock frequency.

Signed-off-by: Hans-Erik Floryd <hans-erik.floryd@rt-labs.com>
Message-id: 1534507843-4251-1-git-send-email-hans-erik.floryd@rt-labs.com
[PMM: fixed indentation]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Hans-Erik Floryd 2018-08-20 11:24:32 +01:00 committed by Peter Maydell
parent 22907d2b81
commit 6bfd06da6e
2 changed files with 10 additions and 0 deletions
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2
hw/sd/sdhci-internal.h
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@ -302,4 +302,6 @@ extern const VMStateDescription sdhci_vmstate;
#define ESDHC_CTRL_4BITBUS (0x1 << 1)
#define ESDHC_CTRL_8BITBUS (0x2 << 1)
#define ESDHC_PRNSTS_SDSTB (1 << 3)
#endif

8
hw/sd/sdhci.c
View File

@ -1651,6 +1651,14 @@ static uint64_t usdhc_read(void *opaque, hwaddr offset, unsigned size)
break;
case SDHC_PRNSTS:
/* Add SDSTB (SD Clock Stable) bit to PRNSTS */
ret = sdhci_read(opaque, offset, size) & ~ESDHC_PRNSTS_SDSTB;
if (s->clkcon & SDHC_CLOCK_INT_STABLE) {
ret |= ESDHC_PRNSTS_SDSTB;
}
break;
case ESDHC_DLL_CTRL:
case ESDHC_TUNE_CTRL_STATUS:
case ESDHC_UNDOCUMENTED_REG27: