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[91.78.208.152]) by smtp.googlemail.com with ESMTPSA id w5sm3843660ljj.47.2020.04.09.12.16.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Apr 2020 12:16:47 -0700 (PDT) Subject: Re: [PATCH v6 09/14] memory: tegra: Add EMC scaling support code for Tegra210 To: Thierry Reding , Rob Herring Cc: Jon Hunter , Michael Turquette , Stephen Boyd , Joseph Lo , linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20200409175238.3586487-1-thierry.reding@gmail.com> <20200409175238.3586487-10-thierry.reding@gmail.com> From: Dmitry Osipenko Message-ID: Date: Thu, 9 Apr 2020 22:16:46 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200409175238.3586487-10-thierry.reding@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org 09.04.2020 20:52, Thierry Reding пишет: ... > +static int tegra210_emc_set_rate(struct device *dev, > + const struct tegra210_clk_emc_config *config) > +{ > + struct tegra210_emc *emc = dev_get_drvdata(dev); > + struct tegra210_emc_timing *timing = NULL; > + unsigned long rate = config->rate; > + s64 last_change_delay; > + unsigned long flags; > + unsigned int i; > + > + if (rate == emc->last->rate * 1000UL) > + return 0; Couldn't all the rates be expressed in Hz? Then you won't need all these multiplications by 1000. > + for (i = 0; i < emc->num_timings; i++) { > + if (emc->timings[i].rate * 1000UL == rate) { > + timing = &emc->timings[i]; > + break; > + } > + } > + > + if (!timing) > + return -EINVAL; > + > + if (rate > 204000000 && !timing->trained) > + return -EINVAL; > + > + emc->next = timing; > + last_change_delay = ktime_us_delta(ktime_get(), emc->clkchange_time); > + > + /* XXX use non-busy-looping sleep? */ > + if ((last_change_delay >= 0) && > + (last_change_delay < emc->clkchange_delay)) > + udelay(emc->clkchange_delay - (int)last_change_delay); > + > + spin_lock_irqsave(&emc->lock, flags); > + tegra210_emc_set_clock(emc, config->value); > + emc->clkchange_time = ktime_get(); > + emc->last = timing; > + spin_unlock_irqrestore(&emc->lock, flags); > + > + return 0; > +} I'd suggest to check how much time invocation of ktime_get() takes, at least it came to a surprise to me in a case of the tegra-cpuidle driver. It may be well over the emc->clkchange_delay. ... > +static int tegra210_emc_probe(struct platform_device *pdev) > +{ ... > + emc->clkchange_delay = 100; > + emc->training_interval = 100; Not sure why these aren't a constant with the code.. ? From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: Re: [PATCH v6 09/14] memory: tegra: Add EMC scaling support code for Tegra210 Date: Thu, 9 Apr 2020 22:16:46 +0300 Message-ID: References: <20200409175238.3586487-1-thierry.reding@gmail.com> <20200409175238.3586487-10-thierry.reding@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200409175238.3586487-10-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Content-Language: en-US Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Thierry Reding , Rob Herring Cc: Jon Hunter , Michael Turquette , Stephen Boyd , Joseph Lo , linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: linux-tegra@vger.kernel.org 09.04.2020 20:52, Thierry Reding пишет: ... > +static int tegra210_emc_set_rate(struct device *dev, > + const struct tegra210_clk_emc_config *config) > +{ > + struct tegra210_emc *emc = dev_get_drvdata(dev); > + struct tegra210_emc_timing *timing = NULL; > + unsigned long rate = config->rate; > + s64 last_change_delay; > + unsigned long flags; > + unsigned int i; > + > + if (rate == emc->last->rate * 1000UL) > + return 0; Couldn't all the rates be expressed in Hz? Then you won't need all these multiplications by 1000. > + for (i = 0; i < emc->num_timings; i++) { > + if (emc->timings[i].rate * 1000UL == rate) { > + timing = &emc->timings[i]; > + break; > + } > + } > + > + if (!timing) > + return -EINVAL; > + > + if (rate > 204000000 && !timing->trained) > + return -EINVAL; > + > + emc->next = timing; > + last_change_delay = ktime_us_delta(ktime_get(), emc->clkchange_time); > + > + /* XXX use non-busy-looping sleep? */ > + if ((last_change_delay >= 0) && > + (last_change_delay < emc->clkchange_delay)) > + udelay(emc->clkchange_delay - (int)last_change_delay); > + > + spin_lock_irqsave(&emc->lock, flags); > + tegra210_emc_set_clock(emc, config->value); > + emc->clkchange_time = ktime_get(); > + emc->last = timing; > + spin_unlock_irqrestore(&emc->lock, flags); > + > + return 0; > +} I'd suggest to check how much time invocation of ktime_get() takes, at least it came to a surprise to me in a case of the tegra-cpuidle driver. It may be well over the emc->clkchange_delay. ... > +static int tegra210_emc_probe(struct platform_device *pdev) > +{ ... > + emc->clkchange_delay = 100; > + emc->training_interval = 100; Not sure why these aren't a constant with the code.. ? 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[91.78.208.152]) by smtp.googlemail.com with ESMTPSA id w5sm3843660ljj.47.2020.04.09.12.16.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Apr 2020 12:16:47 -0700 (PDT) Subject: Re: [PATCH v6 09/14] memory: tegra: Add EMC scaling support code for Tegra210 To: Thierry Reding , Rob Herring References: <20200409175238.3586487-1-thierry.reding@gmail.com> <20200409175238.3586487-10-thierry.reding@gmail.com> From: Dmitry Osipenko Message-ID: Date: Thu, 9 Apr 2020 22:16:46 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200409175238.3586487-10-thierry.reding@gmail.