linux-kernel - [PATCH 1/7] spi: cadence: Fix busy cycles calculation

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Date:   Mon, 19 Dec 2022 06:42:48 -0800
From:   Witold Sadowski <wsadowski@...vell.com>
To:     <broonie@...nel.org>
CC:     <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <jpawar@...ence.com>,
        <pthombar@...ence.com>, <konrad@...ence.com>,
        <wbartczak@...vell.com>, <wzmuda@...vell.com>,
        <wsadowski@...vell.com>
Subject: [PATCH 1/7] spi: cadence: Fix busy cycles calculation

If xSPI is in x2/x4/x8 mode to calculate busy
cycles, busy bits count must be divided by the number
of lanes.
If opcommand is using 8 busy bits, but SPI is
in x4 mode, there will be only 2 busy cycles.

Signed-off-by: Witold Sadowski <wsadowski@...vell.com>
Reviewed-by: Chandrakala Chavva <cchavva@...vell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@...vell.com>
---
 drivers/spi/spi-cadence-xspi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
index 520b4cc69cdc..91db3c973167 100644
--- a/drivers/spi/spi-cadence-xspi.c
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -177,7 +177,10 @@
 #define CDNS_XSPI_CMD_FLD_DSEQ_CMD_3(op) ( \
 	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_DCNT_H, \
 		((op)->data.nbytes >> 16) & 0xffff) | \
-	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_NUM_OF_DUMMY, (op)->dummy.nbytes * 8))
+	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R3_NUM_OF_DUMMY, \
+		  (op)->dummy.buswidth != 0 ? \
+		  (((op)->dummy.nbytes * 8) / (op)->dummy.buswidth) : \
+		  0))
 
 #define CDNS_XSPI_CMD_FLD_DSEQ_CMD_4(op, chipsel) ( \
 	FIELD_PREP(CDNS_XSPI_CMD_DSEQ_R4_BANK, chipsel) | \
-- 
2.17.1