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Fri, 16 Jul 2021 17:53:57 +0800 Message-ID: <1626429237.29703.16.camel@mhfsdcap03> Subject: Re: [PATCH 8/8] i2c: mediatek: modify bus speed calculation formula From: Kewei Xu To: Tzung-Bi Shih CC: , , , , , , , , , , , , Date: Fri, 16 Jul 2021 17:53:57 +0800 In-Reply-To: References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> <1626316157-24935-9-git-send-email-kewei.xu@mediatek.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 6F46C422B3AC89BA8EF99B33069B7310E2E578E2D00ADFD2BE96F0D5623221F82000:8 X-MTK: N Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gVGh1LCAyMDIxLTA3LTE1IGF0IDE1OjA5ICswODAwLCBUenVuZy1CaSBTaGloIHdyb3RlOg0K PiBPbiBUaHUsIEp1bCAxNSwgMjAyMSBhdCAxMDozMiBBTSBLZXdlaSBYdSA8a2V3ZWkueHVAbWVk aWF0ZWsuY29tPiB3cm90ZToNCj4gPiBXaGVuIGNsb2NrLWRpdiBpcyAwIG9yIGdyZWF0ZXIgdGhh biAxLCB0aGUgYnVzIHNwZWVkDQo+ID4gY2FsY3VsYXRlZCBieSB0aGUgb2xkIHNwZWVkIGNhbGN1 bGF0aW9uIGZvcm11bGEgd2lsbCBiZQ0KPiA+IGxhcmdlciB0aGFuIHRoZSB0YXJnZXQgc3BlZWQu IFNvIHdlIHVwZGF0ZSB0aGUgZm9ybXVsYS4NCj4gVGhlIHBhdGNoIHNvdW5kcyBsaWtlIGEgZml4 IHVwLiAgTmVlZCBhICJGaXhlcyIgdGFnLg0KPiANCj4gPiAgICAgICAgIGZvciAoY2xrX2RpdiA9 IDE7IGNsa19kaXYgPD0gbWF4X2Nsa19kaXY7IGNsa19kaXYrKykgew0KPiA+ICAgICAgICAgICAg ICAgICBjbGtfc3JjID0gcGFyZW50X2NsayAvIGNsa19kaXY7DQo+ID4gKyAgICAgICAgICAgICAg IGkyYy0+YWNfdGltaW5nLmludGVyX2Nsa19kaXYgPSBjbGtfZGl2IC0gMTsNCj4gVXNpbmcgdGhl IHdheSB0byBwYXNzIHRoZSBwYXJhbWV0ZXIgImludGVyX2Nsa19kaXYiIHRvDQo+IG10a19pMmNf Y2FsY3VsYXRlX3NwZWVkKCkgbG9va3MgbGlrZSBhIGhhY2suICBpbnRlcl9jbGtfZGl2IGlzIHNl dA0KPiBhZ2FpblsxXSBuZXh0IHRvIHRoZSBmb3IgbG9vcC4NCj4gDQo+IFsxXTogaHR0cHM6Ly9l bGl4aXIuYm9vdGxpbi5jb20vbGludXgvdjUuMTQtcmMxL3NvdXJjZS9kcml2ZXJzL2kyYy9idXNz ZXMvaTJjLW10NjV4eC5jI0w4MzENCj4gDQo+IA0KPiANCj4gSSBoYXZlIG5vIGRvbWFpbiBrbm93 bGVkZ2Ugb2Ygd2hhdC9ob3cgdGhlIHBhdGNoIGZpeGVzLiAgQnV0IGlmIHRoaXMNCj4gaXMgYSBz dGFuZGFsb25lIGZpeHVwIHBhdGNoLCBzdWdnZXN0IHNlcGFyYXRpbmcgdG8gYW4gaW5kZXBlbmRl bnQNCj4gcGF0Y2guDQoNCkhpIFR6dW5nLUJpLA0KDQoxLiBUaGlzIFBhdGNoIGlzIG5vdCBmb3Ig Zml4aW5nIHByZXZpb3VzIGNvbW1pdCxpdCBpcyBqdXN0IGZvciB0aGUgYmFkDQpzcGVlZCBmb3Jt dWxhLg0KDQoyLiBJIHdpbGwgZml4IHRoaXMgcHJvYmxlbSBhY2NvcmRpbmcgdG8geW91ciBzdWdn ZXN0aW9uIGluIHRoZSBuZXh0DQpwYXRjaC4NCg0KVGhhbmtzDQpLZXdlaQ0K 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=-5.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no 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 53EC8C12002 for ; 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Fri, 16 Jul 2021 17:53:57 +0800 Message-ID: <1626429237.29703.16.camel@mhfsdcap03> Subject: Re: [PATCH 8/8] i2c: mediatek: modify bus speed calculation formula From: Kewei Xu To: Tzung-Bi Shih CC: , , , , , , , , , , , , Date: Fri, 16 Jul 2021 17:53:57 +0800 In-Reply-To: References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> <1626316157-24935-9-git-send-email-kewei.xu@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 6F46C422B3AC89BA8EF99B33069B7310E2E578E2D00ADFD2BE96F0D5623221F82000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210716_025625_652881_B641E09D X-CRM114-Status: GOOD ( 16.81 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Thu, 2021-07-15 at 15:09 +0800, Tzung-Bi Shih wrote: > On Thu, Jul 15, 2021 at 10:32 AM Kewei Xu wrote: > > When clock-div is 0 or greater than 1, the bus speed > > calculated by the old speed calculation formula will be > > larger than the target speed. So we update the formula. > The patch sounds like a fix up. Need a "Fixes" tag. > > > for (clk_div = 1; clk_div <= max_clk_div; clk_div++) { > > clk_src = parent_clk / clk_div; > > + i2c->ac_timing.inter_clk_div = clk_div - 1; > Using the way to pass the parameter "inter_clk_div" to > mtk_i2c_calculate_speed() looks like a hack. inter_clk_div is set > again[1] next to the for loop. > > [1]: https://elixir.bootlin.com/linux/v5.14-rc1/source/drivers/i2c/busses/i2c-mt65xx.c#L831 > > > > I have no domain knowledge of what/how the patch fixes. But if this > is a standalone fixup patch, suggest separating to an independent > patch. Hi Tzung-Bi, 1. This Patch is not for fixing previous commit,it is just for the bad speed formula. 