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Tue, 26 Apr 2022 07:24:15 +0000 From: To: , , , CC: , , , Subject: Re: [PATCH] clk: at91: generated: consider range when calculating best rate Thread-Topic: [PATCH] clk: at91: generated: consider range when calculating best rate Thread-Index: AQHYTwYLocsblKFTaE2b4sfTx9QXEKz7LfQAgAaxRIA= Date: Tue, 26 Apr 2022 07:24:15 +0000 Message-ID: References: <20220413071318.244912-1-codrin.ciubotariu@microchip.com> <20220422011216.A4A23C385A5@smtp.kernel.org> In-Reply-To: <20220422011216.A4A23C385A5@smtp.kernel.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=microchip.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b0f35aa1-27ab-4f57-3895-08da2755c4fa x-ms-traffictypediagnostic: CY4PR11MB1638:EE_ x-microsoft-antispam-prvs: x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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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 22.04.2022 04:12, Stephen Boyd wrote: > Quoting Codrin Ciubotariu (2022-04-13 00:13:18) >> clk_generated_best_diff() helps in finding the parent and the divisor to >> compute a rate closest to the required one. However, it doesn't take into >> account the request's range for the new rate. Make sure the new rate >> is within the required range. >> >> Fixes: 8a8f4bf0c480 ("clk: at91: clk-generated: create function to find best_diff") >> Signed-off-by: Codrin Ciubotariu >> --- > > Is this fixing anything real or it's just a thing that you noticed and > sent a patch to fix? It fixes the clk_set_min/max_rate() calls to a generated clock. Do you want me to add this fact in the commit description? > >> drivers/clk/at91/clk-generated.c | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c >> index 23cc8297ec4c..d429ba52a719 100644 >> --- a/drivers/clk/at91/clk-generated.c >> +++ b/drivers/clk/at91/clk-generated.c >> @@ -117,6 +117,10 @@ static void clk_generated_best_diff(struct clk_rate_request *req, >> tmp_rate = parent_rate; >> else >> tmp_rate = parent_rate / div; >> + >> + if (tmp_rate < req->min_rate || tmp_rate > req->max_rate) >> + return; >> + >> tmp_diff = abs(req->rate - tmp_rate); >> >> if (*best_diff < 0 || *best_diff >= tmp_diff) { _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel