Commit c8073e52 authored by Ludovic Barre's avatar Ludovic Barre Committed by Ulf Hansson
Browse files

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: default avatarLudovic Barre <ludovic.barre@st.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 9e89a152

drivers/mmc/host/mmci.c

+6 −0
Original line number Diff line number Diff line
@@ -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)

drivers/mmc/host/mmci.h

+2 −0
Original line number Diff line number Diff line
@@ -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;

CRA Git | Maintained and supported by SUSTech CRA and CCSE