Messages in this thread Patch in this message | | | From | Peter Ujfalusi <> | Subject | [PATCH v3 21/24] dmaengine: edma: Simplify and optimize ccerr interrupt handler | Date | Tue, 22 Sep 2015 12:54:32 +0300 |
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No need to run through the bits in QEMR and CCERR events since they will not trigger any action, so just clearing the errors there is fine. In case of the missed event the loop can be optimized so we spend less time to handle the event.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> --- drivers/dma/edma.c | 64 ++++++++++++++++++++---------------------------------- 1 file changed, 23 insertions(+), 41 deletions(-)
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 30e3c54d86e3..c8350248c0c6 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -1625,6 +1625,7 @@ static irqreturn_t dma_ccerr_handler(int irq, void *data) int i; int ctlr; unsigned int cnt = 0; + unsigned int val; ctlr = ecc->id; if (ctlr < 0) @@ -1637,54 +1638,35 @@ static irqreturn_t dma_ccerr_handler(int irq, void *data) while (1) { int j = -1; - if (edma_read_array(ecc, EDMA_EMR, 0)) + if ((val = edma_read_array(ecc, EDMA_EMR, 0))) j = 0; - else if (edma_read_array(ecc, EDMA_EMR, 1)) + else if ((val = edma_read_array(ecc, EDMA_EMR, 1))) j = 1; if (j >= 0) { - dev_dbg(ecc->dev, "EMR%d %08x\n", j, - edma_read_array(ecc, EDMA_EMR, j)); - for (i = 0; i < 32; i++) { + unsigned long emr = val; + + dev_dbg(ecc->dev, "EMR%d 0x%08x\n", j, val); + for (i = find_next_bit(&emr, 32, 0); i < 32; + i = find_next_bit(&emr, 32, i + 1)) { int k = (j << 5) + i; - if (edma_read_array(ecc, EDMA_EMR, j) & - BIT(i)) { - /* Clear the corresponding EMR bits */ - edma_write_array(ecc, EDMA_EMCR, j, + /* Clear the corresponding EMR bits */ + edma_write_array(ecc, EDMA_EMCR, j, BIT(i)); + /* Clear any SER */ + edma_shadow0_write_array(ecc, SH_SECR, j, BIT(i)); - /* Clear any SER */ - edma_shadow0_write_array(ecc, SH_SECR, - j, BIT(i)); - edma_error_handler(&ecc->slave_chans[k]); - } - } - } else if (edma_read(ecc, EDMA_QEMR)) { - dev_dbg(ecc->dev, "QEMR %02x\n", - edma_read(ecc, EDMA_QEMR)); - for (i = 0; i < 8; i++) { - if (edma_read(ecc, EDMA_QEMR) & BIT(i)) { - /* Clear the corresponding IPR bits */ - edma_write(ecc, EDMA_QEMCR, BIT(i)); - edma_shadow0_write(ecc, SH_QSECR, - BIT(i)); - - /* NOTE: not reported!! */ - } - } - } else if (edma_read(ecc, EDMA_CCERR)) { - dev_dbg(ecc->dev, "CCERR %08x\n", - edma_read(ecc, EDMA_CCERR)); - /* FIXME: CCERR.BIT(16) ignored! much better - * to just write CCERRCLR with CCERR value... - */ - for (i = 0; i < 8; i++) { - if (edma_read(ecc, EDMA_CCERR) & BIT(i)) { - /* Clear the corresponding IPR bits */ - edma_write(ecc, EDMA_CCERRCLR, BIT(i)); - - /* NOTE: not reported!! */ - } + edma_error_handler(&ecc->slave_chans[k]); } + } else if ((val = edma_read(ecc, EDMA_QEMR))) { + dev_dbg(ecc->dev, "QEMR 0x%02x\n", val); + /* Not reported, just clear the interrupt reason. */ + edma_write(ecc, EDMA_QEMCR, val); + edma_shadow0_write(ecc, SH_QSECR, val); + } else if ((val = edma_read(ecc, EDMA_CCERR))) { + dev_warn(ecc->dev, "CCERR 0x%08x\n", val); + /* Not reported, just clear the interrupt reason. */ + edma_write(ecc, EDMA_CCERRCLR, val); } + if (!edma_error_pending(ecc)) break; cnt++; -- 2.5.2
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