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 118283D9530; Sun, 20 Sep 2026 18:59:42 +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=1789930784; cv=none; b=TcNOMfPyR7Uvkob2QuH3JC61WzjBVSNdzE54d5MLYMrN8djTJylOax+8VlJq1pM2yDWkDFUIoMQqmsA/yEy9JVnq32J+bkyav05ItZNuPN3zhddCdppXRJrap2QY5u/FkZXkczIprcLctCc+bR7psgGLxkZgsp3NVaNVnjuLDlM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789930784; c=relaxed/simple; bh=5T2JuCoEjvT2i1bEQ3lAjIr6LHhdr0fQM4f0adaQqeo=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=gdCRoX2IsmNHRnn9tIf0XOJgxi5SxexLIkTYOT1Op3pCYrGSTTqzHYL+hQMP0DYwxExumNLz92jPmYQif1hPHQzL8UD9eonFEm/uKZDFQE7MkxDurG7Ip79Eubm3aIm4rLMTpP5sfkrC02iD+5qTPt132clXdu4uaCUiZkBFtIM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=A/yJCkCr; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="A/yJCkCr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1BDCF1F000FF; Sun, 20 Sep 2026 18:59:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789930782; bh=4jo6oSI/cRH1PvcJhRkb6F8Ip/fLZjuNS44+h04S6EE=; h=From:Subject:Date:To:Cc; b=A/yJCkCr3XLa9B2TEOW3t3PHy2PJF4pA0Gcn6jEshi6SzszSduAt3Hu8c8WPXCHU3 QF96bgRAhJBN3jAMLPPwWPr83fqgx1vypHzBRvaQ9WxosL6yUlOlZfPBAFJHnAYQ6p rzKyTxQJoFXe91UTME0ylpszlZ7Jm70VXYBTby8YC+ykw2Ifx0bywDt631stscrmL4 OyIQgYhDsnbcfqiGkkfFb5IpWPyWyIaRPVHv64KxPU8BLYpVH3T1S8BwO91G+3DrmV 79fEzhAVXUwPfcepiy64MdAaVmoyeUQ9cxFJZdI808vAD02ePTZtxGlWgnsLpIqbeA aHio68/XzXg8w== From: Linus Walleij Subject: [PATCH v5 00/23] dmaengine: ste_dma40: Fix numerous accumulated bugs Date: Sun, 20 Sep 2026 20:59:35 +0200 Message-Id: <20260920-dma40-fixes-v5-0-5c55cd7f92f9@kernel.org> Precedence: bulk X-Mailing-List: dmaengine@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/33NTQ6CMBAF4KuYrq2ZTn9oXXkP4wLooI0KpjVEQ 7i71Y0ixuV7k+/NwBLFQImtFwOL1IcUujYHvVyw+lC2e+LB58wQ0IBF4P5cKuBNuFHilXNlYww AVg3L4hLpdchgu8v5ENK1i/fXeC+e7e+dXnDgmoSyQpfeWLc5UmzptOrinj2HevyDMWMjUVopV V1AMcPyjZ2wUywztt5bpcEYR3aG1Qf+/qwy9oUWFXpXo2wmeBzHB34wYh1eAQAA X-Change-ID: 20260820-dma40-fixes-b99af66002bf To: Vinod Koul , Frank Li Cc: dmaengine@vger.kernel.org, phone-devel@vger.kernel.org, Linus Walleij , Frank Li , sashiko-bot@kernel.org X-Mailer: b4 0.14.3 This series fixes 26 DMA40 bugs. 12 were found while reviewing the Ux500 LCLA SRAM power-domain conversion. The cyclic transfer residue bug was exposed by Ux500 audio playback. 13 more issues were identified during review and hardware-manual audit. The method taken is: whenever Sashiko complains: fix the bug it complains about if possible. This has been boot tested on the Samsung Skomer device: DMA for MMC, wireless SDIO and UART still works after these patches, and DMA for audio started working. Assisted-by: LLM Signed-off-by: Linus Walleij --- Changes in v5: - Respin to fix some further corner cases found by Sashiko as well as can be done. - Resynchronize cyclic callback tracking after failed hardware-pointer samples and limit unchanged-pointer interrupts to one callback. DMA40 has only one latched terminal-count bit, so extra periods coalesced while the pointer is unavailable and exact one-or-more full-buffer laps cannot be recovered without risking spurious callbacks. - Count DMA40 status from channels owned by other SoC cores as handled without acknowledging it, so only status-less interrupts return IRQ_NONE and foreign DMA traffic cannot trigger spurious-IRQ disabling. This is REALLY FRINGE but let's do our best anyway! - Link to v4: https://lore.kernel.org/r/20260920-dma40-fixes-v4-0-d751b2d9c23f@kernel.org Changes in v4: - Rework cyclic-transfer residue reporting to use the current memory-side hardware pointer and reject periods that need more than one LLI. - Add cyclic callback recovery when terminal-count interrupts coalesce. - Retire all issued descriptors and release software channel state when a runtime PM resume fails, while avoiding inaccessible hardware registers. - Validate physical event IDs against the variant event-group limit rather than the physical channel count, as confirmed by the DB8500 manual. - Link to v3: https://lore.kernel.org/r/20260918-dma40-fixes-v3-0-8dd8450669e8@kernel.org Changes in v3: - Add a fix so physical channels advertise their existing cyclic support. - Add a cyclic-transfer residue fix so DMAengine PCM reports the correct hardware pointer and Ux500 audio playback does not stop with -EIO. - In patch 3, preserve cookie completion order when