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Diffstat (limited to 'drivers/spi/spi.c')
-rw-r--r--drivers/spi/spi.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 19ee901577d..f996c600eb8 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -33,7 +33,7 @@
#include <linux/of_gpio.h>
#include <linux/pm_runtime.h>
#include <linux/export.h>
-#include <linux/sched.h>
+#include <linux/sched/rt.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/ioport.h>
@@ -1059,15 +1059,14 @@ EXPORT_SYMBOL_GPL(spi_alloc_master);
#ifdef CONFIG_OF
static int of_spi_register_master(struct spi_master *master)
{
- u16 nb;
- int i, *cs;
+ int nb, i, *cs;
struct device_node *np = master->dev.of_node;
if (!np)
return 0;
nb = of_gpio_named_count(np, "cs-gpios");
- master->num_chipselect = max(nb, master->num_chipselect);
+ master->num_chipselect = max(nb, (int)master->num_chipselect);
if (nb < 1)
return 0;
@@ -1080,7 +1079,8 @@ static int of_spi_register_master(struct spi_master *master)
if (!master->cs_gpios)
return -ENOMEM;
- memset(cs, -EINVAL, master->num_chipselect);
+ for (i = 0; i < master->num_chipselect; i++)
+ cs[i] = -EINVAL;
for (i = 0; i < nb; i++)
cs[i] = of_get_named_gpio(np, "cs-gpios", i);
@@ -1135,6 +1135,9 @@ int spi_register_master(struct spi_master *master)
if (master->num_chipselect == 0)
return -EINVAL;
+ if ((master->bus_num < 0) && master->dev.of_node)
+ master->bus_num = of_alias_get_id(master->dev.of_node, "spi");
+
/* convention: dynamically assigned bus IDs count down from the max */
if (master->bus_num < 0) {
/* FIXME switch to an IDR based scheme, something like
@@ -1248,10 +1251,10 @@ int spi_master_resume(struct spi_master *master)
}
EXPORT_SYMBOL_GPL(spi_master_resume);
-static int __spi_master_match(struct device *dev, void *data)
+static int __spi_master_match(struct device *dev, const void *data)
{
struct spi_master *m;
- u16 *bus_num = data;
+ const u16 *bus_num = data;
m = container_of(dev, struct spi_master, dev);
return m->bus_num == *bus_num;
@@ -1366,12 +1369,14 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
}
/**
- * Set transfer bits_per_word as spi device default if it is not
- * set for this transfer.
+ * Set transfer bits_per_word and max speed as spi device default if
+ * it is not set for this transfer.
*/
list_for_each_entry(xfer, &message->transfers, transfer_list) {
if (!xfer->bits_per_word)
xfer->bits_per_word = spi->bits_per_word;
+ if (!xfer->speed_hz)
+ xfer->speed_hz = spi->max_speed_hz;
}
message->spi = spi;
@@ -1656,7 +1661,8 @@ int spi_write_then_read(struct spi_device *spi,
* using the pre-allocated buffer or the transfer is too large.
*/
if ((n_tx + n_rx) > SPI_BUFSIZ || !mutex_trylock(&lock)) {
- local_buf = kmalloc(max((unsigned)SPI_BUFSIZ, n_tx + n_rx), GFP_KERNEL);
+ local_buf = kmalloc(max((unsigned)SPI_BUFSIZ, n_tx + n_rx),
+ GFP_KERNEL | GFP_DMA);
if (!local_buf)
return -ENOMEM;
} else {