[PATCH 2/4] spi: zynq_qspi: Use dummy buswidth in dummy byte calculation
Ashok Reddy Soma
ashok.reddy.soma at xilinx.com
Fri Jul 15 16:01:17 CEST 2022
From: T Karthik Reddy <t.karthik.reddy at xilinx.com>
Fix dummy bytes calculation incase of valid dummy bytes when dummy
buswidth is > 1. Current dummy bytes calculation does not provide
correct dummy values for dummy buswidth > 1.
Signed-off-by: T Karthik Reddy <t.karthik.reddy at xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma at xilinx.com>
---
drivers/spi/zynq_qspi.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/zynq_qspi.c b/drivers/spi/zynq_qspi.c
index 066a0c6002..b138c3c38a 100644
--- a/drivers/spi/zynq_qspi.c
+++ b/drivers/spi/zynq_qspi.c
@@ -679,6 +679,7 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
int op_len, pos = 0, ret, i;
+ u32 dummy_bytes = 0;
unsigned int flag = 0;
const u8 *tx_buf = NULL;
u8 *rx_buf = NULL;
@@ -691,6 +692,11 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
}
op_len = op->cmd.nbytes + op->addr.nbytes + op->dummy.nbytes;
+ if (op->dummy.nbytes) {
+ op_len = op->cmd.nbytes + op->addr.nbytes +
+ op->dummy.nbytes / op->dummy.buswidth;
+ dummy_bytes = op->dummy.nbytes / op->dummy.buswidth;
+ }
u8 op_buf[op_len];
@@ -704,8 +710,8 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
pos += op->addr.nbytes;
}
- if (op->dummy.nbytes)
- memset(op_buf + pos, 0xff, op->dummy.nbytes);
+ if (dummy_bytes)
+ memset(op_buf + pos, 0xff, dummy_bytes);
/* 1st transfer: opcode + address + dummy cycles */
/* Make sure to set END bit if no tx or rx data messages follow */
--
2.17.1
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