From 4224b52c3acc7203e7c2535d6806f30432dae5e3 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sun, 17 Jan 2016 10:42:23 +0000 Subject: brcm2708: add linux 4.4 support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit - random-bcm2708 and spi-bcm2708 have been removed. - sound-soc-bcm2708-i2s has been upstreamed as sound-soc-bcm2835-i2s. Let's keep linux 4.1 for a while, since linux 4.4 appears to have some issues with multicast traffic on RPi ethernet: https://gist.github.com/Noltari/5b1cfdecce5ed4bc08fd Signed-off-by: Álvaro Fernández Rojas SVN-Revision: 48266 --- ...-Limit-cyclic-transfers-on-lite-channels-.patch | 37 ++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 target/linux/brcm2708/patches-4.4/0024-bcm2835-dma-Limit-cyclic-transfers-on-lite-channels-.patch (limited to 'target/linux/brcm2708/patches-4.4/0024-bcm2835-dma-Limit-cyclic-transfers-on-lite-channels-.patch') diff --git a/target/linux/brcm2708/patches-4.4/0024-bcm2835-dma-Limit-cyclic-transfers-on-lite-channels-.patch b/target/linux/brcm2708/patches-4.4/0024-bcm2835-dma-Limit-cyclic-transfers-on-lite-channels-.patch new file mode 100644 index 0000000000..4461fec7a9 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0024-bcm2835-dma-Limit-cyclic-transfers-on-lite-channels-.patch @@ -0,0 +1,37 @@ +From c7e464c38d38ad59899c94dfad6c3455c18f7d76 Mon Sep 17 00:00:00 2001 +From: Matthias Reichl +Date: Sun, 11 Oct 2015 12:28:30 +0200 +Subject: [PATCH 024/127] bcm2835-dma: Limit cyclic transfers on lite channels + to 32k + +Transfers larger than 32k cause repeated clicking with I2S soundcards. +The exact reason is yet unknown, so limit to 32k as bcm2708-dmaengine +did as an intermediate fix. +--- + drivers/dma/bcm2835-dma.c | 8 +++++++- + 1 file changed, 7 insertions(+), 1 deletion(-) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -144,6 +144,12 @@ struct bcm2835_desc { + */ + #define MAX_LITE_TRANSFER (SZ_64K - 4) + ++/* ++ * Transfers larger than 32k cause issues with the bcm2708-i2s driver, ++ * so limit transfer size to 32k as bcm2708-dmaengine did. ++ */ ++#define MAX_CYCLIC_LITE_TRANSFER SZ_32K ++ + static inline struct bcm2835_dmadev *to_bcm2835_dma_dev(struct dma_device *d) + { + return container_of(d, struct bcm2835_dmadev, ddev); +@@ -412,7 +418,7 @@ static struct dma_async_tx_descriptor *b + d->c = c; + d->dir = direction; + if (c->ch >= 8) /* LITE channel */ +- max_size = MAX_LITE_TRANSFER; ++ max_size = MAX_CYCLIC_LITE_TRANSFER; + else + max_size = MAX_NORMAL_TRANSFER; + period_len = min(period_len, max_size); -- cgit v1.2.3