diff options
| author | Gustavo Pimentel <Gustavo.Pimentel@synopsys.com> | 2021-02-18 20:03:59 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2021-03-16 22:58:53 +0530 |
| commit | 1aef6ffe999eec7b7fdcfad7ffef9c157727ffcb (patch) | |
| tree | 8c7fa5e494bdef0c881db7e00481d3e197a7a1e9 /drivers/dma/dw-edma/dw-edma-core.c | |
| parent | c124fd9a969acaa83f6dfa5e160a99a500af9e4b (diff) | |
dmaengine: dw-edma: Add PCIe VSEC data retrieval support
The latest eDMA IP development implements a Vendor-Specific Extended
Capability that contains the eDMA BAR, offset, map format, and the
number of read/write channels available.
Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/0b880b8893ff457ffc1b5071a1c7f47e61ceea1c.1613674948.git.gustavo.pimentel@synopsys.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/dw-edma/dw-edma-core.c')
| -rw-r--r-- | drivers/dma/dw-edma/dw-edma-core.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index 08d71dafa001..18a2878d2c50 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -863,15 +863,19 @@ int dw_edma_probe(struct dw_edma_chip *chip) raw_spin_lock_init(&dw->lock); - /* Find out how many write channels are supported by hardware */ - dw->wr_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE); - if (!dw->wr_ch_cnt) - return -EINVAL; + if (!dw->wr_ch_cnt) { + /* Find out how many write channels are supported by hardware */ + dw->wr_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE); + if (!dw->wr_ch_cnt) + return -EINVAL; + } - /* Find out how many read channels are supported by hardware */ - dw->rd_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ); - if (!dw->rd_ch_cnt) - return -EINVAL; + if (!dw->rd_ch_cnt) { + /* Find out how many read channels are supported by hardware */ + dw->rd_ch_cnt = dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ); + if (!dw->rd_ch_cnt) + return -EINVAL; + } dev_vdbg(dev, "Channels:\twrite=%d, read=%d\n", dw->wr_ch_cnt, dw->rd_ch_cnt); |