Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 hw/sd/sdhci-internal.h | 6 ++++--
 hw/sd/sdhci.c          | 8 ++------
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/hw/sd/sdhci-internal.h b/hw/sd/sdhci-internal.h
index e941bc2386..df240ea046 100644
--- a/hw/sd/sdhci-internal.h
+++ b/hw/sd/sdhci-internal.h
@@ -24,6 +24,8 @@
 #ifndef SDHCI_INTERNAL_H
 #define SDHCI_INTERNAL_H
 
+#include "hw/registerfields.h"
+
 /* R/W SDMA System Address register 0x0 */
 #define SDHC_SYSAD                     0x00
 
@@ -77,8 +79,8 @@
 #define SDHC_SPACE_AVAILABLE           0x00000400
 #define SDHC_DATA_AVAILABLE            0x00000800
 #define SDHC_CARD_PRESENT              0x00010000
-#define SDHC_CARD_DETECT               0x00040000
-#define SDHC_WRITE_PROTECT             0x00080000
+FIELD(SDHC_PRNSTS, CARD_DETECT,        18, 1);
+FIELD(SDHC_PRNSTS, WRITE_PROTECT,      19, 1);
 #define TRANSFERRING_DATA(x)           \
     ((x) & (SDHC_DOING_READ | SDHC_DOING_WRITE))
 
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index dd42820a38..586db181e3 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -160,12 +160,8 @@ static void sdhci_set_readonly(DeviceState *dev, bool level)
 {
     SDHCIState *s = (SDHCIState *)dev;
 
-    if (level) {
-        s->prnsts &= ~SDHC_WRITE_PROTECT;
-    } else {
-        /* Write enabled */
-        s->prnsts |= SDHC_WRITE_PROTECT;
-    }
+    /* Write enabled */
+    s->prnsts = FIELD_DP32(s->prnsts, SDHC_PRNSTS, WRITE_PROTECT, level);
 }
 
 static void sdhci_reset(SDHCIState *s)
-- 
2.15.1