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-rw-r--r--drivers/spi/spi-qcom-qspi.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c
index db1dd133762e..1954c39b3d08 100644
--- a/drivers/spi/spi-qcom-qspi.c
+++ b/drivers/spi/spi-qcom-qspi.c
@@ -666,6 +666,30 @@ static irqreturn_t qcom_qspi_irq(int irq, void *dev_id)
return ret;
}
+static int qcom_qspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
+{
+ /*
+ * If qcom_qspi_can_dma() is going to return false we don't need to
+ * adjust anything.
+ */
+ if (op->data.nbytes <= QSPI_MAX_BYTES_FIFO)
+ return 0;
+
+ /*
+ * When reading, the transfer needs to be a multiple of 4 bytes so
+ * shrink the transfer if that's not true. The caller will then do a
+ * second transfer to finish things up.
+ */
+ if (op->data.dir == SPI_MEM_DATA_IN && (op->data.nbytes & 0x3))
+ op->data.nbytes &= ~0x3;
+
+ return 0;
+}
+
+static const struct spi_controller_mem_ops qcom_qspi_mem_ops = {
+ .adjust_op_size = qcom_qspi_adjust_op_size,
+};
+
static int qcom_qspi_probe(struct platform_device *pdev)
{
int ret;
@@ -750,6 +774,7 @@ static int qcom_qspi_probe(struct platform_device *pdev)
if (of_property_read_bool(pdev->dev.of_node, "iommus"))
master->can_dma = qcom_qspi_can_dma;
master->auto_runtime_pm = true;
+ master->mem_ops = &qcom_qspi_mem_ops;
ret = devm_pm_opp_set_clkname(&pdev->dev, "core");
if (ret)