8f9e91ad03
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
33 lines
1.3 KiB
Diff
33 lines
1.3 KiB
Diff
From cd231d4775b14f228606c09f219b48308f6ab3aa Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Wed, 26 Mar 2025 11:28:28 +0000
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Subject: [PATCH] dts: rp1: Don't use DMA with UARTs
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DMA has been enabled on RP1's UART0, but with mixed success. Transmits
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seem to work, but the DMA interface is not well suited to receiving
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arbitrary amounts of data. In particular, the PL011 driver is slow to
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pass on the received data, batching it into large blocks.
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On balance, it's better to just disable the DMA support. As with the
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other UARTs, the required runes are left in the DTS as comments.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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arch/arm64/boot/dts/broadcom/rp1.dtsi | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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--- a/arch/arm64/boot/dts/broadcom/rp1.dtsi
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+++ b/arch/arm64/boot/dts/broadcom/rp1.dtsi
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@@ -65,9 +65,9 @@
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interrupts = <RP1_INT_UART0 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&rp1_clocks RP1_CLK_UART &rp1_clocks RP1_PLL_SYS_PRI_PH>;
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clock-names = "uartclk", "apb_pclk";
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- dmas = <&rp1_dma RP1_DMA_UART0_TX>,
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- <&rp1_dma RP1_DMA_UART0_RX>;
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- dma-names = "tx", "rx";
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+ // dmas = <&rp1_dma RP1_DMA_UART0_TX>,
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+ // <&rp1_dma RP1_DMA_UART0_RX>;
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+ // dma-names = "tx", "rx";
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pinctrl-names = "default";
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arm,primecell-periphid = <0x00341011>;
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uart-has-rtscts;
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