From: oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 2 Aug 2012 10:14:52 +0000 (+0000)
Subject: EmbeddedPkg/MmcDxe: Avoid nanosecond delay when command succeeds
X-Git-Tag: edk2-stable201903~13196
X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=699e34adeb63496bba9956e46a98b393ad68b94b

EmbeddedPkg/MmcDxe: Avoid nanosecond delay when command succeeds

Check response just after receiving it to avoid the delay.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13584 6f19259b-4bc3-4df7-8a09-765794883524
---

diff --git a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
index 32a85196ad..7452b55391 100644
--- a/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
+++ b/EmbeddedPkg/Universal/MmcDxe/MmcBlockIo.c
@@ -628,7 +628,10 @@ MmcIoBlocks (
     while(!(Response[0] & MMC_R0_READY_FOR_DATA) && (MMC_R0_CURRENTSTATE(Response) != MMC_R0_STATE_TRAN) && Timeout--) {
       Status = MmcHost->SendCommand (MmcHost, MMC_CMD13, CmdArg);
       if (!EFI_ERROR(Status)) {
-        MmcHost->ReceiveResponse (MmcHost, MMC_RESPONSE_TYPE_R1,Response);
+        MmcHost->ReceiveResponse (MmcHost, MMC_RESPONSE_TYPE_R1, Response);
+        if ((Response[0] & MMC_R0_READY_FOR_DATA)) {
+          break;  // Prevents delay once finished
+        }
       }
       NanoSecondDelay(100);
       Timeout--;