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dmaengine: Extend NXP QDMA driver to check transmission errors

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Extend NXP QDMA driver to check transmission errors

The NXP QDMA driver (fsl-qdma.c) does not check the status bits
that indicate if a DMA transfer has been completed successfully.
This patch extends the driver to do exactly this.

Signed-off-by: Mathias Koehrer <mathias.koehrer@etas.com>
Link: https://lore.kernel.org/r/744443c0462aac2df4754f99500a911527c0b235.camel@bosch.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Koehrer Mathias (ETAS/EES-SL) 2020-07-15 08:41:19 +00:00 committed by Vinod Koul
parent c3846c4cce
commit ab6041e409
1 changed files with 57 additions and 6 deletions
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63
drivers/dma/fsl-qdma.c
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@ -56,7 +56,7 @@
/* Registers for bit and genmask */
#define FSL_QDMA_CQIDR_SQT BIT(15)
#define QDMA_CCDF_FOTMAT BIT(29)
#define QDMA_CCDF_FORMAT BIT(29)
#define QDMA_CCDF_SER BIT(30)
#define QDMA_SG_FIN BIT(30)
#define QDMA_SG_LEN_MASK GENMASK(29, 0)
@ -110,8 +110,19 @@
#define FSL_QDMA_CMD_DSEN_OFFSET 19
#define FSL_QDMA_CMD_LWC_OFFSET 16
/* Field definition for Descriptor status */
#define QDMA_CCDF_STATUS_RTE BIT(5)
#define QDMA_CCDF_STATUS_WTE BIT(4)
#define QDMA_CCDF_STATUS_CDE BIT(2)
#define QDMA_CCDF_STATUS_SDE BIT(1)
#define QDMA_CCDF_STATUS_DDE BIT(0)
#define QDMA_CCDF_STATUS_MASK (QDMA_CCDF_STATUS_RTE | \
QDMA_CCDF_STATUS_WTE | \
QDMA_CCDF_STATUS_CDE | \
QDMA_CCDF_STATUS_SDE | \
QDMA_CCDF_STATUS_DDE)
/* Field definition for Descriptor offset */
#define QDMA_CCDF_STATUS 20
#define QDMA_CCDF_OFFSET 20
#define QDMA_SDDF_CMD(x) (((u64)(x)) << 32)
@ -243,13 +254,14 @@ qdma_ccdf_get_offset(const struct fsl_qdma_format *ccdf)
static inline void
qdma_ccdf_set_format(struct fsl_qdma_format *ccdf, int offset)
{
ccdf->cfg = cpu_to_le32(QDMA_CCDF_FOTMAT | offset);
ccdf->cfg = cpu_to_le32(QDMA_CCDF_FORMAT |
(offset << QDMA_CCDF_OFFSET));
}
static inline int
qdma_ccdf_get_status(const struct fsl_qdma_format *ccdf)
{
return (le32_to_cpu(ccdf->status) & QDMA_CCDF_MASK) >> QDMA_CCDF_STATUS;
return (le32_to_cpu(ccdf->status) & QDMA_CCDF_STATUS_MASK);
}
static inline void
@ -618,6 +630,7 @@ fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
{
bool duplicate;
u32 reg, i, count;
u8 completion_status;
struct fsl_qdma_queue *temp_queue;
struct fsl_qdma_format *status_addr;
struct fsl_qdma_comp *fsl_comp = NULL;
@ -677,6 +690,8 @@ fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
}
list_del(&fsl_comp->list);
completion_status = qdma_ccdf_get_status(status_addr);
reg = qdma_readl(fsl_qdma, block + FSL_QDMA_BSQMR);
reg |= FSL_QDMA_BSQMR_DI;
qdma_desc_addr_set64(status_addr, 0x0);
@ -686,6 +701,31 @@ fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma,
qdma_writel(fsl_qdma, reg, block + FSL_QDMA_BSQMR);
spin_unlock(&temp_queue->queue_lock);
/* The completion_status is evaluated here
* (outside of spin lock)
*/
if (completion_status) {
/* A completion error occurred! */
if (completion_status & QDMA_CCDF_STATUS_WTE) {
/* Write transaction error */
fsl_comp->vdesc.tx_result.result =
DMA_TRANS_WRITE_FAILED;
} else if (completion_status & QDMA_CCDF_STATUS_RTE) {
/* Read transaction error */
fsl_comp->vdesc.tx_result.result =
DMA_TRANS_READ_FAILED;
} else {
/* Command/source/destination
* description error
*/
fsl_comp->vdesc.tx_result.result =
DMA_TRANS_ABORTED;
dev_err(fsl_qdma->dma_dev.dev,
"DMA status descriptor error %x\n",
completion_status);
}
}
spin_lock(&fsl_comp->qchan->vchan.lock);
vchan_cookie_complete(&fsl_comp->vdesc);
fsl_comp->qchan->status = DMA_COMPLETE;
@ -700,11 +740,22 @@ static irqreturn_t fsl_qdma_error_handler(int irq, void *dev_id)
unsigned int intr;
struct fsl_qdma_engine *fsl_qdma = dev_id;
void __iomem *status = fsl_qdma->status_base;
unsigned int decfdw0r;
unsigned int decfdw1r;
unsigned int decfdw2r;
unsigned int decfdw3r;
intr = qdma_readl(fsl_qdma, status + FSL_QDMA_DEDR);
if (intr)
dev_err(fsl_qdma->dma_dev.dev, "DMA transaction error!\n");
if (intr) {
decfdw0r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW0R);
decfdw1r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW1R);
decfdw2r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW2R);
decfdw3r = qdma_readl(fsl_qdma, status + FSL_QDMA_DECFDW3R);
dev_err(fsl_qdma->dma_dev.dev,
"DMA transaction error! (%x: %x-%x-%x-%x)\n",
intr, decfdw0r, decfdw1r, decfdw2r, decfdw3r);
}
qdma_writel(fsl_qdma, FSL_QDMA_DEDR_CLEAR, status + FSL_QDMA_DEDR);
return IRQ_HANDLED;