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[109.252.192.57]) by smtp.googlemail.com with ESMTPSA id z9sm892667lfs.183.2021.01.15.05.02.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 15 Jan 2021 05:02:51 -0800 (PST) Subject: Re: [PATCH v1 5/5] ASoC: tegra: ahub: Reset hardware properly From: Dmitry Osipenko To: Thierry Reding , Jonathan Hunter , Sameer Pujar , Peter Geis , Nicolas Chauvet , Takashi Iwai , Jaroslav Kysela Cc: alsa-devel@alsa-project.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210112125834.21545-1-digetx@gmail.com> <20210112125834.21545-6-digetx@gmail.com> Message-ID: <5d99eba8-a169-1dc1-c7ab-0734c67c50b7@gmail.com> Date: Fri, 15 Jan 2021 16:02:50 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.2 MIME-Version: 1.0 In-Reply-To: <20210112125834.21545-6-digetx@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org 12.01.2021 15:58, Dmitry Osipenko пишет: > Assert hardware reset before clocks are enabled and then de-assert it > after clocks are enabled. This brings hardware into a predictable state > and removes relying on implicit de-assertion of resets which is done by > the clk driver. > > Tested-by: Peter Geis > Tested-by: Nicolas Chauvet > Signed-off-by: Dmitry Osipenko > --- > sound/soc/tegra/tegra30_ahub.c | 33 ++++++++++++++++----------------- > sound/soc/tegra/tegra30_ahub.h | 1 + > 2 files changed, 17 insertions(+), 17 deletions(-) > > diff --git a/sound/soc/tegra/tegra30_ahub.c b/sound/soc/tegra/tegra30_ahub.c > index 4dbb58f7ea36..246cf6a373a1 100644 > --- a/sound/soc/tegra/tegra30_ahub.c > +++ b/sound/soc/tegra/tegra30_ahub.c > @@ -65,10 +65,20 @@ static int tegra30_ahub_runtime_resume(struct device *dev) > { > int ret; > > + ret = reset_control_assert(ahub->reset); > + if (ret) > + return ret; > + > ret = clk_bulk_prepare_enable(ahub->nclocks, ahub->clocks); > if (ret) > return ret; > > + ret = reset_control_reset(ahub->reset); > + if (ret) { > + clk_bulk_disable_unprepare(ahub->nclocks, ahub->clocks); > + return ret; > + } > + > regcache_cache_only(ahub->regmap_apbif, false); > regcache_cache_only(ahub->regmap_ahub, false); I just realized that this is incorrect version of the patch which misses the regcache syncing after the h/w reset. I'll make a v2.