diff options
Diffstat (limited to 'target/linux/lantiq/patches-5.4/0110-MIPS-lantiq-dma-add-small-delay-after-reset.patch')
| -rw-r--r-- | target/linux/lantiq/patches-5.4/0110-MIPS-lantiq-dma-add-small-delay-after-reset.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-5.4/0110-MIPS-lantiq-dma-add-small-delay-after-reset.patch b/target/linux/lantiq/patches-5.4/0110-MIPS-lantiq-dma-add-small-delay-after-reset.patch new file mode 100644 index 0000000000..05227c8f89 --- /dev/null +++ b/target/linux/lantiq/patches-5.4/0110-MIPS-lantiq-dma-add-small-delay-after-reset.patch @@ -0,0 +1,32 @@ +From 497acc03cd3918baabe25d46e30c5c62b998e24d Mon Sep 17 00:00:00 2001 +From: Aleksander Jan Bajkowski <olek2@wp.pl> +Date: Sat, 19 Jun 2021 13:38:12 +0200 +Subject: [PATCH 1/5] MIPS: lantiq: dma: add small delay after reset + +Reading the DMA registers immediately after the reset causes +Data Bus Error. Adding a small delay fixes this problem. + +Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl> +--- + arch/mips/lantiq/xway/dma.c | 3 +++ + 1 file changed, 3 insertions(+) + +--- a/arch/mips/lantiq/xway/dma.c ++++ b/arch/mips/lantiq/xway/dma.c +@@ -11,6 +11,7 @@ + #include <linux/export.h> + #include <linux/spinlock.h> + #include <linux/clk.h> ++#include <linux/delay.h> + #include <linux/err.h> + + #include <lantiq_soc.h> +@@ -221,6 +222,8 @@ ltq_dma_init(struct platform_device *pde + clk_enable(clk); + ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL); + ++ usleep_range(1, 10); ++ + /* disable all interrupts */ + ltq_dma_w32(0, LTQ_DMA_IRNEN); + |