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spi: zynq_qspi: Use dummy buswidth in dummy byte calculation

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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@xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/1657893679-20039-3-git-send-email-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
This commit is contained in:
T Karthik Reddy 2022-07-15 19:31:17 +05:30 committed by Michal Simek
parent 1acb70393f
commit e097847286
1 changed files with 8 additions and 2 deletions
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10
drivers/spi/zynq_qspi.c
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@ -679,6 +679,7 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
const struct spi_mem_op *op) const struct spi_mem_op *op)
{ {
int op_len, pos = 0, ret, i; int op_len, pos = 0, ret, i;
u32 dummy_bytes = 0;
unsigned int flag = 0; unsigned int flag = 0;
const u8 *tx_buf = NULL; const u8 *tx_buf = NULL;
u8 *rx_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; 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]; u8 op_buf[op_len];
@ -704,8 +710,8 @@ static int zynq_qspi_exec_op(struct spi_slave *slave,
pos += op->addr.nbytes; pos += op->addr.nbytes;
} }
if (op->dummy.nbytes) if (dummy_bytes)
memset(op_buf + pos, 0xff, op->dummy.nbytes); memset(op_buf + pos, 0xff, dummy_bytes);
/* 1st transfer: opcode + address + dummy cycles */ /* 1st transfer: opcode + address + dummy cycles */
/* Make sure to set END bit if no tx or rx data messages follow */ /* Make sure to set END bit if no tx or rx data messages follow */