diff options
Diffstat (limited to 'target/linux/lantiq/patches-5.4/0112-MIPS-lantiq-dma-fix-burst-length-for-DEU.patch')
| -rw-r--r-- | target/linux/lantiq/patches-5.4/0112-MIPS-lantiq-dma-fix-burst-length-for-DEU.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-5.4/0112-MIPS-lantiq-dma-fix-burst-length-for-DEU.patch b/target/linux/lantiq/patches-5.4/0112-MIPS-lantiq-dma-fix-burst-length-for-DEU.patch new file mode 100644 index 0000000000..67423d2e97 --- /dev/null +++ b/target/linux/lantiq/patches-5.4/0112-MIPS-lantiq-dma-fix-burst-length-for-DEU.patch @@ -0,0 +1,41 @@ +From 7d9ea9052d6680d2910b8b005c397d95b3a8b012 Mon Sep 17 00:00:00 2001 +From: Aleksander Jan Bajkowski <olek2@wp.pl> +Date: Wed, 7 Apr 2021 21:04:39 +0200 +Subject: [PATCH 3/5] MIPS: lantiq: dma: fix burst length for DEU + +The current definition of 2W burst length is invalid. +This patch fixes it. Current downstream DEU driver doesn't +use DMA. An incorrect burst length value doesn't cause any +errors. This patch also adds other burst length values. + +Fixes: dfec1a827d2b ("MIPS: Lantiq: Add DMA support") +Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl> +--- + arch/mips/lantiq/xway/dma.c | 9 +++++++-- + 1 file changed, 7 insertions(+), 2 deletions(-) + +--- a/arch/mips/lantiq/xway/dma.c ++++ b/arch/mips/lantiq/xway/dma.c +@@ -40,7 +40,11 @@ + #define DMA_IRQ_ACK 0x7e /* IRQ status register */ + #define DMA_POLL BIT(31) /* turn on channel polling */ + #define DMA_CLK_DIV4 BIT(6) /* polling clock divider */ +-#define DMA_2W_BURST BIT(1) /* 2 word burst length */ ++#define DMA_PCTRL_2W_BURST 0x1 /* 2 word burst length */ ++#define DMA_PCTRL_4W_BURST 0x2 /* 4 word burst length */ ++#define DMA_PCTRL_8W_BURST 0x3 /* 8 word burst length */ ++#define DMA_TX_BURST_SHIFT 4 /* tx burst shift */ ++#define DMA_RX_BURST_SHIFT 2 /* rx burst shift */ + #define DMA_ETOP_ENDIANNESS (0xf << 8) /* endianness swap etop channels */ + #define DMA_WEIGHT (BIT(17) | BIT(16)) /* default channel wheight */ + +@@ -191,7 +195,8 @@ ltq_dma_init_port(int p) + break; + + case DMA_PORT_DEU: +- ltq_dma_w32((DMA_2W_BURST << 4) | (DMA_2W_BURST << 2), ++ ltq_dma_w32((DMA_PCTRL_2W_BURST << DMA_TX_BURST_SHIFT) | ++ (DMA_PCTRL_2W_BURST << DMA_RX_BURST_SHIFT), + LTQ_DMA_PCTRL); + break; + |