From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 836D237EFE2; Sat, 12 Sep 2026 19:20:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789240823; cv=none; b=WLTUs/pDGS/Euv4WVfRhq75fzHn70XQmdbNVNPRqjVSFBRuwnpXTTzqQysp/MkeEmhY9KVjqHgHfRA5upL6skY52RDUJ9NU3zzPifTfd8kVVe6pBy7gwq2DcqMlbI7/YTfl6VLz1aoor56wVYpWKqcWSoo7+430Wicq3NqQnDUA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789240823; c=relaxed/simple; bh=YXDuAKIPw39rxwnk+KLwyfwswt7zMPLUtQzCKV8EQ58=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Bwlqz5T3K4eG+mAyVs3J2l0UcZ1ppsvjBuSZD8uMvpu7rDkxeCJfZi/n8Ly419Sd3CS0zI0cjfXR7PburinY7dk9hWeMRvSf4nCmheLeZUb1CrgohcYKDZl7P60BMEGH3d3SdN0vtYEnbm97zKJj4BBDIJNo8mBEbnGziDtimac= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pZ1TlJlP; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="pZ1TlJlP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7ED4B1F000FF; Sat, 12 Sep 2026 19:20:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789240820; bh=Y+1n70C0KcXgcR7vekqR04hvYmn9HdGFJPMmY7Cco64=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=pZ1TlJlP2pSSrDUa2S+V/VH+PpY89E9QtI8VoWK4FZg6M957CWDYzcZfcxtj0CYLL +i4ZxxyhkeuoI45yKXmwnA6zGsuOKsM+CAcKAtUKbBXheEDqTvuOk7wxdJeSy1hHcx rqs+f7412TRdOjaeYb86Cfw7COHZ0lkwurLECz9o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Indrek Kruusa , Felix Yan , Daniel Lezcano , Jernej Skrabec Subject: [PATCH 5.10 003/798] clocksource/drivers/timer-sun4i: Advertise a real minimum delta Date: Sat, 12 Sep 2026 08:53:51 +0200 Message-ID: <20260912065517.035792242@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065516.948645775@linuxfoundation.org> References: <20260912065516.948645775@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Felix Yan commit d21808328225ab8cee46885bf9a0dffcefbe630e upstream. sun4i_clkevt_next_event() compensates for the timer stop/start synchronization delay by programming evt - TIMER_SYNC_TICKS into the hardware interval register. The clockevent device currently advertises TIMER_SYNC_TICKS as min_delta_ticks, so the clockevents core is allowed to call set_next_event() with evt == TIMER_SYNC_TICKS. That programs a zero-tick interval. With oneshot/highres/nohz timer operation this can leave the next event stuck, which was observed as a boot hang on Allwinner D1 after the clockevents core started reusing forced minimum-delta events. Advertise one extra tick instead, so the smallest event accepted by the core still programs at least one hardware tick after the synchronization compensation. Fixes: 12e1480bcb49 ("clocksource: sun4i: Report the minimum tick that we can program") Reported-by: Indrek Kruusa Closes: https://lore.kernel.org/linux-riscv/CA+fTLhgLmTY+exGujKf8OYYQvcEW5X5NJ_5sLq2AYL6zER2c0A@mail.gmail.com/ Assisted-by: Codex:gpt-5.5 Signed-off-by: Felix Yan Signed-off-by: Daniel Lezcano Tested-by: Indrek Kruusa Acked-by: Jernej Skrabec Cc: stable@vger.kernel.org Link: https://lore.kernel.org/linux-riscv/CA+fTLhgLmTY+exGujKf8OYYQvcEW5X5NJ_5sLq2AYL6zER2c0A@mail.gmail.com/ Link: https://patch.msgid.link/20260624220434.4183732-1-felixonmars@archlinux.org Signed-off-by: Greg Kroah-Hartman --- drivers/clocksource/timer-sun4i.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/clocksource/timer-sun4i.c +++ b/drivers/clocksource/timer-sun4i.c @@ -209,7 +209,7 @@ static int __init sun4i_timer_init(struc sun4i_timer_clear_interrupt(timer_of_base(&to)); clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), - TIMER_SYNC_TICKS, 0xffffffff); + TIMER_SYNC_TICKS + 1, 0xffffffff); /* Enable timer0 interrupt */ val = readl(timer_of_base(&to) + TIMER_IRQ_EN_REG);