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200409_121650_736117_BE90C3EC X-CRM114-Status: GOOD ( 14.46 ) 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: devicetree@vger.kernel.org, Stephen Boyd , Michael Turquette , Jon Hunter , Joseph Lo , linux-tegra@vger.kernel.org, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org MDkuMDQuMjAyMCAyMDo1MiwgVGhpZXJyeSBSZWRpbmcg0L/QuNGI0LXRgjoKLi4uCj4gK3N0YXRp YyBpbnQgdGVncmEyMTBfZW1jX3NldF9yYXRlKHN0cnVjdCBkZXZpY2UgKmRldiwKPiArCQkJCSBj b25zdCBzdHJ1Y3QgdGVncmEyMTBfY2xrX2VtY19jb25maWcgKmNvbmZpZykKPiArewo+ICsJc3Ry dWN0IHRlZ3JhMjEwX2VtYyAqZW1jID0gZGV2X2dldF9kcnZkYXRhKGRldik7Cj4gKwlzdHJ1Y3Qg dGVncmEyMTBfZW1jX3RpbWluZyAqdGltaW5nID0gTlVMTDsKPiArCXVuc2lnbmVkIGxvbmcgcmF0 ZSA9IGNvbmZpZy0+cmF0ZTsKPiArCXM2NCBsYXN0X2NoYW5nZV9kZWxheTsKPiArCXVuc2lnbmVk IGxvbmcgZmxhZ3M7Cj4gKwl1bnNpZ25lZCBpbnQgaTsKPiArCj4gKwlpZiAocmF0ZSA9PSBlbWMt Pmxhc3QtPnJhdGUgKiAxMDAwVUwpCj4gKwkJcmV0dXJuIDA7CgpDb3VsZG4ndCBhbGwgdGhlIHJh dGVzIGJlIGV4cHJlc3NlZCBpbiBIej8gVGhlbiB5b3Ugd29uJ3QgbmVlZCBhbGwgdGhlc2UKbXVs dGlwbGljYXRpb25zIGJ5IDEwMDAuCgo+ICsJZm9yIChpID0gMDsgaSA8IGVtYy0+bnVtX3RpbWlu Z3M7IGkrKykgewo+ICsJCWlmIChlbWMtPnRpbWluZ3NbaV0ucmF0ZSAqIDEwMDBVTCA9PSByYXRl KSB7Cj4gKwkJCXRpbWluZyA9ICZlbWMtPnRpbWluZ3NbaV07Cj4gKwkJCWJyZWFrOwo+ICsJCX0K PiArCX0KPiArCj4gKwlpZiAoIXRpbWluZykKPiArCQlyZXR1cm4gLUVJTlZBTDsKPiArCj4gKwlp ZiAocmF0ZSA+IDIwNDAwMDAwMCAmJiAhdGltaW5nLT50cmFpbmVkKQo+ICsJCXJldHVybiAtRUlO VkFMOwo+ICsKPiArCWVtYy0+bmV4dCA9IHRpbWluZzsKPiArCWxhc3RfY2hhbmdlX2RlbGF5ID0g a3RpbWVfdXNfZGVsdGEoa3RpbWVfZ2V0KCksIGVtYy0+Y2xrY2hhbmdlX3RpbWUpOwo+ICsKPiAr CS8qIFhYWCB1c2Ugbm9uLWJ1c3ktbG9vcGluZyBzbGVlcD8gKi8KPiArCWlmICgobGFzdF9jaGFu Z2VfZGVsYXkgPj0gMCkgJiYKPiArCSAgICAobGFzdF9jaGFuZ2VfZGVsYXkgPCBlbWMtPmNsa2No YW5nZV9kZWxheSkpCj4gKwkJdWRlbGF5KGVtYy0+Y2xrY2hhbmdlX2RlbGF5IC0gKGludClsYXN0 X2NoYW5nZV9kZWxheSk7Cj4gKwo+ICsJc3Bpbl9sb2NrX2lycXNhdmUoJmVtYy0+bG9jaywgZmxh Z3MpOwo+ICsJdGVncmEyMTBfZW1jX3NldF9jbG9jayhlbWMsIGNvbmZpZy0+dmFsdWUpOwo+ICsJ ZW1jLT5jbGtjaGFuZ2VfdGltZSA9IGt0aW1lX2dldCgpOwo+ICsJZW1jLT5sYXN0ID0gdGltaW5n Owo+ICsJc3Bpbl91bmxvY2tfaXJxcmVzdG9yZSgmZW1jLT5sb2NrLCBmbGFncyk7Cj4gKwo+ICsJ cmV0dXJuIDA7Cj4gK30KCkknZCBzdWdnZXN0IHRvIGNoZWNrIGhvdyBtdWNoIHRpbWUgaW52b2Nh dGlvbiBvZiBrdGltZV9nZXQoKSB0YWtlcywgYXQKbGVhc3QgaXQgY2FtZSB0byBhIHN1cnByaXNl IHRvIG1lIGluIGEgY2FzZSBvZiB0aGUgdGVncmEtY3B1aWRsZSBkcml2ZXIuCgpJdCBtYXkgYmUg d2VsbCBvdmVyIHRoZSBlbWMtPmNsa2NoYW5nZV9kZWxheS4KCi4uLgo+ICtzdGF0aWMgaW50IHRl Z3JhMjEwX2VtY19wcm9iZShzdHJ1Y3QgcGxhdGZvcm1fZGV2aWNlICpwZGV2KQo+ICt7Ci4uLgo+ ICsJZW1jLT5jbGtjaGFuZ2VfZGVsYXkgPSAxMDA7Cj4gKwllbWMtPnRyYWluaW5nX2ludGVydmFs ID0gMTAwOwoKTm90IHN1cmUgd2h5IHRoZXNlIGFyZW4ndCBhIGNvbnN0YW50IHdpdGggdGhlIGNv ZGUuLiA/CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwps aW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmluZnJh ZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51 eC1hcm0ta2VybmVsCg==