the next queued transfer fails to start and retire failed cyclic descriptors. - In patch 4, enable runtime PM before requesting the IRQ so pending interrupts can be acknowledged during probe. - In patch 5, keep valid interrupt handling with CONFIG_PM disabled and only drop a runtime PM reference when one was acquired. - Add checked runtime PM resume handling to channel operations. - Add an IRQ status patch returning IRQ_NONE when no DMA40 interrupt was acknowledged. - In patch 8, keep the IRQ disabled until hardware initialization has configured and cleared the DMA40 interrupt state. - In the DMA registration unwind patch, free the IRQ before unregistering the DMA devices and drain initialized tasklets before releasing storage. - Add a fix releasing the LCPA SRAM node reference after reading it. - Move the disabled-channels binding restoration to its own series. - Store memcpy channel mappings per controller and check the property read. - Add validation for disabled physical channel indexes. - Reject DMA specifiers that do not contain exactly three cells. - Reject transfer direction changes after channel allocation so logical channel resource masks are released correctly. - In the event-group bounds patch, use variant-specific limits so DB8540 event group 4 remains available. - Add fixed-channel fixes that search later physical blocks and validate configured physical channel indexes. - Move the generic DMAengine debugfs naming fix to its own series. - Use `Assisted-by: LLM` for the existing assistance trailers. - Rebase onto v7.3-rc1. - Link to v2: https://lore.kernel.org/r/20260820-dma40-fixes-v2-0-63238334c707@kernel.org Changes in v2: - In patch 1, complete the failed-start descriptor through the normal tasklet path and drop the runtime PM reference instead of freeing the submitted descriptor directly. - Add an IRQ fix to avoid register access when DMA40 is runtime suspended. - Add a probe ordering fix so DMA40 hardware is initialized before DMAengine devices are registered. - Add a probe unwind fix so DMAengine registrations are released before freeing IRQ and LCLA resources. - Add an LCLA allocation fix so __get_free_pages() and free_pages() use an allocation order instead of a raw page count. - Add a probe unwind fix so ESRAM LCLA mappings are not released with free_pages(). - Add a device tree parsing fix so memcpy-channels cannot overflow the memcpy channel array. - Add a dev_type bounds fix so derived event groups cannot overflow phy_res or the priority/realtime register window. - Add validation for fallback memcpy configurations so memcpy-channels entries cannot bypass the dev_type bounds checks. - Add a DMAengine debugfs naming fix so drivers registering several DMAengine devices for one parent device do not trigger duplicate-name warnings. - Link to v1: https://lore.kernel.org/r/20260820-dma40-fixes-v1-0-5e14815ad689@kernel.org --- Linus Walleij (23): dmaengine: ste_dma40: Fix physical cyclic capability dmaengine: ste_dma40: Fix cyclic transfer residue dmaengine: ste_dma40: Recover coalesced cyclic callbacks dmaengine: ste_dma40: Fix failed start cleanup dmaengine: ste_dma40: Fix probe runtime PM disable dmaengine: ste_dma40: Check runtime PM in IRQ dmaengine: ste_dma40: Handle runtime PM resume errors dmaengine: ste_dma40: Return IRQ_NONE without interrupt status dmaengine: ste_dma40: Init hardware before registration dmaengine: ste_dma40: Fix probe IRQ leak dmaengine: ste_dma40: Fix DMA registration unwind dmaengine: ste_dma40: Fix LCLA allocation order dmaengine: ste_dma40: Fix probe LCLA free dmaengine: ste_dma40: Put the LCPA SRAM node dmaengine: ste_dma40: Fix memcpy channel parsing dmaengine: ste_dma40: Validate disabled channel indexes dmaengine: ste_dma40: Validate DMA specifier length dmaengine: ste_dma40: Reject direction changes after allocation dmaengine: ste_dma40: Fix logical channel bounds check dmaengine: ste_dma40: Fix event group bounds dmaengine: ste_dma40: Search all blocks for fixed logical channels dmaengine: ste_dma40: Validate fixed physical channel indexes dmaengine: ste_dma40: Validate memcpy configuration drivers/dma/ste_dma40.c | 537 +++++++++++++++++++++++++++++++++++++----------- 1 file changed, 419 insertions(+), 118 deletions(-) --- base-commit: cee9395acd8043be0644b25c34bfa86623f2b935 change-id: 20260820-dma40-fixes-b99af66002bf Best regards, -- Linus Walleij