The patch ASoC: sprd: Add reserved DMA memory support has been applied to the asoc tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.2 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From 25a073bb9ceda91b8bf731b20ac01b68cc8877a9 Mon Sep 17 00:00:00 2001 From: Baolin Wang <baolin.wang@xxxxxxxxxx> Date: Fri, 12 Apr 2019 14:40:17 +0800 Subject: [PATCH] ASoC: sprd: Add reserved DMA memory support For Spreadtrum audio platform driver, it need allocate a larger DMA buffer dynamically to copy audio data between userspace and kernel space, but that will increase the risk of memory allocation failure especially the system is under heavy load situation. To make sure the audio can work in this scenario, we usually reserve one region of memory to be used as a shared pool of DMA buffers for the platform component. So add of_reserved_mem_device_init_by_idx() function to initialize the shared pool of DMA buffers to be used by the platform component. Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> --- sound/soc/sprd/sprd-pcm-dma.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/sound/soc/sprd/sprd-pcm-dma.c b/sound/soc/sprd/sprd-pcm-dma.c index 9be6d4b2bf74..d38ebbbbf169 100644 --- a/sound/soc/sprd/sprd-pcm-dma.c +++ b/sound/soc/sprd/sprd-pcm-dma.c @@ -6,6 +6,7 @@ #include <linux/dma/sprd-dma.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/of_reserved_mem.h> #include <linux/platform_device.h> #include <sound/pcm.h> #include <sound/pcm_params.h> @@ -530,8 +531,14 @@ static const struct snd_soc_component_driver sprd_soc_component = { static int sprd_soc_platform_probe(struct platform_device *pdev) { + struct device_node *np = pdev->dev.of_node; int ret; + ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0); + if (ret) + dev_warn(&pdev->dev, + "no reserved DMA memory for audio platform device\n"); + ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component, NULL, 0); if (ret) -- 2.20.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
