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Fri, 02 Oct 2026 00:21:36 -0700 (PDT) Received: from luca-vm.lan ([154.61.61.58]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48b38104e07sm3564479f8f.31.2026.10.02.00.21.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Oct 2026 00:21:35 -0700 (PDT) From: Luca Leonardo Scorcia To: linux-mediatek@lists.infradead.org Cc: Luca Leonardo Scorcia , Daniel Lezcano , Thomas Gleixner , Matthias Brugger , AngeloGioacchino Del Regno , Stanley Chu , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/3] clocksource/drivers/timer-mediatek: Fix random crash at boot Date: Fri, 2 Oct 2026 09:19:26 +0200 Message-ID: <20261002072115.169250-2-l.scorcia@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261002072115.169250-1-l.scorcia@gmail.com> References: <20261002072115.169250-1-l.scorcia@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261002_002138_541321_3F4AA615 X-CRM114-Status: GOOD ( 16.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org MediaTek bootloaders generally enable APXGPT timers at boot. This means that a timer IRQ can sometimes happen between the IRQ line request and the configuration of the clock event handler. This leads to a hard crash with an instruction abort, branch to pc 0x0 in mtk_gpt_interrupt handler as clkevt is null. To avoid this issue request the IRQ with IRQF_NO_AUTOEN and enable it explicitly after the clock event is configured. Issue was reported and fix tested on the Lenovo Tab E7 (TB-7104F, mt8167). Fixes: a0858f937960 ("clocksource/drivers/timer-mediatek: Convert the driver to timer-of") Signed-off-by: Luca Leonardo Scorcia --- Credits for issue discovery and suggested fix go to matemiller992 on postmarketOS forums. I am submitting it upstream with permission. Not adding Reported-by or Suggested-by tags because it was requested not to share real name. drivers/clocksource/timer-mediatek.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c index 7bcb4a3f26fb..e20075b09fab 100644 --- a/drivers/clocksource/timer-mediatek.c +++ b/drivers/clocksource/timer-mediatek.c @@ -277,7 +277,7 @@ static struct timer_of to = { }, .of_irq = { - .flags = IRQF_TIMER | IRQF_IRQPOLL, + .flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_NO_AUTOEN, }, }; @@ -298,6 +298,7 @@ static int __init mtk_syst_init(struct device_node *node) clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), TIMER_SYNC_TICKS, 0xffffffff); + enable_irq(timer_of_irq(&to)); return 0; } @@ -334,6 +335,7 @@ static int __init mtk_gpt_init(struct device_node *node) TIMER_SYNC_TICKS, 0xffffffff); mtk_gpt_enable_irq(&to, TIMER_CLK_EVT); + enable_irq(timer_of_irq(&to)); return 0; } -- 2.43.0