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| author | Irene Park <ipark@nvidia.com> | 2020-06-09 13:56:31 -0400 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-07-02 07:11:26 +0000 |
| commit | c8edb70945099fd35a0997d3f3db105efc144e13 (patch) | |
| tree | 5a8c828479f146af8ee0f1004df28913eee2a5e8 /ArmPlatformPkg | |
| parent | 00217f1919270007d7a911f89b32e39b9dcaa907 (diff) | |
| download | edk2-c8edb70945099fd35a0997d3f3db105efc144e13.tar.gz edk2-c8edb70945099fd35a0997d3f3db105efc144e13.tar.bz2 edk2-c8edb70945099fd35a0997d3f3db105efc144e13.zip | |
ArmPlatformPkg/PL011UartLib: Check PID2 if FiFoDepth is zero
PL011UartLib determines its FIFO depth based on the PID2 value but
the register PID2 is not mandatory as per the SBSA spec.
This change won't check PID2 if PcdUartDefaultReceiveFifoDepth is set
to a value > 0.
Signed-off-by: Irene Park <ipark@nvidia.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Diffstat (limited to 'ArmPlatformPkg')
| -rw-r--r-- | ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c | 10 | ||||
| -rw-r--r-- | ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.inf | 1 |
2 files changed, 8 insertions, 3 deletions
diff --git a/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c b/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c index 801990d955..f1015b1fce 100644 --- a/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c +++ b/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.c @@ -78,10 +78,14 @@ PL011UartInitializePort ( UINT32 Integer;
UINT32 Fractional;
UINT32 HardwareFifoDepth;
+ UINT32 UartPid2;
+
+ HardwareFifoDepth = FixedPcdGet16 (PcdUartDefaultReceiveFifoDepth);
+ if (HardwareFifoDepth == 0) {
+ UartPid2 = MmioRead32 (UartBase + UARTPID2);
+ HardwareFifoDepth = (PL011_UARTPID2_VER (UartPid2) > PL011_VER_R1P4) ? 32 : 16;
+ }
- HardwareFifoDepth = (PL011_UARTPID2_VER (MmioRead32 (UartBase + UARTPID2)) \
- > PL011_VER_R1P4) \
- ? 32 : 16 ;
// The PL011 supports a buffer of 1, 16 or 32 chars. Therefore we can accept
// 1 char buffer as the minimum FIFO size. Because everything can be rounded
// down, there is no maximum FIFO size.
diff --git a/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.inf b/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.inf index d99e89fe00..e3da507988 100644 --- a/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.inf +++ b/ArmPlatformPkg/Library/PL011UartLib/PL011UartLib.inf @@ -30,6 +30,7 @@ ArmPlatformPkg/ArmPlatformPkg.dec
[FixedPcd]
+ gEfiMdePkgTokenSpaceGuid.PcdUartDefaultReceiveFifoDepth
gEfiMdeModulePkgTokenSpaceGuid.PcdSerialBaudRate
gArmPlatformTokenSpaceGuid.PL011UartInteger
|