From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (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 483133B9600 for ; Mon, 4 May 2026 11:34:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777894463; cv=none; b=Dk4vT4Jq4hJw/lcI1Nm047drxxX1xJdrtlmo+3tHkcsLdWsuulBLK+V++W/U+jbXw7EK+phqUfe6phgAdsXstcf3DxjZSTCVTPCQnLs0wdUbnkC2DYP5QyEPMe2lhgaSihDUwKbkLAkFBjJcWNNowgE4gRx399np41JLmT9zqmk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777894463; c=relaxed/simple; bh=f86i4XDsGlrKjm0Br2d3/oiMsI6uFn13A5Ha901yOGw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NbS/14UNnS4laX+tZ1x+a8KTqvD8JKCjzrzoQhukH7MHWvJ1T5d656EihJ36xAbdTrB/W9HSaRXZWKYTsAXYtllLC0XfZS25CtjZ9o4vJLHNx7hrKZByKg80sbxkU9iz8GzUTYNUl/hWA9iy1dG2hxmu9Zqgq9YW9hZ0SrmZfNE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=hl+1tkJn; arc=none smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="hl+1tkJn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1777894461; x=1809430461; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=f86i4XDsGlrKjm0Br2d3/oiMsI6uFn13A5Ha901yOGw=; b=hl+1tkJn5Vvo6IXvU7sAQ49Lc3lwr66G8cQNug20QWYLmesQy7QDzeyR XnCGZdhdGBlsZLSMUHojZnOFfCxMLupG9umMJLOd09CqKjHIk6vb22j2p OBzt3/YFzQ2eWz+RHbcTQTTPDG5kMnFSrEuCbyblJguQWm2Y7qQDOfcvQ /arAil/q6lR2i7Vp3JaBdiuq52IKQu9bbBfeuJGq2x9s+M9WQV5m8SuMb ezPU/7hxHS7m+nwPQzFRbyTSsg1A2CwqBHQDG/ZLUapZG8o5+IHU20f6G sLLUAhf3RocFuUgDakHPdu5/QHt5V1LZLvLnoi5hxo1Crd1opV837JF2k A==; X-CSE-ConnectionGUID: 3NQkPgv8QN2yMjVg9Gsmww== X-CSE-MsgGUID: LdEXf+YoR8O6sMMFpH8g2Q== X-IronPort-AV: E=McAfee;i="6800,10657,11775"; a="81315215" X-IronPort-AV: E=Sophos;i="6.23,215,1770624000"; d="scan'208";a="81315215" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 May 2026 04:34:21 -0700 X-CSE-ConnectionGUID: /MlSrEC4SAGno5/F0ihhAA== X-CSE-MsgGUID: lxqSgeOAQSyJ7R23HxMF5w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,215,1770624000"; d="scan'208";a="240478277" Received: from hrotuna-mobl2.ger.corp.intel.com (HELO ahunter6-desk) ([10.245.245.92]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 May 2026 04:34:19 -0700 From: Adrian Hunter To: alexandre.belloni@bootlin.com Cc: Frank.Li@nxp.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH V3 10/16] i3c: mipi-i3c-hci: Add DMA ring abort quirk for Intel controllers Date: Mon, 4 May 2026 14:33:46 +0300 Message-ID: <20260504113352.38490-11-adrian.hunter@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260504113352.38490-1-adrian.hunter@intel.com> References: <20260504113352.38490-1-adrian.hunter@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Content-Transfer-Encoding: 8bit DMA rings can be aborted either per-ring via RING_CONTROL or globally via HC_CONTROL_ABORT. The driver currently relies on the per-ring mechanism. Some Intel I3C HCI controllers require HC_CONTROL_ABORT to be asserted before a DMA ring abort is effective. This behavior is non-standard. Introduce a controller quirk to select the required abort method and enable it for Intel LPSS I3C controllers. Signed-off-by: Adrian Hunter --- Changes in V2 and V3: None drivers/i3c/master/mipi-i3c-hci/core.c | 18 +++++++++++++++-- drivers/i3c/master/mipi-i3c-hci/dma.c | 27 +++++++++++++++++++++++--- drivers/i3c/master/mipi-i3c-hci/hci.h | 2 ++ 3 files changed, 42 insertions(+), 5 deletions(-) diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c index 770235ad6b25..8274c84b16be 100644 --- a/drivers/i3c/master/mipi-i3c-hci/core.c +++ b/drivers/i3c/master/mipi-i3c-hci/core.c @@ -231,7 +231,20 @@ static void i3c_hci_bus_cleanup(struct