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| author | Jun Nie <jun.nie@linaro.org> | 2017-07-05 16:27:07 +0800 |
|---|---|---|
| committer | Leif Lindholm <leif.lindholm@linaro.org> | 2017-07-17 17:54:06 +0100 |
| commit | d4102f68dceb36fa8f07af9fa3d24b0da9f173bf (patch) | |
| tree | f4b56f8f536c6cd03173e7800309f345304a7761 /EmbeddedPkg | |
| parent | d4f6c35c84b8503bc2acde89a7adb7ee05c56516 (diff) | |
| download | edk2-d4102f68dceb36fa8f07af9fa3d24b0da9f173bf.tar.gz edk2-d4102f68dceb36fa8f07af9fa3d24b0da9f173bf.tar.bz2 edk2-d4102f68dceb36fa8f07af9fa3d24b0da9f173bf.zip | |
EmbeddedPkg/DwEmmcDxe: limit max clock for platform
Some boards may have max clock limitation. Add a Pcd to notify
driver.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Diffstat (limited to 'EmbeddedPkg')
| -rw-r--r-- | EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c | 4 | ||||
| -rw-r--r-- | EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.inf | 1 | ||||
| -rw-r--r-- | EmbeddedPkg/EmbeddedPkg.dec | 1 |
3 files changed, 6 insertions, 0 deletions
diff --git a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c index fe23d113ee..bb26b69fd1 100644 --- a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c +++ b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c @@ -560,6 +560,10 @@ DwEmmcSetIos ( EFI_STATUS Status = EFI_SUCCESS;
UINT32 Data;
+ if ((PcdGet32 (PcdDwEmmcDxeMaxClockFreqInHz) != 0) &&
+ (BusClockFreq > PcdGet32 (PcdDwEmmcDxeMaxClockFreqInHz))) {
+ return EFI_UNSUPPORTED;
+ }
if (TimingMode != EMMCBACKWARD) {
Data = MmioRead32 (DWEMMC_UHSREG);
switch (TimingMode) {
diff --git a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.inf b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.inf index e3c8313bc5..99b4f990f6 100644 --- a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.inf +++ b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.inf @@ -48,6 +48,7 @@ [Pcd]
gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeBaseAddress
gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeClockFrequencyInHz
+ gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeMaxClockFreqInHz
[Depex]
TRUE
diff --git a/EmbeddedPkg/EmbeddedPkg.dec b/EmbeddedPkg/EmbeddedPkg.dec index 0d4a0625a3..3cb30a49cf 100644 --- a/EmbeddedPkg/EmbeddedPkg.dec +++ b/EmbeddedPkg/EmbeddedPkg.dec @@ -167,6 +167,7 @@ # DwEmmc Driver PCDs
gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeBaseAddress|0x0|UINT32|0x00000035
gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeClockFrequencyInHz|0x0|UINT32|0x00000036
+ gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeMaxClockFreqInHz|0x0|UINT32|0x00000037
#
# Android FastBoot
|