From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: Re: [PATCH v4 5/5] mmc: sdhci-of-arasan: implement enhanced strobe callback Date: Fri, 20 May 2016 14:44:34 +0300 Message-ID: <573EF8A2.5070305@intel.com> References: <1463733285-770-1-git-send-email-shawn.lin@rock-chips.com> <1463733377-986-1-git-send-email-shawn.lin@rock-chips.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: Received: from mga11.intel.com ([192.55.52.93]:22158 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754586AbcETLsi (ORCPT ); Fri, 20 May 2016 07:48:38 -0400 In-Reply-To: <1463733377-986-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: Shawn Lin , Ulf Hansson Cc: Jaehoon Chung , Michal Simek , soren.brinkmann@xilinx.com, Rob Herring , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Anderson , Brian Norris , Heiko Stuebner , linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org On 20/05/16 11:36, Shawn Lin wrote: > Currently sdhci-arasan 5.1 can support enhanced strobe function, > and we now limit it just for "arasan,sdhci-5.1". Add > mmc-hs400-enhanced-strobe in DT to enable the function if we're > sure our controller can support it. > > Signed-off-by: Shawn Lin > Reviewed-by: Doug Anderson Acked-by: Adrian Hunter > --- > > Changes in v4: None > Changes in v3: None > Changes in v2: None > > drivers/mmc/host/sdhci-of-arasan.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c > index b6f4c1d..533e2bc 100644 > --- a/drivers/mmc/host/sdhci-of-arasan.c > +++ b/drivers/mmc/host/sdhci-of-arasan.c > @@ -25,7 +25,9 @@ > #include "sdhci-pltfm.h" > > #define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c > +#define SDHCI_ARASAN_VENDOR_REGISTER 0x78 > > +#define VENDOR_ENHANCED_STROBE BIT(0) > #define CLK_CTRL_TIMEOUT_SHIFT 16 > #define CLK_CTRL_TIMEOUT_MASK (0xf << CLK_CTRL_TIMEOUT_SHIFT) > #define CLK_CTRL_TIMEOUT_MIN_EXP 13 > @@ -79,6 +81,21 @@ static void sdhci_arasan_set_clock(struct sdhci_host *host, unsigned int clock) > } > } > > +static void sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc, > + struct mmc_ios *ios) > +{ > + u32 vendor; > + struct sdhci_host *host = mmc_priv(mmc); > + > + vendor = readl(host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER); > + if (ios->enhanced_strobe) > + vendor |= VENDOR_ENHANCED_STROBE; > + else > + vendor &= ~VENDOR_ENHANCED_STROBE; > + > + writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER); > +} > + > static struct sdhci_ops sdhci_arasan_ops = { > .set_clock = sdhci_arasan_set_clock, > .get_max_clock = sdhci_pltfm_clk_get_max_clock, > @@ -245,6 +262,9 @@ static int sdhci_arasan_probe(struct platform_device *pdev) > dev_err(&pdev->dev, "phy_power_on err.\n"); > goto err_phy_power; > } > + > + host->mmc_host_ops.hs400_enhanced_strobe = > + sdhci_arasan_hs400_enhanced_strobe; > } > > ret = sdhci_add_host(host); >