diff mbox series

[16/22] spi: sh-msiof: Correct RX FIFO size for R-Car Gen3

Message ID 25d41fd2e9295b74d09f3fab7722214109b38908.1746180072.git.geert+renesas@glider.be
State New
Headers show
Series spi: sh-msiof: Transfer size improvements and I2S reuse | expand

Commit Message

Geert Uytterhoeven May 2, 2025, 10:13 a.m. UTC 
According to the R-Car Gen3 Hardware Manual Errata for Rev 0.55 of
September 28, 2017, the MSIOF receive FIFOs on R-Car Gen3 SoCs have room
for 256 words of 32 bits.

Note that this change has no actual impact on the behavior of the
driver, as SPI_CONTROLLER_MUST_TX is set, and transfer size is currenty
limited to the minimum of the transmit and receive FIFO sizes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/spi/spi-sh-msiof.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 8d18a26128d600f6..8afb7c1f64cd4486 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -1108,7 +1108,7 @@  static const struct sh_msiof_chipdata rcar_gen3_data = {
 	.bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) |
 			      SPI_BPW_MASK(24) | SPI_BPW_MASK(32),
 	.tx_fifo_size = 64,
-	.rx_fifo_size = 64,
+	.rx_fifo_size = 256,
 	.ctlr_flags = SPI_CONTROLLER_MUST_TX,
 	.min_div_pow = 1,
 };
@@ -1117,7 +1117,7 @@  static const struct sh_msiof_chipdata rcar_r8a7795_data = {
 	.bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16) |
 			      SPI_BPW_MASK(24) | SPI_BPW_MASK(32),
 	.tx_fifo_size = 64,
-	.rx_fifo_size = 64,
+	.rx_fifo_size = 256,
 	.ctlr_flags = SPI_CONTROLLER_MUST_TX,
 	.min_div_pow = 1,
 	.flags = SH_MSIOF_FLAG_FIXED_DTDL_200,