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Tue, 8 Oct 2019 13:49:50 +0000 (GMT) From: k.konieczny@partner.samsung.com To: k.konieczny@partner.samsung.com Subject: [PATCH] devfreq: exynos-bus: workaround dev_pm_opp_set_rate() errors on Exynos5422/5800 SoCs Date: Tue, 8 Oct 2019 15:49:23 +0200 Message-Id: <20191008134923.30123-1-k.konieczny@partner.samsung.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrGKsWRmVeSWpSXmKPExsWy7djP87r/J8+JNdj/m99i44z1rBbXvzxn tejb95/Rov/xa2aL8+c3sFucbXrDbrHp8TVWi8u75rBZfO49wmgx4/w+Jou1R+6yW9xuXMHm wOOxaVUnm8fmJfUeB9/tYfLo27KK0ePzJrkA1igum5TUnMyy1CJ9uwSujFcHPjIXbBeqmDX1 IlMD40L+LkZODgkBE4kTK9YydzFycQgJrGCUmD77HBuE84VRYsbv/awQzmdGiedL77PAtDSt 3w6VWM4o8WXCa1a4lnv7JrKBVLEJqEpsmfGSHcQWEVCWmHxvOtgSZoENzBLdiw8zgiSEBdIl 3rzsYgKxWYAaVrxZwwxi8wq4SNxevg6omQNonbzE4UNZEGFBiZMzn4BdwQwUbt46G2ymhMB0 dokfpx6yQtS7SExvN4a4VFji1fEt7BC2jMTpyT1QH5RLPF3Yxw7R28Io8aD9I1TCWuLw8Ytg c5gFNCXW79KHCDtKvL1/mRFiPJ/EjbeCECfwSUzaBvIWSJhXoqNNCKJaVeL5qR4mCFtaouv/ OlYI20NiTe8qsGuEBGIl1j3qZJ/AqDALyWOzkDw2C+GGBYzMqxjFU0uLc9NTi43zUsv1ihNz i0vz0vWS83M3MQJT0+l/x7/uYNz3J+kQowAHoxIPr0PVnFgh1sSy4srcQ4wSHMxKIrxyS2fE CvGmJFZWpRblxxeV5qQWH2KU5mBREuetZngQLSSQnliSmp2aWpBaBJNl4uCUamBsvDa7utWM j9NV7tOqwx+CNU6vV90r+fvwlZjjynt5WLWs+UqkWSx/pi3mVS7udUisMN4+JfSG/J47C9dK fHnntEI199Gl6701O2dwtgfM5j2lrVLA7yimu/WHa5D45VXRUy56zP185ytDlOhhQQ0G950n hVr13tx8eN8+sreGJeva+gbNCxOVWIozEg21mIuKEwFek+OtSQMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuplkeLIzCtJLcpLzFFi42I5/e/4Pd1/k+fEGmz7YWSxccZ6VovrX56z WvTt+89o0f/4NbPF+fMb2C3ONr1ht9j0+BqrxeVdc9gsPvceYbSYcX4fk8XaI3fZLW43rmBz 4PHYtKqTzWPzknqPg+/2MHn0bVnF6PF5k1wAa5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJ pZ6hsXmslZGpkr6dTUpqTmZZapG+XYJexqsDH5kLtgtVzJp6kamBcSF/FyMnh4SAiUTT+u2s XYxcHEICSxkldh8+wwKRkJZoPL2aCcIWlvhzrYsNougTo8Tf639YQRJsAqoSW2a8ZAexRQSU JSbfm84MUsQssItZ4uny32AJYYFUiannjzOD2CxADSverAGzeQVcJG4vXwdUwwG0QV7i8KEs iLCgxMmZT8COYAYKN2+dzTyBkW8WktQsJKkFjEyrGEVSS4tz03OLDfWKE3OLS/PS9ZLzczcx AqNi27Gfm3cwXtoYfIhRgINRiYfXoWpOrBBrYllxZe4hRgkOZiURXrmlM2KFeFMSK6tSi/Lj i0pzUosPMZoC3TqRWUo0OR8YsXkl8YamhuYWlobmxubGZhZK4rwdAgdjhATSE0tSs1NTC1KL YPqYODilGhi1Ntx7bmh8t1464eSdXi4XGcV1m33MY2NFQlsMNs9M55aabaDsmNrGWebgu3Mm j7yOya3761/elZc39/2qFZc5yYeL5b748sfyF6cc9FKw3f3sCfNefrn6kt+pitFW+1ueVebn nP7rz6Fm4707sMrp0kKWwPMntE6tT1P9cK1GLUPnj8SVbiWW4oxEQy3mouJEAGOxeLKgAgAA X-CMS-MailID: 20191008134950eucas1p15cfef5800efc10d5b18ec5eb37dde60b X-Msg-Generator: CA X-RootMTR: 20191008134950eucas1p15cfef5800efc10d5b18ec5eb37dde60b X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20191008134950eucas1p15cfef5800efc10d5b18ec5eb37dde60b References: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191008_065000_798082_BA9EF899 