i3c_master_controller *m) void mipi_i3c_hci_resume(struct i3c_hci *hci) { - reg_set(HC_CONTROL, HC_CONTROL_RESUME); + u32 reg = reg_read(HC_CONTROL); + + reg |= HC_CONTROL_RESUME; + reg &= ~HC_CONTROL_ABORT; + reg_write(HC_CONTROL, reg); +} + +void mipi_i3c_hci_abort(struct i3c_hci *hci) +{ + u32 reg = reg_read(HC_CONTROL); + + reg &= ~HC_CONTROL_RESUME; /* Do not set resume */ + reg |= HC_CONTROL_ABORT; + reg_write(HC_CONTROL, reg); } /* located here rather than pio.c because needed bits are in core reg space */ @@ -1053,7 +1066,8 @@ static const struct platform_device_id i3c_hci_driver_ids[] = { { .name = "intel-lpss-i3c", HCI_QUIRK_RPM_ALLOWED | HCI_QUIRK_RPM_IBI_ALLOWED | HCI_QUIRK_RPM_PARENT_MANAGED | - HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET }, + HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET | + HCI_QUIRK_DMA_REQUIRES_HC_ABORT }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, i3c_hci_driver_ids); diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c index 699c6d523eed..41bbd912df7f 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dma.c +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c @@ -597,6 +597,29 @@ static void hci_dma_xfer_done(struct i3c_hci *hci, struct hci_rh_data *rh) rh_reg_write(RING_OPERATION1, op1_val); } +static bool hci_dma_requires_hc_abort_quirk(struct i3c_hci *hci, struct hci_rh_data *rh) +{ + if (!(hci->quirks & HCI_QUIRK_DMA_REQUIRES_HC_ABORT)) + return false; + + reinit_completion(&rh->op_done); + mipi_i3c_hci_abort(hci); + wait_for_completion_timeout(&rh->op_done, HZ); + rh_reg_write(RING_CONTROL, rh_reg_read(RING_CONTROL) | RING_CTRL_ABORT); + + return true; +} + +static void hci_dma_abort(struct i3c_hci *hci, struct hci_rh_data *rh) +{ + if (hci_dma_requires_hc_abort_quirk(hci, rh)) + return; + + reinit_completion(&rh->op_done); + rh_reg_write(RING_CONTROL, rh_reg_read(RING_CONTROL) | RING_CTRL_ABORT); + wait_for_completion_timeout(&rh->op_done, HZ); +} + static void hci_dma_abort_requires_pio_reset_quirk(struct i3c_hci *hci, struct hci_rh_data *rh) { if ((hci->quirks & HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET) && @@ -630,9 +653,7 @@ static bool hci_dma_dequeue_xfer(struct i3c_hci *hci, hci->enqueue_blocked = true; spin_unlock_irq(&hci->lock); /* stop the ring */ - reinit_completion(&rh->op_done); - rh_reg_write(RING_CONTROL, rh_reg_read(RING_CONTROL) | RING_CTRL_ABORT); - wait_for_completion_timeout(&rh->op_done, HZ); + hci_dma_abort(hci, rh); spin_lock_irq(&hci->lock); ring_status = rh_reg_read(RING_STATUS); if (ring_status & RING_STATUS_RUNNING) { diff --git a/drivers/i3c/master/mipi-i3c-hci/hci.h b/drivers/i3c/master/mipi-i3c-hci/hci.h index 01237b12d32e..97c31a315a6e 100644 --- a/drivers/i3c/master/mipi-i3c-hci/hci.h +++ b/drivers/i3c/master/mipi-i3c-hci/hci.h @@ -157,9 +157,11 @@ struct i3c_hci_dev_data { #define HCI_QUIRK_RPM_IBI_ALLOWED BIT(6) /* IBI and Hot-Join allowed while runtime suspended */ #define HCI_QUIRK_RPM_PARENT_MANAGED BIT(7) /* Runtime PM managed by parent device */ #define HCI_QUIRK_DMA_ABORT_REQUIRES_PIO_RESET BIT(8) /* Do PIO queue SW resets after DMA abort */ +#define HCI_QUIRK_DMA_REQUIRES_HC_ABORT BIT(9) /* Use HC_CONTROL ABORT to abort DMA */ /* global functions */ void mipi_i3c_hci_resume(struct i3c_hci *hci); +void mipi_i3c_hci_abort(struct i3c_hci *hci); void mipi_i3c_hci_pio_reset(struct i3c_hci *hci); void mipi_i3c_hci_pio_reset_all_queues(struct i3c_hci *hci); void mipi_i3c_hci_dct_index_reset(struct i3c_hci *hci); -- 2.51.0