From patchwork Mon Mar 11 18:02:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sowjanya Komatineni X-Patchwork-Id: 10847935 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D557E6C2 for ; Mon, 11 Mar 2019 18:03:28 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C25CC29291 for ; Mon, 11 Mar 2019 18:03:28 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B67E7292C8; Mon, 11 Mar 2019 18:03:28 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 55D1E29291 for ; Mon, 11 Mar 2019 18:03:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727988AbfCKSCo (ORCPT ); Mon, 11 Mar 2019 14:02:44 -0400 Received: from hqemgate14.nvidia.com ([216.228.121.143]:9767 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727008AbfCKSCn (ORCPT ); Mon, 11 Mar 2019 14:02:43 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 11 Mar 2019 11:02:44 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Mon, 11 Mar 2019 11:02:42 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Mon, 11 Mar 2019 11:02:42 -0700 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 11 Mar 2019 18:02:42 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 11 Mar 2019 18:02:42 +0000 Received: from skomatineni-linux.nvidia.com (Not Verified[10.110.103.53]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Mon, 11 Mar 2019 11:02:42 -0700 From: Sowjanya Komatineni To: , , , , CC: , , , , , , Subject: [PATCH V2 02/10] mmc: sdhci: allow host to specify maximum tuning loops Date: Mon, 11 Mar 2019 11:02:31 -0700 Message-ID: <1552327359-8036-2-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1552327359-8036-1-git-send-email-skomatineni@nvidia.com> References: <1552327359-8036-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1552327364; bh=QW+qvi1XMAJOuUTjk+X0lOvp6QOHlS0K7vDz+5MBqBI=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=T9zU464eTv45owJ9Y5TPne9WjxAjAzTSpKVYZvtMtwOyxJ9PFkzNpfA7/i3obF5Kp hszXGOvrVXyhe9Bi6+ZW14ZMoRoVWT02+tTB087AVoXlyg6uiKTU6a/IjDuFCloK16 Hfp0FbAkaUZj3x5iy94a9mW1Lets64l9KqJXrdhiBSBJtnghDb6pKRNrAjc+dMNMIn c2YAhrA1vSLwGjyFIBhlcnM9rOfnOAo576XNmkjHSr/H4kSpHvv7fqRZG39fddddH4 DxQDB4Lh8pIT9bPhwA0SkKWVcJm+3Rxvf7NVDCnunKmVyx2dzZta4YAIlTQdBt1ue/ JnQmak7+ctL7Q== Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP As per the Host Controller Standard Specification Version 4.20, limitation of tuning iteration count is removed as PLL locking time can be longer than UHS-1 tuning due to larger PVT fluctuation and it will result in increase of tuning iteration to complete the tuning. This patch creates sdhci_host member tuning_loop_count to allow hosts to specify maximum tuning iterations and also updates execute_tuning to use this specified maximum tuning iteration count. Default tuning_loop_count is set to same as existing loop count of MAX_TUNING_LOOP which is 40 iterations. Tested-by: Jon Hunter Signed-off-by: Sowjanya Komatineni --- drivers/mmc/host/sdhci.c | 5 +++-- drivers/mmc/host/sdhci.h | 1 + 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index a8141ff9be03..bbc0e0bb7128 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -2369,9 +2369,9 @@ static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) /* * Issue opcode repeatedly till Execute Tuning is set to 0 or the number - * of loops reaches 40 times. + * of loops reaches tuning loop count. */ - for (i = 0; i < MAX_TUNING_LOOP; i++) { + for (i = 0; i < host->tuning_loop_count; i++) { u16 ctrl; sdhci_send_tuning(host, opcode); @@ -3494,6 +3494,7 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev, host->cqe_err_ier = SDHCI_CQE_INT_ERR_MASK; host->tuning_delay = -1; + host->tuning_loop_count = MAX_TUNING_LOOP; host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG; diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 01002cba1359..57bb3e3dca89 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -596,6 +596,7 @@ struct sdhci_host { #define SDHCI_TUNING_MODE_3 2 /* Delay (ms) between tuning commands */ int tuning_delay; + int tuning_loop_count; /* Host SDMA buffer boundary. */ u32 sdma_boundary;