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SD : Updated CMD 6 implememtation. 

For setting high speed in SD card,
First CMD 6 (Switch) is send to check if card supports High Speed and
Second command is send to switch card to high speed mode.

In current inplementation, CMD 6 was sent only once to switch the
card into HS mode without checking if card supports HS or not, which is
not as per specification and also we are not setting the HS i.e. 50000000
but directly asking the card to switch to 26000000 which is incorrect as
SD card supports either 25000000 or 50000000.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Meenakshi Aggarwal <meenakshi.aggarwal@nxp.com>
Reviewed-by: Jun Nie <jun.nie@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Meenakshi Aggarwal 2017-09-07 19:47:53 +05:30 committed by Leif Lindholm
parent 3d43616632
commit ea21f1d98d
2 changed files with 57 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
EmbeddedPkg/Universal/MmcDxe/Mmc.h
View File

@ -64,6 +64,14 @@
#define EMMC_CMD6_ARG_VALUE(x) (((x) & 0xFF) << 8)
#define EMMC_CMD6_ARG_CMD_SET(x) (((x) & 0x7) << 0)
#define SWITCH_CMD_DATA_LENGTH 64
#define SD_HIGH_SPEED_SUPPORTED 0x20000
#define SD_DEFAULT_SPEED 25000000
#define SD_HIGH_SPEED 50000000
#define SWITCH_CMD_SUCCESS_MASK 0x0f000000
#define BUSWIDTH_4 4
typedef enum {
UNKNOWN_CARD,
MMC_CARD, //MMC card

55
EmbeddedPkg/Universal/MmcDxe/MmcIdentification.c Normal file → Executable file
View File

@ -317,6 +317,23 @@ InitializeEmmcDevice (
return Status;
}
STATIC
UINT32
CreateSwitchCmdArgument (
IN UINT32 Mode,
IN UINT8 Group,
IN UINT8 Value
)
{
UINT32 Argument;
Argument = Mode << 31 | 0x00FFFFFF;
Argument &= ~(0xF << (Group * 4));
Argument |= Value << (Group * 4);
return Argument;
}
STATIC
EFI_STATUS
InitializeSdMmcDevice (
@ -326,6 +343,7 @@ InitializeSdMmcDevice (
UINT32 CmdArg;
UINT32 Response[4];
UINT32 Buffer[128];
UINT32 Speed;
UINTN BlockSize;
UINTN CardSize;
UINTN NumBlocks;
@ -334,6 +352,7 @@ InitializeSdMmcDevice (
EFI_STATUS Status;
EFI_MMC_HOST_PROTOCOL *MmcHost;
Speed = SD_DEFAULT_SPEED;
MmcHost = MmcHostInstance->MmcHost;
// Send a command to get Card specific data
@ -439,21 +458,45 @@ InitializeSdMmcDevice (
}
}
if (CccSwitch) {
/* SD Switch, Mode:1, Group:0, Value:1 */
CmdArg = 1 << 31 | 0x00FFFFFF;
CmdArg &= ~(0xF << (0 * 4));
CmdArg |= 1 << (0 * 4);
/* SD Switch, Mode:0, Group:0, Value:0 */
CmdArg = CreateSwitchCmdArgument(0, 0, 0);
Status = MmcHost->SendCommand (MmcHost, MMC_CMD6, CmdArg);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a (MMC_CMD6): Error and Status = %r\n", __FUNCTION__, Status));
return Status;
} else {
Status = MmcHost->ReadBlockData (MmcHost, 0, 64, Buffer);
Status = MmcHost->ReadBlockData (MmcHost, 0, SWITCH_CMD_DATA_LENGTH, Buffer);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a (MMC_CMD6): ReadBlockData Error and Status = %r\n", __FUNCTION__, Status));
return Status;
}
}
if (!(Buffer[3] & SD_HIGH_SPEED_SUPPORTED)) {
DEBUG ((DEBUG_ERROR, "%a : High Speed not supported by Card %r\n", __FUNCTION__, Status));
return Status;
}
Speed = SD_HIGH_SPEED;
/* SD Switch, Mode:1, Group:0, Value:1 */
CmdArg = CreateSwitchCmdArgument(1, 0, 1);
Status = MmcHost->SendCommand (MmcHost, MMC_CMD6, CmdArg);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a (MMC_CMD6): Error and Status = %r\n", __FUNCTION__, Status));
return Status;
} else {
Status = MmcHost->ReadBlockData (MmcHost, 0, SWITCH_CMD_DATA_LENGTH, Buffer);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a (MMC_CMD6): ReadBlockData Error and Status = %r\n", __FUNCTION__, Status));
return Status;
}
if ((Buffer[4] & SWITCH_CMD_SUCCESS_MASK) != 0x01000000) {
DEBUG((DEBUG_ERROR, "Problem switching SD card into high-speed mode\n"));
return Status;
}
}
}
if (Scr.SD_BUS_WIDTHS & SD_BUS_WIDTH_4BIT) {
CmdArg = MmcHostInstance->CardInfo.RCA << 16;
@ -470,7 +513,7 @@ InitializeSdMmcDevice (
}
}
if (MMC_HOST_HAS_SETIOS(MmcHost)) {
Status = MmcHost->SetIos (MmcHost, 26 * 1000 * 1000, 4, EMMCBACKWARD);
Status = MmcHost->SetIos (MmcHost, Speed, BUSWIDTH_4, EMMCBACKWARD);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "%a (SetIos): Error and Status = %r\n", __FUNCTION__, Status));
return Status;