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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2020-10-08 02:55:07 +0300
committerMark Brown <broonie@kernel.org>2020-10-09 01:00:20 +0300
commit84ecaf4a7837e8c0957a59d77fd7e8e4926968cb (patch)
treeed78ba24895c4dff440107243b11f1556d4b0305 /drivers/spi
parent6423207e57ea53826eaae1a14c14fd6d22561b06 (diff)
downloadlinux-84ecaf4a7837e8c0957a59d77fd7e8e4926968cb.tar.xz
spi: dw: Introduce max mem-ops SPI bus frequency setting
In some circumstances the current implementation of the SPI memory operations may occasionally fail even though they are executed in the atomic context. This may happen if the system bus is relatively slow in comparison to the SPI bus frequency, or there is a concurrent access to it, which makes the MMIO-operations occasionally stalling before push-pulling data from the DW APB SPI FIFOs. These two problems we've discovered on the Baikal-T1 SoC. In order to fix them we have no choice but to set an artificial limitation on the SPI bus speed. Note currently this limitation will be only applicable for the memory operations, since the standard SPI core interface is implemented with an assumption that there is no problem with the automatic CS toggling. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Link: https://lore.kernel.org/r/20201007235511.4935-19-Sergey.Semin@baikalelectronics.ru Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-dw-core.c4
-rw-r--r--drivers/spi/spi-dw.h1
2 files changed, 4 insertions, 1 deletions
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c
index 8eb3b31b376d..bcfa224e0e43 100644
--- a/drivers/spi/spi-dw-core.c
+++ b/drivers/spi/spi-dw-core.c
@@ -629,7 +629,7 @@ static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op)
* operation. Transmit-only mode is suitable for the rest of them.
*/
cfg.dfs = 8;
- cfg.freq = mem->spi->max_speed_hz;
+ cfg.freq = clamp(mem->spi->max_speed_hz, 0U, dws->max_mem_freq);
if (op->data.dir == SPI_MEM_DATA_IN) {
cfg.tmode = SPI_TMOD_EPROMREAD;
cfg.ndf = op->data.nbytes;
@@ -717,6 +717,8 @@ static void dw_spi_init_mem_ops(struct dw_spi *dws)
dws->mem_ops.adjust_op_size = dw_spi_adjust_mem_op_size;
dws->mem_ops.supports_op = dw_spi_supports_mem_op;
dws->mem_ops.exec_op = dw_spi_exec_mem_op;
+ if (!dws->max_mem_freq)
+ dws->max_mem_freq = dws->max_freq;
}
}
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
index 7fadb5b963f8..faf40cb66498 100644
--- a/drivers/spi/spi-dw.h
+++ b/drivers/spi/spi-dw.h
@@ -148,6 +148,7 @@ struct dw_spi {
unsigned long paddr;
int irq;
u32 fifo_len; /* depth of the FIFO buffer */
+ u32 max_mem_freq; /* max mem-ops bus freq */
u32 max_freq; /* max bus freq supported */
u32 caps; /* DW SPI capabilities */