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=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 EC88DC3A5A8 for ; Wed, 4 Sep 2019 07:14:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C04542339E for ; Wed, 4 Sep 2019 07:14:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567581267; bh=NNC+RkkJ+eyITyoMs4o1gFL0TAFukDFGUWCl2aimc18=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=kepvgla9uzTWUACdkj7nwhSvaXyl5X/645BKkSrTpiBXzv6YNXd7HXtdiUqnxan2I 4y+l2ulrYP4zRCgmQjLltNo/xL299xFW9lzRLJQyv3s7klcPpOIAPrntI9ltubC6dP 1+hqyOWP64OOXHnroRRo4Qe4Uw48wEUXfIjyCuOg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728986AbfIDHO0 (ORCPT ); Wed, 4 Sep 2019 03:14:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:33552 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725938AbfIDHO0 (ORCPT ); Wed, 4 Sep 2019 03:14:26 -0400 Received: from localhost (unknown [122.182.201.156]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A3A6D22CEA; Wed, 4 Sep 2019 07:14:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567581265; bh=NNC+RkkJ+eyITyoMs4o1gFL0TAFukDFGUWCl2aimc18=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XhBTLeuw97W8DprCY1IMVU6AdWo9PaTC7PJNuXO6HzMcs8KiXB+r/kBYAe39/5zir sPdcD6rlDeUxYQxDEk+mwM/j6EEXXjljTJX8YSfpZNvbLVdpcinoL2U9CQkPLszhz3 VuVt9dCMUtswZmUlmQ428EVv4SMmMXfeV75K8qCk= Date: Wed, 4 Sep 2019 12:43:17 +0530 From: Vinod Koul To: Pierre-Louis Bossart Cc: alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, tiwai@suse.de, broonie@kernel.org, gregkh@linuxfoundation.org, jank@cadence.com, srinivas.kandagatla@linaro.org, slawomir.blauciak@intel.com, Sanyog Kale Subject: Re: [PATCH 2/6] soundwire: cadence_master: add hw_reset capability in debugfs Message-ID: <20190904071317.GJ2672@vkoul-mobl> References: <20190813213227.5163-1-pierre-louis.bossart@linux.intel.com> <20190813213227.5163-3-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190813213227.5163-3-pierre-louis.bossart@linux.intel.com> User-Agent: Mutt/1.12.0 (2019-05-25) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 13-08-19, 16:32, Pierre-Louis Bossart wrote: > Provide debugfs capability to kick link and devices into hard-reset > (as defined by MIPI). This capability is really useful when some > devices are no longer responsive and/or to check the software handling > of resynchronization. > > Signed-off-by: Pierre-Louis Bossart > --- > drivers/soundwire/cadence_master.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c > index 046622e4b264..bd58d80ff636 100644 > --- a/drivers/soundwire/cadence_master.c > +++ b/drivers/soundwire/cadence_master.c > @@ -340,6 +340,23 @@ static int cdns_reg_show(struct seq_file *s, void *data) > } > DEFINE_SHOW_ATTRIBUTE(cdns_reg); > > +static int cdns_hw_reset(void *data, u64 value) > +{ > + struct sdw_cdns *cdns = data; > + int ret; > + > + if (value != 1) > + return 0; Should this not be EINVAL to indicate invalid value passed? > + > + ret = sdw_cdns_exit_reset(cdns); > + > + dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret); > + > + return ret; > +} > + > +DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n"); > + > /** > * sdw_cdns_debugfs_init() - Cadence debugfs init > * @cdns: Cadence instance > @@ -348,6 +365,9 @@ DEFINE_SHOW_ATTRIBUTE(cdns_reg); > void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root) > { > debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops); > + > + debugfs_create_file("cdns-hw-reset", 0200, root, cdns, > + &cdns_hw_reset_fops); > } > EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init); > > -- > 2.20.1 -- ~Vinod