From a3e49499981487eb0e5e7706ba5bc972b98859a0 Mon Sep 17 00:00:00 2001 From: Sander Vanheule Date: Thu, 21 Jul 2022 22:43:39 +0200 Subject: [PATCH] realtek: clear spurious GPIO interrupts The interrupt controller in the internal GPIO peripheral will sometimes generate spurious interrupts. If these are not properly acknowledged, the system will be held busy until reboot. These spurious interrupts are identified by the fact that there is no system IRQ number associated, since the interrupt line was never allocated. Although most prevalent on RTL839x, RTL838x SoCs have also displayed this behaviour. Reported-by: Luiz Angelo Daros de Luca # DGS-1210-52 Reported-by: Birger Koblitz # Netgear GS724TP v2 Reported-by: Jan Hoffmann # HPE 1920-16G Signed-off-by: Sander Vanheule --- ...ealtek-otto-clear-spurious-interrups.patch | 30 +++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 target/linux/realtek/patches-5.10/317-gpio-realtek-otto-clear-spurious-interrups.patch diff --git a/target/linux/realtek/patches-5.10/317-gpio-realtek-otto-clear-spurious-interrups.patch b/target/linux/realtek/patches-5.10/317-gpio-realtek-otto-clear-spurious-interrups.patch new file mode 100644 index 0000000000..6e5957d13e --- /dev/null +++ b/target/linux/realtek/patches-5.10/317-gpio-realtek-otto-clear-spurious-interrups.patch @@ -0,0 +1,30 @@ +realtek: clear spurious GPIO interrupts + +The interrupt controller in the internal GPIO peripheral will sometimes +generate spurious interrupts. If these are not properly acknowledged, the +system will be held busy until reboot. These spurious interrupts are identified +by the fact that there is no system IRQ number associated, since the interrupt +line was never allocated. Although most prevalent on RTL839x, RTL838x SoCs have +also displayed this behaviour. + +Reported-by: Luiz Angelo Daros de Luca # DGS-1210-52 +Reported-by: Birger Koblitz # Netgear GS724TP v2 +Reported-by: Jan Hoffmann # HPE 1920-16G +Signed-off-by: Sander Vanheule +--- + drivers/gpio/gpio-realtek-otto.c | 4 ++++ + 1 file changed, 4 insertions(+) + +--- a/drivers/gpio/gpio-realtek-otto.c ++++ b/drivers/gpio/gpio-realtek-otto.c +@@ -251,6 +251,10 @@ static void realtek_gpio_irq_handler(str + port_pin_count = min(gc->ngpio - lines_done, 8U); + for_each_set_bit(offset, &status, port_pin_count) { + irq = irq_find_mapping(gc->irq.domain, offset + lines_done); ++ if (unlikely(!irq)) { ++ realtek_gpio_clear_isr(ctrl, lines_done / 8, BIT(offset)); ++ continue; ++ } + generic_handle_irq(irq); + } + } -- 2.30.2