linux-kernel - [PATCH] Revert "ARM: dts: bcm2711: Add the BSC interrupt controller"

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Message-Id: <20210212191104.2365912-1-f.fainelli@gmail.com>
Date:   Fri, 12 Feb 2021 11:11:04 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     dave.stevenson@...pberrypi.com, maz@...nel.org, eric@...olt.net,
        tzimmermann@...e.de, linux-rpi-kernel@...ts.infradead.org,
        hverkuil-cisco@...all.nl, nsaenzjulienne@...e.de,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        dri-devel@...ts.freedesktop.org, maxime@...no.tech,
        Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] Revert "ARM: dts: bcm2711: Add the BSC interrupt controller"

As Dave reported:

This seems to have unintended side effects.  GIC interrupt 117 is shared
between the standard I2C controllers (i2c-bcm2835) and the l2-intc block
handling the HDMI I2C interrupts.

There is not a great way to share an interrupt between an interrupt
controller using the chained IRQ handler which is an interrupt flow and
another driver like i2c-bcm2835 which uses an interrupt handler
(although it specifies IRQF_SHARED).

Simply revert this change for now which will mean that HDMI I2C will be
polled, like it was before.

Reported-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 arch/arm/boot/dts/bcm2711.dtsi | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
index 462b1dfb0385..720beec54d61 100644
--- a/arch/arm/boot/dts/bcm2711.dtsi
+++ b/arch/arm/boot/dts/bcm2711.dtsi
@@ -308,14 +308,6 @@ dvp: clock@...00000 {
 			#reset-cells = <1>;
 		};
 
-		bsc_intr: interrupt-controller@...00040 {
-			compatible = "brcm,bcm2711-l2-intc", "brcm,l2-intc";
-			reg = <0x7ef00040 0x30>;
-			interrupts = <GIC_SPI 117 IRQ_TYPE_LEVEL_HIGH>;
-			interrupt-controller;
-			#interrupt-cells = <1>;
-		};
-
 		aon_intr: interrupt-controller@...00100 {
 			compatible = "brcm,bcm2711-l2-intc", "brcm,l2-intc";
 			reg = <0x7ef00100 0x30>;
@@ -362,8 +354,6 @@ ddc0: i2c@...04500 {
 			reg = <0x7ef04500 0x100>, <0x7ef00b00 0x300>;
 			reg-names = "bsc", "auto-i2c";
 			clock-frequency = <97500>;
-			interrupt-parent = <&bsc_intr>;
-			interrupts = <0>;
 			status = "disabled";
 		};
 
@@ -405,8 +395,6 @@ ddc1: i2c@...09500 {
 			reg = <0x7ef09500 0x100>, <0x7ef05b00 0x300>;
 			reg-names = "bsc", "auto-i2c";
 			clock-frequency = <97500>;
-			interrupt-parent = <&bsc_intr>;
-			interrupts = <1>;
 			status = "disabled";
 		};
 	};
-- 
2.25.1