ARM: dts: stm32: activate alternate REQ/ACK dma protocol for uart

Default REQ/ACK DMA protocol consists in maintaining ACK signal up to the removal of REQuest and the transfer completion. In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the removal of the REQuest, but only the transfer completion. Due to a possible DMA stream lock when transferring data to/from STM32 USART/UART, select this alternative protocol in STM32 USART/UART nodes. Signed-off-by: Valentin Caron <[email protected]> Change-Id: Ia5c1205e1a74a06ff670006e9fbf619ad45deeb5 Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/186820 Reviewed-by: CITOOLS <[email protected]> Reviewed-by: CIBUILD <[email protected]> Reviewed-by: Fabrice GASNIER <[email protected]>
STMicroelectronics · Dec 7, 2020 · e1b933d · e1b933d
1 parent 38078f0
commit e1b933d
Showing 1 changed file with 14 additions and 14 deletions.
diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -535,8 +535,8 @@
 			clocks = <&rcc USART2_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 43 0x400 0x5>,
-			       <&dmamux1 44 0x400 0x1>;
+			dmas = <&dmamux1 43 0x400 0x15>,
+			       <&dmamux1 44 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};
@@ -548,8 +548,8 @@
 			clocks = <&rcc USART3_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 45 0x400 0x5>,
-			       <&dmamux1 46 0x400 0x1>;
+			dmas = <&dmamux1 45 0x400 0x15>,
+			       <&dmamux1 46 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};
@@ -561,8 +561,8 @@
 			clocks = <&rcc UART4_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 63 0x400 0x5>,
-			       <&dmamux1 64 0x400 0x1>;
+			dmas = <&dmamux1 63 0x400 0x15>,
+			       <&dmamux1 64 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};
@@ -574,8 +574,8 @@
 			clocks = <&rcc UART5_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 65 0x400 0x5>,
-			       <&dmamux1 66 0x400 0x1>;
+			dmas = <&dmamux1 65 0x400 0x15>,
+			       <&dmamux1 66 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};
@@ -696,8 +696,8 @@
 			clocks = <&rcc UART7_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 79 0x400 0x5>,
-			       <&dmamux1 80 0x400 0x1>;
+			dmas = <&dmamux1 79 0x400 0x15>,
+			       <&dmamux1 80 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};
@@ -709,8 +709,8 @@
 			clocks = <&rcc UART8_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 81 0x400 0x5>,
-			       <&dmamux1 82 0x400 0x1>;
+			dmas = <&dmamux1 81 0x400 0x15>,
+			       <&dmamux1 82 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};
@@ -794,8 +794,8 @@
 			clocks = <&rcc USART6_K>;
 			wakeup-source;
 			power-domains = <&pd_core>;
-			dmas = <&dmamux1 71 0x400 0x5>,
-			       <&dmamux1 72 0x400 0x1>;
+			dmas = <&dmamux1 71 0x400 0x15>,
+			       <&dmamux1 72 0x400 0x11>;
 			dma-names = "rx", "tx";
 			status = "disabled";
 		};