AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-30 07:56:45 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

spi: atmel: Fix scheduling while atomic

Browse Source 
A call to clk_get_rate appears to be called in the context of an interrupt,
cache the bus clock for the frequency calculations in transmission.

This fixes a 'BUG: scheduling while atomic' and
'WARNING: CPU: 0 PID: 777 at kernel/sched/core.c:2960 atmel_spi_unlock'

Signed-off-by: Ben Whitten <ben.whitten@lairdtech.com>
Signed-off-by: Steve deRosier <steve.derosier@lairdtech.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Ben Whitten 2016-11-14 15:13:20 +00:00 committed by Mark Brown
parent 9610620078
commit 39fe33f98b
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/spi/spi-atmel.c
View File

@ -296,6 +296,7 @@ struct atmel_spi {
int irq;
struct clk *clk;
struct platform_device *pdev;
unsigned long spi_clk;
struct spi_transfer *current_transfer;
int current_remaining_bytes;
@ -865,7 +866,7 @@ static int atmel_spi_set_xfer_speed(struct atmel_spi *as,
unsigned long bus_hz;
/* v1 chips start out at half the peripheral bus speed. */
bus_hz = clk_get_rate(as->clk);
bus_hz = as->spi_clk;
if (!atmel_spi_is_v2(as))
bus_hz /= 2;
@ -1634,6 +1635,9 @@ static int atmel_spi_probe(struct platform_device *pdev)
ret = clk_prepare_enable(clk);
if (ret)
goto out_free_irq;
as->spi_clk = clk_get_rate(clk);
spi_writel(as, CR, SPI_BIT(SWRST));
spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
if (as->caps.has_wdrbt) {