From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 627A333BBA0; Wed, 3 Dec 2025 16:24:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764779055; cv=none; b=YxhQUHn12+sEecECq2q4hbLWVqUUPr4jEl7wKBhIwPSuUctFURjAOJTbw7VdSMy6phFrykF05DBNulxd9FcN4UPHmejV4Umb6U19ffXKLjouRqm+f1qspglOEfR97gksThth6HpRMe4+mfoyjnh7V+0JORRdRJx2UFFZstfLCaY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764779055; c=relaxed/simple; bh=OJgkeDXsa9rPwxzDjZCgvm0sfcTJfStgQ6obqrHcXOY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VPsI/YCFHUkVgABONiaJ7kubTTuPM3rpTF5068okj6AnsX/JLkkD0Pz1hmjNeRatswUjcGsFWF5VIUcgiyIawCsTbpRFso57lUTvLOOjlnF1nMUu0JRWIN5e60I0IqzNW4HItS92oQnaD/yotl6UotjhJQmCkiVZQ0CxgxdQ91I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=M9cpYZsX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="M9cpYZsX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6F09C4CEF5; Wed, 3 Dec 2025 16:24:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764779055; bh=OJgkeDXsa9rPwxzDjZCgvm0sfcTJfStgQ6obqrHcXOY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M9cpYZsXQt5gqLVUbbKCzBj9o2AcYkKAVVEPKWfEMFvY15lm0Uw09msE1nSO0Ek73 2TBt9FsCcosK2VAsqIArMbP2Bs7OX52zNVRksvVgbxeE/1opN979SJehg+ljARfm3F EZMTj2F1l4lqaFOe/61xBZeZitqYIiiQUUd06PtY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sarthak Garg , Adrian Hunter , Ulf Hansson , Sasha Levin Subject: [PATCH 6.1 108/568] mmc: sdhci-msm: Enable tuning for SDR50 mode for SD card Date: Wed, 3 Dec 2025 16:21:50 +0100 Message-ID: <20251203152444.691345935@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251203152440.645416925@linuxfoundation.org> References: <20251203152440.645416925@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sarthak Garg [ Upstream commit 08b68ca543ee9d5a8d2dc406165e4887dd8f170b ] For Qualcomm SoCs which needs level shifter for SD card, extra delay is seen on receiver data path. To compensate this delay enable tuning for SDR50 mode for targets which has level shifter. SDHCI_SDR50_NEEDS_TUNING caps will be set for targets with level shifter on Qualcomm SOC's. Signed-off-by: Sarthak Garg Acked-by: Adrian Hunter Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin --- drivers/mmc/host/sdhci-msm.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index f507fa491c58f..996ab8c760d35 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -79,6 +79,7 @@ #define CORE_IO_PAD_PWR_SWITCH_EN BIT(15) #define CORE_IO_PAD_PWR_SWITCH BIT(16) #define CORE_HC_SELECT_IN_EN BIT(18) +#define CORE_HC_SELECT_IN_SDR50 (4 << 19) #define CORE_HC_SELECT_IN_HS400 (6 << 19) #define CORE_HC_SELECT_IN_MASK (7 << 19) @@ -1129,6 +1130,10 @@ static bool sdhci_msm_is_tuning_needed(struct sdhci_host *host) { struct mmc_ios *ios = &host->mmc->ios; + if (ios->timing == MMC_TIMING_UHS_SDR50 && + host->flags & SDHCI_SDR50_NEEDS_TUNING) + return true; + /* * Tuning is required for SDR104, HS200 and HS400 cards and * if clock frequency is greater than 100MHz in these modes. @@ -1197,6 +1202,8 @@ static int sdhci_msm_execute_tuning(struct mmc_host *mmc, u32 opcode) struct mmc_ios ios = host->mmc->ios; struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); + const struct sdhci_msm_offset *msm_offset = msm_host->offset; + u32 config; if (!sdhci_msm_is_tuning_needed(host)) { msm_host->use_cdr = false; @@ -1213,6 +1220,14 @@ static int sdhci_msm_execute_tuning(struct mmc_host *mmc, u32 opcode) */ msm_host->tuning_done = 0; + if (ios.timing == MMC_TIMING_UHS_SDR50 && + host->flags & SDHCI_SDR50_NEEDS_TUNING) { + config = readl_relaxed(host->ioaddr + msm_offset->core_vendor_spec); + config &= ~CORE_HC_SELECT_IN_MASK; + config |= CORE_HC_SELECT_IN_EN | CORE_HC_SELECT_IN_SDR50; + writel_relaxed(config, host->ioaddr + msm_offset->core_vendor_spec); + } + /* * For HS400 tuning in HS200 timing requires: * - select MCLK/2 in VENDOR_SPEC -- 2.51.0