From: Jun Nie <jun.nie@linaro.org>
To: ard.biesheuvel@linaro.org, leif.lindholm@linaro.org,
haojian.zhuang@linaro.org, edk2-devel@lists.01.org
Cc: shawn.guo@linaro.org, jason.liu@linaro.org, Jun Nie <jun.nie@linaro.org>
Subject: [PATCH v2 1/2] EmbeddedPkg/DwEmmcDxe: limit max clock for platform
Date: Wed, 5 Jul 2017 16:27:07 +0800 [thread overview]
Message-ID: <1499243228-1225-1-git-send-email-jun.nie@linaro.org> (raw)
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>
---
EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c | 4 ++++
EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.inf | 1 +
EmbeddedPkg/EmbeddedPkg.dec | 1 +
3 files changed, 6 insertions(+)
diff --git a/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c b/EmbeddedPkg/Drivers/DwEmmcDxe/DwEmmcDxe.c
index fe23d11..bb26b69 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 e3c8313..99b4f99 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 5ea2f22..2da9b2f 100644
--- a/EmbeddedPkg/EmbeddedPkg.dec
+++ b/EmbeddedPkg/EmbeddedPkg.dec
@@ -169,6 +169,7 @@
# DwEmmc Driver PCDs
gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeBaseAddress|0x0|UINT32|0x00000035
gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeClockFrequencyInHz|0x0|UINT32|0x00000036
+ gEmbeddedTokenSpaceGuid.PcdDwEmmcDxeMaxClockFreqInHz|0x0|UINT32|0x00000037
#
# Android FastBoot
--
1.9.1
next reply other threads:[~2017-07-05 8:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-05 8:27 Jun Nie [this message]
2017-07-05 8:27 ` [PATCH v2 2/2] EmbeddedPkg/DwEmmc: Adjust FIFO threshold Jun Nie
2017-07-06 15:22 ` Leif Lindholm
2017-07-07 9:13 ` Jun Nie
2017-07-06 15:24 ` [PATCH v2 1/2] EmbeddedPkg/DwEmmcDxe: limit max clock for platform Leif Lindholm
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