X-CRM114-Status: GOOD ( 15.40 ) X-Spam-Score: -5.1 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-5.1 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.11 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record 0.0 SPF_NONE SPF: sender does not publish an SPF Record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, Bartlomiej Zolnierkiewicz , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski , Chanwoo Choi , Kyungmin Park , Kukjin Kim , MyungJoo Ham , linux-arm-kernel@lists.infradead.org, Marek Szyprowski Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Commit 4294a779bd8d ("PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()") introduced errors: exynos-bus: new bus device registered: soc:bus_wcore ( 84000 KHz ~ 400000 KHz) exynos-bus: new bus device registered: soc:bus_noc ( 67000 KHz ~ 100000 KHz) exynos-bus: new bus device registered: soc:bus_fsys_apb (100000 KHz ~ 200000 KHz) ... exynos-bus soc:bus_wcore: dev_pm_opp_set_rate: failed to find current OPP for freq 532000000 (-34) exynos-bus soc:bus_noc: dev_pm_opp_set_rate: failed to find current OPP for freq 111000000 (-34) exynos-bus soc:bus_fsys_apb: dev_pm_opp_set_rate: failed to find current OPP for freq 222000000 (-34) They are caused by incorrect PLL assigned to clock source, which results in clock rate outside of OPP range. Add workaround for this in exynos_bus_parse_of() by adjusting clock rate to those present in OPP. Fixes: 4294a779bd8d ("PM / devfreq: exynos-bus: Convert to use dev_pm_opp_set_rate()") Reported-by: Krzysztof Kozlowski Signed-off-by: Kamil Konieczny --- drivers/devfreq/exynos-bus.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c index c832673273a2..37bd34d5625b 100644 --- a/drivers/devfreq/exynos-bus.c +++ b/drivers/devfreq/exynos-bus.c @@ -243,7 +243,7 @@ static int exynos_bus_parse_of(struct device_node *np, { struct device *dev = bus->dev; struct dev_pm_opp *opp; - unsigned long rate; + unsigned long rate, opp_rate; int ret; /* Get the clock to provide each bus with source clock */ @@ -267,13 +267,21 @@ static int exynos_bus_parse_of(struct device_node *np, } rate = clk_get_rate(bus->clk); - - opp = devfreq_recommended_opp(dev, &rate, 0); + opp_rate = rate; + opp = devfreq_recommended_opp(dev, &opp_rate, 0); if (IS_ERR(opp)) { dev_err(dev, "failed to find dev_pm_opp\n"); ret = PTR_ERR(opp); goto err_opp; } + /* + * FIXME: U-boot leaves clock source at incorrect PLL, this results + * in clock rate outside defined OPP rate. Work around this bug by + * setting clock rate to recommended one. + */ + if (rate > opp_rate) + clk_set_rate(bus->clk, opp_rate); + bus->curr_freq = dev_pm_opp_get_freq(opp); dev_pm_opp_put(opp);