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EmbeddedPkg: MmcDxe: wait OCR busy bit free

According to eMMC spec, OCR.PowerUp bit is also busy bit. If the busy
bit is '0', CMD1 should be sent and OCR should be fetched again. And add
a timeout counter on the repeated steps.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Haojian Zhuang 7 년 전
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1개의 변경된 파일8개의 추가작업 그리고 3개의 파일을 삭제
  1. 8 3
      EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c

+ 8 - 3
EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c

@@ -222,14 +222,19 @@ MmcIdentificationMode (
 
   // Send CMD1 to get OCR (MMC)
   // This command only valid for MMC and eMMC
-  Status = MmcHost->SendCommand (MmcHost, MMC_CMD1, EMMC_CMD1_CAPACITY_GREATER_THAN_2GB);
-  if (Status == EFI_SUCCESS) {
+  Timeout = MAX_RETRY_COUNT;
+  do {
+    Status = MmcHost->SendCommand (MmcHost, MMC_CMD1, EMMC_CMD1_CAPACITY_GREATER_THAN_2GB);
+    if (EFI_ERROR (Status))
+      break;
     Status = MmcHost->ReceiveResponse (MmcHost, MMC_RESPONSE_TYPE_OCR, (UINT32 *)&OcrResponse);
     if (EFI_ERROR (Status)) {
       DEBUG ((EFI_D_ERROR, "MmcIdentificationMode() : Failed to receive OCR, Status=%r.\n", Status));
       return Status;
     }
-
+    Timeout--;
+  } while (!OcrResponse.Ocr.PowerUp && (Timeout > 0));
+  if (Status == EFI_SUCCESS) {
     if (!OcrResponse.Ocr.PowerUp) {
       DEBUG ((EFI_D_ERROR, "MmcIdentificationMode(MMC_CMD1): Card initialisation failure, Status=%r.\n", Status));
       return EFI_DEVICE_ERROR;