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From: Peter Maydell <peter.maydell@linaro.org>
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Date: Mon, 20 Aug 2018 11:32:00 +0100
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Subject: [Qemu-devel] [PULL 13/25] sdhci: add i.MX SD Stable Clock bit
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From: Hans-Erik Floryd <hans-erik.floryd@rt-labs.com>
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>
---
hw/sd/sdhci-internal.h | 2 ++
hw/sd/sdhci.c | 8 ++++++++
2 files changed, 10 insertions(+)
diff --git a/hw/sd/sdhci-internal.h b/hw/sd/sdhci-internal.h
index 756ef3f3c2e..19665fd4013 100644
--- a/hw/sd/sdhci-internal.h
+++ b/hw/sd/sdhci-internal.h
@@ -302,4 +302,6 @@ extern const VMStateDescription sdhci_vmstate;
#define ESDHC_CTRL_4BITBUS (0x1 << 1)
#define ESDHC_CTRL_8BITBUS (0x2 << 1)
=20
+#define ESDHC_PRNSTS_SDSTB (1 << 3)
+
#endif
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 8f58c31265a..81bbf032794 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1651,6 +1651,14 @@ static uint64_t usdhc_read(void *opaque, hwaddr offs=
et, unsigned size)
=20
break;
=20
+ case SDHC_PRNSTS:
+ /* Add SDSTB (SD Clock Stable) bit to PRNSTS */
+ ret =3D sdhci_read(opaque, offset, size) & ~ESDHC_PRNSTS_SDSTB;
+ if (s->clkcon & SDHC_CLOCK_INT_STABLE) {
+ ret |=3D ESDHC_PRNSTS_SDSTB;
+ }
+ break;
+
case ESDHC_DLL_CTRL:
case ESDHC_TUNE_CTRL_STATUS:
case ESDHC_UNDOCUMENTED_REG27:
--=20
2.18.0