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mmc: mmci: add variant property to set command stop bit 

On cmd12 (STOP_TRANSMISSION), STM32 sdmmc variant needs to set
cmdstop bit in command register. The CPSM ("Command Path State Machine")
treats the command as a Stop Transmission command and signals
abort to the DPSM ("Data Path State Machine").

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ludovic Barre 2018-12-06 16:13:31 +01:00 committed by Ulf Hansson
parent 9e89a1526a
commit c8073e5285
2 changed files with 8 additions and 0 deletions
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6
drivers/mmc/host/mmci.c
View File

@ -21,6 +21,7 @@
#include <linux/err.h>
#include <linux/highmem.h>
#include <linux/log2.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/pm.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
@ -274,6 +275,7 @@ static struct variant_data variant_stm32_sdmmc = {
.cmdreg_lrsp_crc = MCI_CPSM_STM32_LRSP_CRC,
.cmdreg_srsp_crc = MCI_CPSM_STM32_SRSP_CRC,
.cmdreg_srsp = MCI_CPSM_STM32_SRSP,
.cmdreg_stop = MCI_CPSM_STM32_CMDSTOP,
.data_cmd_enable = MCI_CPSM_STM32_CMDTRANS,
.irq_pio_mask = MCI_IRQ_PIO_STM32_MASK,
.datactrl_first = true,
@ -1100,6 +1102,10 @@ mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
mmci_reg_delay(host);
}
if (host->variant->cmdreg_stop &&
cmd->opcode == MMC_STOP_TRANSMISSION)
c |= host->variant->cmdreg_stop;
c |= cmd->opcode | host->variant->cmdreg_cpsm_enable;
if (cmd->flags & MMC_RSP_PRESENT) {
if (cmd->flags & MMC_RSP_136)

2
drivers/mmc/host/mmci.h
View File

@ -264,6 +264,7 @@ struct mmci_host;
* @cmdreg_lrsp_crc: enable value for long response with crc
* @cmdreg_srsp_crc: enable value for short response with crc
* @cmdreg_srsp: enable value for short response without crc
* @cmdreg_stop: enable value for stop and abort transmission
* @datalength_bits: number of bits in the MMCIDATALENGTH register
* @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
* is asserted (likewise for RX)
@ -316,6 +317,7 @@ struct variant_data {
unsigned int cmdreg_lrsp_crc;
unsigned int cmdreg_srsp_crc;
unsigned int cmdreg_srsp;
unsigned int cmdreg_stop;
unsigned int datalength_bits;
unsigned int fifosize;
unsigned int fifohalfsize;