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authorLaxman Dewangan <ldewangan@nvidia.com>2013-03-08 10:21:19 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-03-12 23:07:52 +0400
commitd558c4733759e077cf449246983a5d1fe97fc434 (patch)
treec3a262f68e90f83bf17e9f467f1fadd6b64b9dee /drivers
parentf6161aa153581da4a3867a2d1a7caf4be19b6ec9 (diff)
downloadlinux-d558c4733759e077cf449246983a5d1fe97fc434.tar.xz
spi: slink-tegra20: move runtime pm calls to transfer_one_message
The prepare_transfer_hardware() is called in atomic context and calling synchronous runtime pm calls can create scheduling deadlock. Therefore, in place of calling runtime PM calls from prepare/unprepare message transfer, calling this in transfer_one_message(). Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/spi/spi-tegra20-slink.c25
1 files changed, 8 insertions, 17 deletions
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index b8698b389ef3..a829563f4713 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -858,21 +858,6 @@ static int tegra_slink_setup(struct spi_device *spi)
return 0;
}
-static int tegra_slink_prepare_transfer(struct spi_master *master)
-{
- struct tegra_slink_data *tspi = spi_master_get_devdata(master);
-
- return pm_runtime_get_sync(tspi->dev);
-}
-
-static int tegra_slink_unprepare_transfer(struct spi_master *master)
-{
- struct tegra_slink_data *tspi = spi_master_get_devdata(master);
-
- pm_runtime_put(tspi->dev);
- return 0;
-}
-
static int tegra_slink_transfer_one_message(struct spi_master *master,
struct spi_message *msg)
{
@@ -885,6 +870,12 @@ static int tegra_slink_transfer_one_message(struct spi_master *master,
msg->status = 0;
msg->actual_length = 0;
+ ret = pm_runtime_get_sync(tspi->dev);
+ if (ret < 0) {
+ dev_err(tspi->dev, "runtime get failed: %d\n", ret);
+ goto done;
+ }
+
single_xfer = list_is_singular(&msg->transfers);
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
INIT_COMPLETION(tspi->xfer_completion);
@@ -921,6 +912,8 @@ static int tegra_slink_transfer_one_message(struct spi_master *master,
exit:
tegra_slink_writel(tspi, tspi->def_command_reg, SLINK_COMMAND);
tegra_slink_writel(tspi, tspi->def_command2_reg, SLINK_COMMAND2);
+ pm_runtime_put(tspi->dev);
+done:
msg->status = ret;
spi_finalize_current_message(master);
return ret;
@@ -1148,9 +1141,7 @@ static int tegra_slink_probe(struct platform_device *pdev)
/* the spi->mode bits understood by this driver: */
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->setup = tegra_slink_setup;
- master->prepare_transfer_hardware = tegra_slink_prepare_transfer;
master->transfer_one_message = tegra_slink_transfer_one_message;
- master->unprepare_transfer_hardware = tegra_slink_unprepare_transfer;
master->num_chipselect = MAX_CHIP_SELECT;
master->bus_num = -1;