[PATCH] spi: sh-msiof: abort transfers when reset times out

[Pengpeng Hou]

sh_msiof_spi_reset_regs() asserts TX/RX reset and polls until the reset
bits clear, but the poll result is ignored. sh_msiof_transfer_one() can
therefore continue programming a transfer after the controller did not
leave reset.

Return the reset poll result from the helper and abort the transfer on
timeout, matching the existing transfer path's error-return style.

Fixes: fedd6940682a ("spi: sh-msiof: Add reset of registers before starting transfer")
Signed-off-by: Pengpeng Hou <pengpeng@xxxxxxxxxxx>
---
 drivers/spi/spi-sh-msiof.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index f23db85a1..1aeab7ec0 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -114,7 +114,7 @@ static irqreturn_t sh_msiof_spi_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static void sh_msiof_spi_reset_regs(struct sh_msiof_spi_priv *p)
+static int sh_msiof_spi_reset_regs(struct sh_msiof_spi_priv *p)
 {
 	u32 mask = SICTR_TXRST | SICTR_RXRST;
 	u32 data;
@@ -123,8 +123,8 @@ static void sh_msiof_spi_reset_regs(struct sh_msiof_spi_priv *p)
 	data |= mask;
 	sh_msiof_write(p, SICTR, data);
 
-	readl_poll_timeout_atomic(p->mapbase + SICTR, data, !(data & mask), 1,
-				  100);
+	return readl_poll_timeout_atomic(p->mapbase + SICTR, data,
+					 !(data & mask), 1, 100);
 }
 
 static void sh_msiof_spi_set_clk_regs(struct sh_msiof_spi_priv *p,
@@ -834,7 +834,9 @@ static int sh_msiof_transfer_one(struct spi_controller *ctlr,
 	int ret;
 
 	/* reset registers */
-	sh_msiof_spi_reset_regs(p);
+	ret = sh_msiof_spi_reset_regs(p);
+	if (ret)
+		return ret;
 
 	/* setup clocks (clock already enabled in chipselect()) */
 	if (!spi_controller_is_target(p->ctlr))
-- 
2.50.1 (Apple Git-155)