From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: [PATCH v3 2/2] soc/tegra: fuse: Explicitly request DMA channel from APB DMA driver Date: Fri, 20 Oct 2017 01:08:04 +0300 Message-ID: <059ca713c7416aedeb0080ab4b8a49da430a30b9.1508450681.git.digetx@gmail.com> References: Return-path: In-Reply-To: In-Reply-To: References: Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Thierry Reding , Jonathan Hunter Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-tegra@vger.kernel.org Currently fuse driver requests DMA channel from an arbitrary DMA device, it is not a problem since there is only one DMA provider for Tegra20 yet, but it may become troublesome if another provider will appear. Signed-off-by: Dmitry Osipenko --- drivers/soc/tegra/fuse/fuse-tegra20.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/soc/tegra/fuse/fuse-tegra20.c b/drivers/soc/tegra/fuse/fuse-tegra20.c index 27e9ac7d3165..49ff017f3ded 100644 --- a/drivers/soc/tegra/fuse/fuse-tegra20.c +++ b/drivers/soc/tegra/fuse/fuse-tegra20.c @@ -96,6 +96,13 @@ static u32 tegra20_fuse_read(struct tegra_fuse *fuse, unsigned int offset) return value; } +static bool dma_filter(struct dma_chan *chan, void *filter_param) +{ + struct device_node *np = chan->device->dev->of_node; + + return of_device_is_compatible(np, "nvidia,tegra20-apbdma"); +} + static int tegra20_fuse_probe(struct tegra_fuse *fuse) { dma_cap_mask_t mask; @@ -103,7 +110,7 @@ static int tegra20_fuse_probe(struct tegra_fuse *fuse) dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); - fuse->apbdma.chan = dma_request_channel(mask, NULL, NULL); + fuse->apbdma.chan = __dma_request_channel(&mask, dma_filter, NULL); if (!fuse->apbdma.chan) return -EPROBE_DEFER; -- 2.14.2