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spi: Fixes for v6.5

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A bunch of fixes for the Qualcomm QSPI driver, fixing multiple issues
 with the newly added DMA mode - it had a number of issues exposed when
 tested in a wider range of use cases, both race condition style issues
 and issues with different inputs to those that had been used in test.
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Merge tag 'spi-fix-v6.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "A bunch of fixes for the Qualcomm QSPI driver, fixing multiple issues
  with the newly added DMA mode - it had a number of issues exposed when
  tested in a wider range of use cases, both race condition style issues
  and issues with different inputs to those that had been used in test"

* tag 'spi-fix-v6.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: spi-qcom-qspi: Add mem_ops to avoid PIO for badly sized reads
  spi: spi-qcom-qspi: Fallback to PIO for xfers that aren't multiples of 4 bytes
  spi: spi-qcom-qspi: Add DMA_CHAIN_DONE to ALL_IRQS
  spi: spi-qcom-qspi: Call dma_wmb() after setting up descriptors
  spi: spi-qcom-qspi: Use GFP_ATOMIC flag while allocating for descriptor
  spi: spi-qcom-qspi: Ignore disabled interrupts' status in isr
This commit is contained in:
Linus Torvalds 2023-07-30 12:54:31 -07:00
commit d5bb4b89ac
1 changed files with 49 additions and 5 deletions
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54
drivers/spi/spi-qcom-qspi.c
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@ -69,7 +69,7 @@
WR_FIFO_OVERRUN)
#define QSPI_ALL_IRQS (QSPI_ERR_IRQS | RESP_FIFO_RDY | \
WR_FIFO_EMPTY | WR_FIFO_FULL | \
TRANSACTION_DONE)
TRANSACTION_DONE | DMA_CHAIN_DONE)
#define PIO_XFER_CTRL 0x0014
#define REQUEST_COUNT_MSK 0xffff
@ -308,9 +308,11 @@ static int qcom_qspi_alloc_desc(struct qcom_qspi *ctrl, dma_addr_t dma_ptr,
dma_addr_t dma_cmd_desc;
/* allocate for dma cmd descriptor */
virt_cmd_desc = dma_pool_alloc(ctrl->dma_cmd_pool, GFP_KERNEL | __GFP_ZERO, &dma_cmd_desc);
if (!virt_cmd_desc)
return -ENOMEM;
virt_cmd_desc = dma_pool_alloc(ctrl->dma_cmd_pool, GFP_ATOMIC | __GFP_ZERO, &dma_cmd_desc);
if (!virt_cmd_desc) {
dev_warn_once(ctrl->dev, "Couldn't find memory for descriptor\n");
return -EAGAIN;
}
ctrl->virt_cmd_desc[ctrl->n_cmd_desc] = virt_cmd_desc;
ctrl->dma_cmd_desc[ctrl->n_cmd_desc] = dma_cmd_desc;
@ -355,10 +357,22 @@ static int qcom_qspi_setup_dma_desc(struct qcom_qspi *ctrl,
for (i = 0; i < sgt->nents; i++) {
dma_ptr_sg = sg_dma_address(sgt->sgl + i);
dma_len_sg = sg_dma_len(sgt->sgl + i);
if (!IS_ALIGNED(dma_ptr_sg, QSPI_ALIGN_REQ)) {
dev_warn_once(ctrl->dev, "dma_address not aligned to %d\n", QSPI_ALIGN_REQ);
return -EAGAIN;
}
/*
* When reading with DMA the controller writes to memory 1 word
* at a time. If the length isn't a multiple of 4 bytes then
* the controller can clobber the things later in memory.
* Fallback to PIO to be safe.
*/
if (ctrl->xfer.dir == QSPI_READ && (dma_len_sg & 0x03)) {
dev_warn_once(ctrl->dev, "fallback to PIO for read of size %#010x\n",
dma_len_sg);
return -EAGAIN;
}
}
for (i = 0; i < sgt->nents; i++) {
@ -441,8 +455,10 @@ static int qcom_qspi_transfer_one(struct spi_master *master,
ret = qcom_qspi_setup_dma_desc(ctrl, xfer);
if (ret != -EAGAIN) {
if (!ret)
if (!ret) {
dma_wmb();
qcom_qspi_dma_xfer(ctrl);
}
goto exit;
}
dev_warn_once(ctrl->dev, "DMA failure, falling back to PIO\n");
@ -603,6 +619,9 @@ static irqreturn_t qcom_qspi_irq(int irq, void *dev_id)
int_status = readl(ctrl->base + MSTR_INT_STATUS);
writel(int_status, ctrl->base + MSTR_INT_STATUS);
/* Ignore disabled interrupts */
int_status &= readl(ctrl->base + MSTR_INT_EN);
/* PIO mode handling */
if (ctrl->xfer.dir == QSPI_WRITE) {
if (int_status & WR_FIFO_EMPTY)
@ -647,6 +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;
@ -731,6 +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)