From: Michael Hennerich michael.hennerich@analog.com
commit 4d163ad79b155c71bf30366dc38f8d2502f78844 upstream.
The issue is that using SPI from a callback under the CCF lock will deadlock, since this code uses clk_get_rate().
Fixes: c474b38665463 ("spi: Add driver for Cadence SPI controller") Signed-off-by: Michael Hennerich michael.hennerich@analog.com Signed-off-by: Alexandru Ardelean alexandru.ardelean@analog.com Link: https://lore.kernel.org/r/20210114154217.51996-1-alexandru.ardelean@analog.c... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/spi/spi-cadence.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/spi/spi-cadence.c +++ b/drivers/spi/spi-cadence.c @@ -116,6 +116,7 @@ struct cdns_spi { void __iomem *regs; struct clk *ref_clk; struct clk *pclk; + unsigned int clk_rate; u32 speed_hz; const u8 *txbuf; u8 *rxbuf; @@ -257,7 +258,7 @@ static void cdns_spi_config_clock_freq(s u32 ctrl_reg, baud_rate_val; unsigned long frequency;
- frequency = clk_get_rate(xspi->ref_clk); + frequency = xspi->clk_rate;
ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
@@ -557,8 +558,9 @@ static int cdns_spi_probe(struct platfor master->set_cs = cdns_spi_chipselect; master->mode_bits = SPI_CPOL | SPI_CPHA;
+ xspi->clk_rate = clk_get_rate(xspi->ref_clk); /* Set to default valid value */ - master->max_speed_hz = clk_get_rate(xspi->ref_clk) / 4; + master->max_speed_hz = xspi->clk_rate / 4; xspi->speed_hz = master->max_speed_hz;
master->bits_per_word_mask = SPI_BPW_MASK(8);