diff options
| author | Kaustabh Chakraborty <[email protected]> | 2025-10-17 20:54:09 +0530 |
|---|---|---|
| committer | Peng Fan <[email protected]> | 2025-10-30 10:11:17 +0800 |
| commit | e6b66e9f338fe9c8a6bc498399e736f7ec9deb10 (patch) | |
| tree | 33218dc282e49641a788dc3eaba292fd955e0dff /include | |
| parent | ae4601959202f4ea21c8a1aa42c5d2d894b03d57 (diff) | |
mmc: dw_mmc: add voltage switch command flag
During a voltage switch command (CMD11, opcode: SD_CMD_SWITCH_UHS18V),
certain hosts tend to stop responding to subsequent commands. This is
addressed by introducing an additional command flag,
DWMCI_CMD_VOLT_SWITCH.
The associated interrupt bit is defined as DWMCI_INTMSK_VOLTSW. This is
set high when a voltage switch is issued, this needs to be waited for
and set to low. Implement the same in the timeout loop. Do note that
since DWMCI_INTMSK_VOLTSW shares the same bit as DWMCI_INTMSK_HTO (bit
10), the interrupt bit needs to be polled for only if the volt switch
command is issued.
DWMCI_CMD_VOLT_SWITCH also needs to be set for subsequent clken commands
after the volt switch. To ensure this, add a boolean member in the host
private struct (herein named volt_switching), which informs if the last
command issued was for volt switching or not.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Peng Fan <[email protected]>
Diffstat (limited to 'include')
| -rw-r--r-- | include/dwmmc.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/dwmmc.h b/include/dwmmc.h index 639a2d28e78..47e3220985e 100644 --- a/include/dwmmc.h +++ b/include/dwmmc.h @@ -72,6 +72,7 @@ #define DWMCI_INTMSK_RTO BIT(8) #define DWMCI_INTMSK_DRTO BIT(9) #define DWMCI_INTMSK_HTO BIT(10) +#define DWMCI_INTMSK_VOLTSW BIT(10) /* overlap! */ #define DWMCI_INTMSK_FRUN BIT(11) #define DWMCI_INTMSK_HLE BIT(12) #define DWMCI_INTMSK_SBE BIT(13) @@ -104,6 +105,7 @@ #define DWMCI_CMD_ABORT_STOP BIT(14) #define DWMCI_CMD_PRV_DAT_WAIT BIT(13) #define DWMCI_CMD_UPD_CLK BIT(21) +#define DWMCI_CMD_VOLT_SWITCH BIT(28) #define DWMCI_CMD_USE_HOLD_REG BIT(29) #define DWMCI_CMD_START BIT(31) @@ -190,6 +192,7 @@ struct dwmci_idmac_regs { * @cfg: Internal MMC configuration, for !CONFIG_BLK cases * @fifo_mode: Use FIFO mode (not DMA) to read and write data * @dma_64bit_address: Whether DMA supports 64-bit address mode or not + * @volt_switching: Whether SD voltage switching is in process or not * @regs: Registers that can vary for different DW MMC block versions */ struct dwmci_host { @@ -229,6 +232,7 @@ struct dwmci_host { bool fifo_mode; bool dma_64bit_address; + bool volt_switching; const struct dwmci_idmac_regs *regs; }; |