From 4ab54f696dc5299d7db9d924f28f408dc0404f1b Mon Sep 17 00:00:00 2001 From: Peter Ujfalusi Date: Wed, 14 Oct 2015 14:43:04 +0300 Subject: [PATCH] dmaengine: edma: Read channel mapping support only once from HW Instead of directly reading it from CCCFG register take the information out once when we set up the configuration from the HW. Signed-off-by: Peter Ujfalusi Signed-off-by: Vinod Koul --- drivers/dma/edma.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index d105d1ae0f13..4b2ccc9de0ad 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -223,6 +223,7 @@ struct edma_cc { unsigned num_region; unsigned num_slots; unsigned num_tc; + bool chmap_exist; enum dma_event_q default_queue; bool unused_chan_list_done; @@ -1930,11 +1931,14 @@ static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata, value = GET_NUM_EVQUE(cccfg); ecc->num_tc = value + 1; + ecc->chmap_exist = (cccfg & CHMAP_EXIST) ? true : false; + dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg); dev_dbg(dev, "num_region: %u\n", ecc->num_region); dev_dbg(dev, "num_channels: %u\n", ecc->num_channels); dev_dbg(dev, "num_slots: %u\n", ecc->num_slots); dev_dbg(dev, "num_tc: %u\n", ecc->num_tc); + dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no"); /* Nothing need to be done if queue priority is provided */ if (pdata->queue_priority_mapping) @@ -2223,7 +2227,7 @@ static int edma_probe(struct platform_device *pdev) queue_priority_mapping[i][1]); /* Map the channel to param entry if channel mapping logic exist */ - if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST) + if (ecc->chmap_exist) edma_direct_dmach_to_param_mapping(ecc); for (i = 0; i < ecc->num_region; i++) { @@ -2293,7 +2297,7 @@ static int edma_pm_resume(struct device *dev) queue_priority_mapping[i][1]); /* Map the channel to param entry if channel mapping logic */ - if (edma_read(ecc, EDMA_CCCFG) & CHMAP_EXIST) + if (ecc->chmap_exist) edma_direct_dmach_to_param_mapping(ecc); for (i = 0; i < ecc->num_channels; i++) { -- 2.20.1