Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754587AbdCTLmQ (ORCPT ); Mon, 20 Mar 2017 07:42:16 -0400 Received: from keymaster.Cadence.COM ([158.140.2.26]:60287 "EHLO mx-sanjose5.cadence.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754565AbdCTLmN (ORCPT ); Mon, 20 Mar 2017 07:42:13 -0400 X-CrossPremisesHeadersFilteredBySendConnector: maileu3.global.cadence.com From: Piotr Sroka To: CC: Adrian Hunter , Ulf Hansson , , Masahiro Yamada , Piotr Sroka Subject: [v4 1/3] mmc: sdhci-cadence: Fix writing PHY delay Date: Mon, 20 Mar 2017 11:12:52 +0000 Message-ID: <1490008372-16372-1-git-send-email-piotrs@cadence.com> X-Mailer: git-send-email 2.2.2 MIME-Version: 1.0 Content-Type: text/plain X-OrganizationHeadersPreserved: maileu3.global.cadence.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1329 Lines: 52 Add polling for ACK to be sure that data are written to PHY register. Signed-off-by: Piotr Sroka --- Changes for v2: - fix indent --- Changes for v3: - none --- Changes for v4: - none --- drivers/mmc/host/sdhci-cadence.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c index 316cfec..b2334ec 100644 --- a/drivers/mmc/host/sdhci-cadence.c +++ b/drivers/mmc/host/sdhci-cadence.c @@ -66,11 +66,12 @@ struct sdhci_cdns_priv { void __iomem *hrs_addr; }; -static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv, - u8 addr, u8 data) +static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv, + u8 addr, u8 data) { void __iomem *reg = priv->hrs_addr + SDHCI_CDNS_HRS04; u32 tmp; + int ret; tmp = (data << SDHCI_CDNS_HRS04_WDATA_SHIFT) | (addr << SDHCI_CDNS_HRS04_ADDR_SHIFT); @@ -79,8 +80,14 @@ static void sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv, tmp |= SDHCI_CDNS_HRS04_WR; writel(tmp, reg); + ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 0, 10); + if (ret) + return ret; + tmp &= ~SDHCI_CDNS_HRS04_WR; writel(tmp, reg); + + return 0; } static void sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv) -- 2.2.2