2. I will fix this problem according to your suggestion in the next patch. Thanks Kewei _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek 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=-5.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no 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 7A452C07E95 for ; Fri, 16 Jul 2021 09:58:19 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3AD27613EE for ; 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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4Ka5-0040SC-JN; Fri, 16 Jul 2021 09:56:29 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4Ka1-0040Rj-IH; Fri, 16 Jul 2021 09:56:27 +0000 X-UUID: 47737c754f4e43aab72075b38f453006-20210716 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:MIME-Version:Content-Type:References:In-Reply-To:Date:CC:To:From:Subject:Message-ID; bh=phqCD4LJR0pNpBe3FK03xbs4bsxYpn9hSfS9hoyXs+k=; b=YTvmwYpHJUgH8Gjq3kCIA2uZD3b3ML+6Wwyu2kyXUAXulPxEZWEMPOXTKN2XIMBgFfQxMGfwgiLdE3Lu1hWEB7T5fxkZHjOIgBIi7Is4eVPMA1Y/6kgNr/zWftzXvfUqV4aNhPgV7AAjf4H+qLDRHhCjPj8K13mIfBFKpYLkxYk=; X-UUID: 47737c754f4e43aab72075b38f453006-20210716 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 2101136093; Fri, 16 Jul 2021 02:56:22 -0700 Received: from MTKMBS32N1.mediatek.inc (172.27.4.71) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 16 Jul 2021 02:54:01 -0700 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS32N1.mediatek.inc (172.27.4.71) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 16 Jul 2021 17:53:57 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 16 Jul 2021 17:53:57 +0800 Message-ID: <1626429237.29703.16.camel@mhfsdcap03> Subject: Re: [PATCH 8/8] i2c: mediatek: modify bus speed calculation formula From: Kewei Xu To: Tzung-Bi Shih CC: , , , , , , , , , , , , Date: Fri, 16 Jul 2021 17:53:57 +0800 In-Reply-To: References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> <1626316157-24935-9-git-send-email-kewei.xu@mediatek.com> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: 6F46C422B3AC89BA8EF99B33069B7310E2E578E2D00ADFD2BE96F0D5623221F82000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210716_025625_652881_B641E09D X-CRM114-Status: GOOD ( 16.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 2021-07-15 at 15:09 +0800, Tzung-Bi Shih wrote: > On Thu, Jul 15, 2021 at 10:32 AM Kewei Xu wrote: > > When clock-div is 0 or greater than 1, the bus speed > > calculated by the old speed calculation formula will be > > larger than the target speed. So we update the formula. > The patch sounds like a fix up. Need a "Fixes" tag. > > > for (clk_div = 1; clk_div <= max_clk_div; clk_div++) { > > clk_src = parent_clk / clk_div; > > + i2c->ac_timing.inter_clk_div = clk_div - 1; > Using the way to pass the parameter "inter_clk_div" to > mtk_i2c_calculate_speed() looks like a hack. inter_clk_div is set > again[1] next to the for loop. > > [1]: https://elixir.bootlin.com/linux/v5.14-rc1/source/drivers/i2c/busses/i2c-mt65xx.c#L831 > > > > I have no domain knowledge of what/how the patch fixes. But if this > is a standalone fixup patch, suggest separating to an independent > patch. Hi Tzung-Bi, 1. This Patch is not for fixing previous commit,it is just for the bad speed formula. 2. I will fix this problem according to your suggestion in the next patch. Thanks Kewei _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel