3 files changed, 17 insertions, 1 deletions
diff --git a/arch/mips/loongson/common/cs5536/cs5536_ehci.c b/arch/mips/loongson/common/cs5536/cs5536_ehci.c
index eaf8b86e3318..5b5cbba699b3 100644
--- a/arch/mips/loongson/common/cs5536/cs5536_ehci.c
+++ b/arch/mips/loongson/common/cs5536/cs5536_ehci.c
@@ -49,6 +49,8 @@ void pci_ehci_write_reg(int reg, u32 value)
 			lo |= SOFT_BAR_EHCI_FLAG;
 			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
 		} else if ((value & 0x01) == 0x00) {
+			_rdmsr(USB_MSR_REG(USB_EHCI), &hi, &lo);
+			lo = value;
 			_wrmsr(USB_MSR_REG(USB_EHCI), hi, lo);
 
 			value &= 0xfffffff0;
diff --git a/arch/mips/loongson/common/cs5536/cs5536_ide.c b/arch/mips/loongson/common/cs5536/cs5536_ide.c
index 9a96b5664c78..7ebf17a949a9 100644
--- a/arch/mips/loongson/common/cs5536/cs5536_ide.c
+++ b/arch/mips/loongson/common/cs5536/cs5536_ide.c
@@ -51,6 +51,7 @@ void pci_ide_write_reg(int reg, u32 value)
 			lo |= SOFT_BAR_IDE_FLAG;
 			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
 		} else if (value & 0x01) {
+			_rdmsr(IDE_MSR_REG(IDE_IO_BAR), &hi, &lo);
 			lo = (value & 0xfffffff0) | 0x1;
 			_wrmsr(IDE_MSR_REG(IDE_IO_BAR), hi, lo);
 
@@ -65,19 +66,30 @@ void pci_ide_write_reg(int reg, u32 value)
 			_rdmsr(DIVIL_MSR_REG(DIVIL_BALL_OPTS), &hi, &lo);
 			lo |= 0x01;
 			_wrmsr(DIVIL_MSR_REG(DIVIL_BALL_OPTS), hi, lo);
-		} else
+		} else {
+			_rdmsr(IDE_MSR_REG(IDE_CFG), &hi, &lo);
+			lo = value;
 			_wrmsr(IDE_MSR_REG(IDE_CFG), hi, lo);
+		}
 		break;
 	case PCI_IDE_DTC_REG:
+		_rdmsr(IDE_MSR_REG(IDE_DTC), &hi, &lo);
+		lo = value;
 		_wrmsr(IDE_MSR_REG(IDE_DTC), hi, lo);
 		break;
 	case PCI_IDE_CAST_REG:
+		_rdmsr(IDE_MSR_REG(IDE_CAST), &hi, &lo);
+		lo = value;
 		_wrmsr(IDE_MSR_REG(IDE_CAST), hi, lo);
 		break;
 	case PCI_IDE_ETC_REG:
+		_rdmsr(IDE_MSR_REG(IDE_ETC), &hi, &lo);
+		lo = value;
 		_wrmsr(IDE_MSR_REG(IDE_ETC), hi, lo);
 		break;
 	case PCI_IDE_PM_REG:
+		_rdmsr(IDE_MSR_REG(IDE_INTERNAL_PM), &hi, &lo);
+		lo = value;
 		_wrmsr(IDE_MSR_REG(IDE_INTERNAL_PM), hi, lo);
 		break;
 	default:
diff --git a/arch/mips/loongson/common/cs5536/cs5536_ohci.c b/arch/mips/loongson/common/cs5536/cs5536_ohci.c
index db5900aadd6b..bdedf512baf7 100644
--- a/arch/mips/loongson/common/cs5536/cs5536_ohci.c
+++ b/arch/mips/loongson/common/cs5536/cs5536_ohci.c
@@ -49,6 +49,8 @@ void pci_ohci_write_reg(int reg, u32 value)
 			lo |= SOFT_BAR_OHCI_FLAG;
 			_wrmsr(GLCP_MSR_REG(GLCP_SOFT_COM), hi, lo);
 		} else if ((value & 0x01) == 0x00) {
+			_rdmsr(USB_MSR_REG(USB_OHCI), &hi, &lo);
+			lo = value;
 			_wrmsr(USB_MSR_REG(USB_OHCI), hi, lo);
 
 			value &= 0xfffffff0;