Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933026AbdCUOdQ (ORCPT ); Tue, 21 Mar 2017 10:33:16 -0400 Received: from mx0a-0014ca01.pphosted.com ([208.84.65.235]:35485 "EHLO mx0a-0014ca01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932968AbdCUOdO (ORCPT ); Tue, 21 Mar 2017 10:33:14 -0400 X-CrossPremisesHeadersFilteredBySendConnector: maileu3.global.cadence.com From: Piotr Sroka To: CC: Adrian Hunter , Ulf Hansson , , Masahiro Yamada , Piotr Sroka Subject: [v5 1/4] mmc: sdhci-cadence: Fix writing PHY delay Date: Tue, 21 Mar 2017 14:32:16 +0000 Message-ID: <1490106736-2242-1-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: 1432 Lines: 55 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 --- Changes for v5: - use driver version from next branch, with applied enhanced strobe feature support. --- 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 48f6419..83c3b55 100644 --- a/drivers/mmc/host/sdhci-cadence.c +++ b/drivers/mmc/host/sdhci-cadence.c @@ -68,11 +68,12 @@ struct sdhci_cdns_priv { bool enhanced_strobe; }; -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); @@ -81,8 +82,14 @@ 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