Revision: 14526
http://sourceforge.net/p/edk2/code/14526
Author: oliviermartin
Date: 2013-08-06 12:11:13 +0000 (Tue, 06 Aug 2013)
Log Message:
-----------
ArmPlatformPkg/PL180MciDxe: Increased the TPL at the highest priority to
disable interrupts
This change prevent any interrupt to disturb the PL180 data transfer.
If the data transfer is not fast enough, we get UNDERRUN error.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <[email protected]>
Modified Paths:
--------------
trunk/edk2/ArmPlatformPkg/Drivers/PL180MciDxe/PL180Mci.c
Modified: trunk/edk2/ArmPlatformPkg/Drivers/PL180MciDxe/PL180Mci.c
===================================================================
--- trunk/edk2/ArmPlatformPkg/Drivers/PL180MciDxe/PL180Mci.c 2013-08-06
12:10:25 UTC (rev 14525)
+++ trunk/edk2/ArmPlatformPkg/Drivers/PL180MciDxe/PL180Mci.c 2013-08-06
12:11:13 UTC (rev 14526)
@@ -217,12 +217,17 @@
UINTN Status;
EFI_STATUS RetVal;
UINTN DataCtrlReg;
+ EFI_TPL Tpl;
RetVal = EFI_SUCCESS;
// Read data from the RX FIFO
Loop = 0;
Finish = MMCI0_BLOCKLEN / 4;
+
+ // Raise the TPL at the highest level to disable Interrupts.
+ Tpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+
do {
// Read the Status flags
Status = MmioRead32 (MCI_STATUS_REG);
@@ -270,6 +275,9 @@
}
} while ((Loop < Finish));
+ // Restore Tpl
+ gBS->RestoreTPL (Tpl);
+
// Clear Status flags
MmioWrite32 (MCI_CLEAR_STATUS_REG, MCI_CLR_ALL_STATUS);
@@ -294,6 +302,7 @@
UINTN Status;
EFI_STATUS RetVal;
UINTN DataCtrlReg;
+ EFI_TPL Tpl;
RetVal = EFI_SUCCESS;
@@ -301,6 +310,10 @@
Loop = 0;
Finish = MMCI0_BLOCKLEN / 4;
Timer = MMCI0_TIMEOUT * 100;
+
+ // Raise the TPL at the highest level to disable Interrupts.
+ Tpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
+
do {
// Read the Status flags
Status = MmioRead32 (MCI_STATUS_REG);
@@ -345,6 +358,9 @@
}
} while (Loop < Finish);
+ // Restore Tpl
+ gBS->RestoreTPL (Tpl);
+
// Wait for FIFO to drain
Timer = MMCI0_TIMEOUT * 60;
Status = MmioRead32 (MCI_STATUS_REG);
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