diff options
Diffstat (limited to 'drivers/spi/spi-bcm63xx-hsspi.c')
| -rw-r--r-- | drivers/spi/spi-bcm63xx-hsspi.c | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/drivers/spi/spi-bcm63xx-hsspi.c b/drivers/spi/spi-bcm63xx-hsspi.c index 55cbe7deba08..af51488659b8 100644 --- a/drivers/spi/spi-bcm63xx-hsspi.c +++ b/drivers/spi/spi-bcm63xx-hsspi.c @@ -219,7 +219,8 @@ static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t) unsigned long limit; bcm63xx_hsspi_set_clk(bs, spi, t->speed_hz); - bcm63xx_hsspi_set_cs(bs, spi->chip_select, true); + if (!t->cs_off) + bcm63xx_hsspi_set_cs(bs, spi->chip_select, true); if (tx && rx) opcode = HSSPI_OP_READ_WRITE; @@ -338,7 +339,7 @@ static int bcm63xx_hsspi_transfer_one(struct spi_master *master, struct spi_device *spi = msg->spi; int status = -EINVAL; int dummy_cs; - u32 reg; + bool keep_cs = false; mutex_lock(&bs->msg_mutex); /* This controller does not support keeping CS active during idle. @@ -367,16 +368,28 @@ static int bcm63xx_hsspi_transfer_one(struct spi_master *master, spi_transfer_delay_exec(t); - if (t->cs_change) - bcm63xx_hsspi_set_cs(bs, spi->chip_select, false); + /* use existing cs change logic from spi_transfer_one_message */ + if (t->cs_change) { + if (list_is_last(&t->transfer_list, &msg->transfers)) { + keep_cs = true; + } else { + if (!t->cs_off) + bcm63xx_hsspi_set_cs(bs, spi->chip_select, false); + + spi_transfer_cs_change_delay_exec(msg, t); + + if (!list_next_entry(t, transfer_list)->cs_off) + bcm63xx_hsspi_set_cs(bs, spi->chip_select, true); + } + } else if (!list_is_last(&t->transfer_list, &msg->transfers) && + t->cs_off != list_next_entry(t, transfer_list)->cs_off) { + bcm63xx_hsspi_set_cs(bs, spi->chip_select, t->cs_off); + } } - mutex_lock(&bs->bus_mutex); - reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG); - reg &= ~GLOBAL_CTRL_CS_POLARITY_MASK; - reg |= bs->cs_polarity; - __raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG); - mutex_unlock(&bs->bus_mutex); + bcm63xx_hsspi_set_cs(bs, dummy_cs, false); + if (status || !keep_cs) + bcm63xx_hsspi_set_cs(bs, spi->chip_select, false); mutex_unlock(&bs->msg_mutex); msg->status = status; |