From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9617CC388F9 for ; Wed, 21 Oct 2020 15:27:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 113EE20797 for ; Wed, 21 Oct 2020 15:27:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="m0wGNSiw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2502432AbgJUP1Y (ORCPT ); Wed, 21 Oct 2020 11:27:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2502395AbgJUP1Y (ORCPT ); Wed, 21 Oct 2020 11:27:24 -0400 Received: from mail-pg1-x543.google.com (mail-pg1-x543.google.com [IPv6:2607:f8b0:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4CE0BC0613CF for ; Wed, 21 Oct 2020 08:27:24 -0700 (PDT) Received: by mail-pg1-x543.google.com with SMTP id b23so1681754pgb.3 for ; Wed, 21 Oct 2020 08:27:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=L0DyEDqEHeJR1moGuOVmLacKQmOwrn/cXuF3+kACtMg=; b=m0wGNSiwupmw9UwVvZ+0B+ayFCqGEyq1r4XCx9hzNoBOf+6ZIMl9GdfVITZtXe5+FY brYY2u6xK6d5fc7Psk/dfJoYwKEzi1z8SWg1qWeyHViOjti9AE7BZFQP89fGYJvRaSJ+ rZCiiBe9mqWn4RXOvZ1bjOs41GDTNTYM+nPFPlxflXdXnVxRoU6BVUUUGumhj1CrGVR7 lKDk3BSaqMCaUJNkpp9UH72R7LAqIMrCibR+UNgx79qjsj5iiaIHc/bEBDvVxbQJokMl 8JsiWAFI4PTl5HBzL07EJi2FnqBL/dGyKKYjBcBgtedEp8MrH8CbM729AzTHk/f0U7Ct UuGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=L0DyEDqEHeJR1moGuOVmLacKQmOwrn/cXuF3+kACtMg=; b=dXb8FacSEZli0BiYLMw9ZU5J+iYA/UWM+GwsBEHMUdia4AbHQTiaYigKckj1TW8Cn2 RJGznZE1C1N6pqBWUMJInfWyGjv669pu0qvCOIRjac4BqT3W3cOWl3o2kTchUG4+JaAp qlEa0M6OZDWc1Jk08TjPUZpY6aoD83mayMWHB+7kdbTSM91Svxt1ysgMZcdcPk+0SqDh K6dpdRlXatDXY1mT7QZ0FI/FkP1gjI19SCVj/kWpL6wn7VgbDerUcVzpyYV7FD2wvruy oJ5l4VrAxssAh4MeUjyK7UsZpNRkQOPS83u4tvh671FR7/TRT2Vgic4oPGTSgMWD+FpB gpow== X-Gm-Message-State: AOAM5322sESU6vN+ezJg8JC5C2ObR8MJOtSzarcjf1PI+z5gQVJ3CnGO NSzgJwrcHW2l24DM9VZX7wDc X-Google-Smtp-Source: ABdhPJwsQnmOXwRt8AFibJECYq7E1vSXfA76igMIGe3bl5LxN3HOlUN3z5+vhpEa7F/zNDoO5fC9eg== X-Received: by 2002:a62:7a0a:0:b029:152:192d:9231 with SMTP id v10-20020a627a0a0000b0290152192d9231mr4087432pfc.61.1603294043706; Wed, 21 Oct 2020 08:27:23 -0700 (PDT) Received: from Mani-XPS-13-9360 ([2409:4072:70e:2a27:314a:6d22:ec47:a603]) by smtp.gmail.com with ESMTPSA id v24sm1092088pgi.91.2020.10.21.08.27.17 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Wed, 21 Oct 2020 08:27:22 -0700 (PDT) Date: Wed, 21 Oct 2020 20:57:14 +0530 From: Manivannan Sadhasivam To: Hemant Kumar Cc: gregkh@linuxfoundation.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, jhugo@codeaurora.org, bbhatt@codeaurora.org, loic.poulain@linaro.org Subject: Re: [PATCH v7 1/4] bus: mhi: core: Add helper API to return number of free TREs Message-ID: <20201021152714.GD3334@Mani-XPS-13-9360> References: <1602907457-13680-1-git-send-email-hemantk@codeaurora.org> <1602907457-13680-2-git-send-email-hemantk@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1602907457-13680-2-git-send-email-hemantk@codeaurora.org> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On Fri, Oct 16, 2020 at 09:04:14PM -0700, Hemant Kumar wrote: > 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 Thanks, Mani > --- > drivers/bus/mhi/core/main.c | 12 ++++++++++++ > include/linux/mhi.h | 9 +++++++++ > 2 files changed, 21 insertions(+) > > diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c > index 2cff5dd..3950792 100644 > --- a/drivers/bus/mhi/core/main.c > +++ b/drivers/bus/mhi/core/main.c > @@ -258,6 +258,18 @@ 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 d4841e5..7829b1d 100644 > --- a/include/linux/mhi.h > +++ b/include/linux/mhi.h > @@ -597,6 +597,15 @@ 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 > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project >