Thread (21 messages) 21 messages, 2 authors, 2020-05-24

Re: [PATCH v8 02/19] spi: spi-mem: allow specifying a command's extension

From: Boris Brezillon <boris.brezillon@collabora.com>
Date: 2020-05-24 20:18:06
Also in: linux-mediatek, linux-spi, lkml

On Sat, 23 May 2020 04:10:25 +0530
Pratyush Yadav [off-list ref] wrote:
quoted hunk ↗ jump to hunk
diff --git a/drivers/spi/spi-mxic.c b/drivers/spi/spi-mxic.c
index 69491f3a515d..4e4292f0ee1d 100644
--- a/drivers/spi/spi-mxic.c
+++ b/drivers/spi/spi-mxic.c
@@ -356,6 +356,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem,
 	int nio = 1, i, ret;
 	u32 ss_ctrl;
 	u8 addr[8];
+	u8 opcode = op->cmd.opcode & 0xff;
You don't need the '& 0xff' here, the cast to an u8 will truncate the
value anyway.
quoted hunk ↗ jump to hunk
 
 	ret = mxic_spi_set_freq(mxic, mem->spi->max_speed_hz);
 	if (ret)
@@ -393,7 +394,7 @@ static int mxic_spi_mem_exec_op(struct spi_mem *mem,
 	writel(readl(mxic->regs + HC_CFG) | HC_CFG_MAN_CS_ASSERT,
 	       mxic->regs + HC_CFG);
 
-	ret = mxic_spi_data_xfer(mxic, &op->cmd.opcode, NULL, 1);
+	ret = mxic_spi_data_xfer(mxic, &opcode, NULL, 1);
 	if (ret)
 		goto out;
 
diff --git a/drivers/spi/spi-zynq-qspi.c b/drivers/spi/spi-zynq-qspi.c
index 17641157354d..41389856e14a 100644
--- a/drivers/spi/spi-zynq-qspi.c
+++ b/drivers/spi/spi-zynq-qspi.c
@@ -527,20 +527,21 @@ static int zynq_qspi_exec_mem_op(struct spi_mem *mem,
 	struct zynq_qspi *xqspi = spi_controller_get_devdata(mem->spi->master);
 	int err = 0, i;
 	u8 *tmpbuf;
+	u8 opcode = op->cmd.opcode & 0xff;
 
Ditto.
 	dev_dbg(xqspi->dev, "cmd:%#x mode:%d.%d.%d.%d\n",
-		op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
+		opcode, op->cmd.buswidth, op->addr.buswidth,
 		op->dummy.buswidth, op->data.buswidth);
 
 	zynq_qspi_chipselect(mem->spi, true);
 	zynq_qspi_config_op(xqspi, mem->spi);
 
-	if (op->cmd.opcode) {
+	if (opcode) {
Unrelated to this patch, but this test is wrong. I don't see why we
couldn't have a '0' opcode. The test should be dropped or done on the
new op->cmd.nbytes field.
 		reinit_completion(&xqspi->data_completion);
-		xqspi->txbuf = (u8 *)&op->cmd.opcode;
+		xqspi->txbuf = &opcode;
 		xqspi->rxbuf = NULL;
-		xqspi->tx_bytes = sizeof(op->cmd.opcode);
-		xqspi->rx_bytes = sizeof(op->cmd.opcode);
+		xqspi->tx_bytes = op->cmd.nbytes;
+		xqspi->rx_bytes = op->cmd.nbytes;
 		zynq_qspi_write_op(xqspi, ZYNQ_QSPI_FIFO_DEPTH, true);
 		zynq_qspi_write(xqspi, ZYNQ_QSPI_IEN_OFFSET,
 				ZYNQ_QSPI_IXR_RXTX_MASK);
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