From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1FE9F36C9D0 for ; Sat, 28 Feb 2026 18:10:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302220; cv=none; b=CEPXdG3i1vrVoNimidhb/nNIiOcg+zRyfiChMZF9HZVb5UUKCrkM+5M5t/8Ef8Msw3SpX+FanO/r07Ym9Unz4MlvS7BWvpp4kiM/s82y7tUl71AJJS5GnxsdhnUlFWqClvfU4dlEzlU+ydUGtrGVA3uSj/OmbARapRmnhmzg/AM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772302220; c=relaxed/simple; bh=GR69O+x54Fgm/Ah8XG5KQPAerQOlnAyJMmX/b7fBqPY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=ffErUUId0uHaYN3DywqiJuUIS2RT3uqvl8cjLEcd9vp3/R8yM9gJxmMPoYIX/q1FWdnszdyhnKq8WQ/1dDYwcjglvDc4dNQCFOCVOX9vOYx47rrdM8sDEaSfWrEjCMsbs19eBNxpforj+Xbz8sMiHLSjibAPChVQjNHQv3QesWw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YuMdXGVl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YuMdXGVl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D3A7C19423; Sat, 28 Feb 2026 18:10:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772302220; bh=GR69O+x54Fgm/Ah8XG5KQPAerQOlnAyJMmX/b7fBqPY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YuMdXGVli64N2em62+WEPB4bH6FvuJSD4OYwa4a8yBLIQw3twhhhrr9BRDK0kZCOH wER1jWqRQRfcf+Qc6m5jnKVDBnv+CjkZJpZYKrQG1zMEI1C5kNjZLC16m+gYfz8LRU pWmMegx8NuK6kJvODX7YKvAay9haT9M5ysm4qX85yZfYsXLIBkDbee0tB10HKL2KyR En6I0eWszlItWwKUX868z85y1WS1MWd8dBcs3uCeRLgqGL/lFfMkuOzHk1LkYf34rg gcp++YSq8uWS5/yvL9afxLbyLaAC1D2rzMGLwSRH7xm/P3ISia+NoZCA7xYAHawv9R mzoqAswaumusA== From: Sasha Levin To: patches@lists.linux.dev Cc: =?UTF-8?q?Nuno=20S=C3=A1?= , Michael Hennerich , Vinod Koul , Sasha Levin Subject: [PATCH 6.6 227/283] dma: dma-axi-dmac: fix SW cyclic transfers Date: Sat, 28 Feb 2026 13:06:09 -0500 Message-ID: <20260228180709.1583486-227-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228180709.1583486-1-sashal@kernel.org> References: <20260228180709.1583486-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Nuno Sá [ Upstream commit 9bd257181fd5c996d922e9991500ad27987cfbf4 ] If 'hw_cyclic' is false we should still be able to do cyclic transfers in "software". That was not working for the case where 'desc->num_sgs' is 1 because 'chan->next_desc' is never set with the current desc which means that the cyclic transfer only runs once and in the next SOT interrupt we do nothing since vchan_next_desc() will return NULL. Fix it by setting 'chan->next_desc' as soon as we get a new desc via vchan_next_desc(). Fixes: 0e3b67b348b8 ("dmaengine: Add support for the Analog Devices AXI-DMAC DMA controller") Signed-off-by: Nuno Sá base-commit: 398035178503bf662281bbffb4bebce1460a4bc5 change-id: 20251104-axi-dmac-fixes-and-improvs-e3ad512a329c Acked-by: Michael Hennerich Link: https://patch.msgid.link/20251104-axi-dmac-fixes-and-improvs-v1-1-3e6fd9328f72@analog.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- drivers/dma/dma-axi-dmac.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c index 4f426be286884..93e00130400df 100644 --- a/drivers/dma/dma-axi-dmac.c +++ b/drivers/dma/dma-axi-dmac.c @@ -225,6 +225,7 @@ static void axi_dmac_start_transfer(struct axi_dmac_chan *chan) return; list_move_tail(&vdesc->node, &chan->active_descs); desc = to_axi_dmac_desc(vdesc); + chan->next_desc = desc; } sg = &desc->sg[desc->num_submitted]; @@ -242,8 +243,6 @@ static void axi_dmac_start_transfer(struct axi_dmac_chan *chan) else chan->next_desc = NULL; flags |= AXI_DMAC_FLAG_LAST; - } else { - chan->next_desc = desc; } sg->id = axi_dmac_read(dmac, AXI_DMAC_REG_TRANSFER_ID); -- 2.51.0