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[23.128.96.18]) by mx.google.com with ESMTP id pw18si69209ejb.163.2021.01.11.10.00.49; Mon, 11 Jan 2021 10:00:49 -0800 (PST) Received-SPF: pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="I/AKHGG3"; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390088AbhAKSAs (ORCPT + 7 others); Mon, 11 Jan 2021 13:00:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389642AbhAKSAr (ORCPT ); Mon, 11 Jan 2021 13:00:47 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52187C061794 for ; Mon, 11 Jan 2021 10:00:07 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id 91so694974wrj.7 for ; Mon, 11 Jan 2021 10:00:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=i5vkZMIp6m8L5GT9AIEfOu/P1P8j2pgSz4aGREmv2dc=; b=I/AKHGG3HMoRNy9lYcu3nJW8P7K50NkFE3b0sIJR4X1p8WYUTccsLtiyI0q81OljfG /Ejv1bmW1NNaPlUdEzB5SS4Xz0th4TlfipWApn2JyVw0ppDEmVpVAFyk3n3/6CjK96If cpgLvyCfMcQSGUUgQLqZKZjC00no64RfBbpdPs2Os/bNpB3M+HwF2hb6xEz/lrZQjytg Ryg5pOBQZ4cXDp2Vo7+M3qpVIO6HjpUWebrG9MR0meOhjcgFpCGB7jO+jot1bqfIgVuF ebXeYOhdRHmKN7mucpPo2msHkd95Hd38u5js9ulbMtmjSq4JgPZNE4pOu1P1LOfWXK/1 gWLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=i5vkZMIp6m8L5GT9AIEfOu/P1P8j2pgSz4aGREmv2dc=; b=RZuFwFjmz1OYLa8ySgPiG7soiTc9ZMCLaiASVovlMZVqEZpQqekIJyLMZFdjQ9VPhC cEnk2Xg8r3rwfmqslsNFkEdqIcDLlMk0+aDwDvFeV79gHoSspbQK9aoKg8mHVfiUKrHQ XlyFK568jqHf93dOiShtwpmkdg87mhUA8fKLdHK8VrGvnH4RGWqhFzZrUCVqpn/nSrML Jo0kjikquSvT24PZ1iXYxtJkF58PAOvYa2aNADGXGffZfCtv0xXzAit61Lc+fDxc/Jyb kluhAQHyixaPbutwwAqliIqB6lYoBqh3WGeWTHuUE72hsvIJ5XdO8R0G/zYOfhnT+YGH h1Jw== X-Gm-Message-State: AOAM5339sxUuMHwlosuHXJlKYTFe7v5jtGJ9kYWeTbhd+P5A0OyEP8o3 r8kKiMwjeA0bKcW8mnkxZrLeFtFcqvkjSQ== X-Received: by 2002:adf:d085:: with SMTP id y5mr317551wrh.41.1610388006052; Mon, 11 Jan 2021 10:00:06 -0800 (PST) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id s12sm77662wmh.29.2021.01.11.10.00.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Jan 2021 10:00:05 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net Cc: netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, manivannan.sadhasivam@linaro.org, Hemant Kumar Subject: [PATCH net-next 1/3] bus: mhi: core: Add helper API to return number of free TREs Date: Mon, 11 Jan 2021 19:07:40 +0100 Message-Id: <1610388462-16322-1-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Hemant Kumar Introduce mhi_get_free_desc_count() API to return number of TREs available to queue buffer. MHI clients can use this API to know before hand if ring is full without calling queue API. Signed-off-by: Hemant Kumar Reviewed-by: Jeffrey Hugo Reviewed-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/main.c | 12 ++++++++++++ include/linux/mhi.h | 9 +++++++++ 2 files changed, 21 insertions(+) -- 2.7.4 diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 3db1108..4e31f4f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -309,6 +309,18 @@ int mhi_destroy_device(struct device *dev, void *data) return 0; } +int mhi_get_free_desc_count(struct mhi_device *mhi_dev, + enum dma_data_direction dir) +{ + struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; + struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ? + mhi_dev->ul_chan : mhi_dev->dl_chan; + struct mhi_ring *tre_ring = &mhi_chan->tre_ring; + + return get_nr_avail_ring_elements(mhi_cntrl, tre_ring); +} +EXPORT_SYMBOL_GPL(mhi_get_free_desc_count); + void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason) { struct mhi_driver *mhi_drv; diff --git a/include/linux/mhi.h b/include/linux/mhi.h index cd571ad..62da830 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -614,6 +614,15 @@ void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl, void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason); /** + * mhi_get_free_desc_count - Get transfer ring length + * Get # of TD available to queue buffers + * @mhi_dev: Device associated with the channels + * @dir: Direction of the channel + */ +int mhi_get_free_desc_count(struct mhi_device *mhi_dev, + enum dma_data_direction dir); + +/** * mhi_prepare_for_power_up - Do pre-initialization before power up. * This is optional, call this before power up if * the controller does not want bus framework to