Messages in this thread Patch in this message |  | | From | Peter Ujfalusi <> | Subject | [PATCH 12/13] [media] omap3isp: Support for deferred probing when requesting DMA channel | Date | Tue, 26 May 2015 16:26:07 +0300 |
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Switch to use ma_request_slave_channel_compat_reason() to request the DMA channel. Only fall back to pio mode if the error code returned is not -EPROBE_DEFER, otherwise return from the probe with the -EPROBE_DEFER.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> CC: Laurent Pinchart <laurent.pinchart@ideasonboard.com> CC: Mauro Carvalho Chehab <mchehab@osg.samsung.com> --- drivers/media/platform/omap3isp/isphist.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/omap3isp/isphist.c b/drivers/media/platform/omap3isp/isphist.c index 7138b043a4aa..e690ca13af0e 100644 --- a/drivers/media/platform/omap3isp/isphist.c +++ b/drivers/media/platform/omap3isp/isphist.c @@ -499,14 +499,20 @@ int omap3isp_hist_init(struct isp_device *isp) if (res) sig = res->start; - hist->dma_ch = dma_request_slave_channel_compat(mask, + hist->dma_ch = dma_request_slave_channel_compat_reason(mask, omap_dma_filter_fn, &sig, isp->dev, "hist"); - if (!hist->dma_ch) + if (IS_ERR(hist->dma_ch)) { + ret = PTR_ERR(hist->dma_ch); + if (ret == -EPROBE_DEFER) + return ret; + + hist->dma_ch = NULL; dev_warn(isp->dev, "hist: DMA channel request failed, using PIO\n"); - else + } else { dev_dbg(isp->dev, "hist: using DMA channel %s\n", dma_chan_name(hist->dma_ch)); + } } hist->ops = &hist_ops; -- 2.3.5
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