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authorLudovic Barre <ludovic.barre@st.com>2018-12-06 18:13:31 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2018-12-17 10:26:24 +0300
commitc8073e52851477514e98a032ae70f2dc8be19d32 (patch)
tree9b75d1c25698f21025779b3fed2768003e9c0304 /drivers/mmc
parent9e89a1526a9c23ce81584a0b612174342c611e47 (diff)
downloadlinux-c8073e52851477514e98a032ae70f2dc8be19d32.tar.xz
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/mmci.c6
-rw-r--r--drivers/mmc/host/mmci.h2
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 13fa640d86d6..e352f5ad5801 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -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)
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 550dd3914461..24229097d05c 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -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;