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ARM: dts: Fix occasional boot hang for am3 usb

Message ID 20231213073637.58778-1-tony@atomide.com
State New
Headers show
Series ARM: dts: Fix occasional boot hang for am3 usb | expand

Commit Message

Tony Lindgren Dec. 13, 2023, 7:36 a.m. UTC
With subtle timings changes, we can now sometimes get an external abort on
non-linefetch error booting am3 devices at sysc_reset(). This is because
of a missing reset delay needed for the usb target module.

Looks like we never enabled the delay earlier for am3, although a similar
issue was seen earlier with a similar usb setup for dm814x as described in
commit ebf244148092 ("ARM: OMAP2+: Use srst_udelay for USB on dm814x").

Cc: stable@vger.kernel.org
Fixes: 0782e8572ce4 ("ARM: dts: Probe am335x musb with ti-sysc")
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/boot/dts/ti/omap/am33xx.dtsi | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/arch/arm/boot/dts/ti/omap/am33xx.dtsi b/arch/arm/boot/dts/ti/omap/am33xx.dtsi
--- a/arch/arm/boot/dts/ti/omap/am33xx.dtsi
+++ b/arch/arm/boot/dts/ti/omap/am33xx.dtsi
@@ -359,6 +359,7 @@  usb: target-module@47400000 {
 					<SYSC_IDLE_NO>,
 					<SYSC_IDLE_SMART>,
 					<SYSC_IDLE_SMART_WKUP>;
+			ti,sysc-delay-us = <2>;
 			clocks = <&l3s_clkctrl AM3_L3S_USB_OTG_HS_CLKCTRL 0>;
 			clock-names = "fck";
 			#address-cells = <1>;