diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0343-bcm2835-dma-only-reserve-channel-0-if-legacy-dma-dri.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0343-bcm2835-dma-only-reserve-channel-0-if-legacy-dma-dri.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0343-bcm2835-dma-only-reserve-channel-0-if-legacy-dma-dri.patch b/target/linux/bcm27xx/patches-5.10/950-0343-bcm2835-dma-only-reserve-channel-0-if-legacy-dma-dri.patch new file mode 100644 index 0000000000..bf7ae54c08 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0343-bcm2835-dma-only-reserve-channel-0-if-legacy-dma-dri.patch @@ -0,0 +1,32 @@ +From 137865877ea138ef9c593ce74cbd4ddc2560e057 Mon Sep 17 00:00:00 2001 +From: Matthias Reichl <hias@horus.com> +Date: Sun, 11 Oct 2020 00:48:55 +0200 +Subject: [PATCH] bcm2835-dma: only reserve channel 0 if legacy dma + driver is enabled + +If CONFIG_DMA_BCM2708 isn't enabled there's no need to mask out +one of the already scarce DMA channels. + +Signed-off-by: Matthias Reichl <hias@horus.com> +--- + drivers/dma/bcm2835-dma.c | 2 ++ + 1 file changed, 2 insertions(+) + +--- a/drivers/dma/bcm2835-dma.c ++++ b/drivers/dma/bcm2835-dma.c +@@ -1283,6 +1283,7 @@ static int bcm2835_dma_probe(struct plat + goto err_no_dma; + } + ++#ifdef CONFIG_DMA_BCM2708 + /* One channel is reserved for the legacy API */ + if (chans_available & BCM2835_DMA_BULK_MASK) { + rc = bcm_dmaman_probe(pdev, base, +@@ -1293,6 +1294,7 @@ static int bcm2835_dma_probe(struct plat + + chans_available &= ~BCM2835_DMA_BULK_MASK; + } ++#endif + + /* And possibly one for the 40-bit DMA memcpy API */ + if (chans_available & od->cfg_data->chan_40bit_mask & |