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| From | Shawn Lin <shawn.lin@rock-chips.com> |
| Newsgroups | linux.kernel |
| Subject | [PATCH v4 5/5] mmc: sdhci-of-arasan: implement enhanced strobe callback |
| Date | Fri, 20 May 2016 10:40:02 +0200 |
| Message-ID | <rAO8q-3ca-17@gated-at.bofh.it> (permalink) |
| References | <rAO8q-3ca-11@gated-at.bofh.it> |
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| X-Original-Cc | Adrian Hunter <adrian.hunter@intel.com>, Jaehoon Chung <jh80.chung@samsung.com>, Michal Simek <michal.simek@xilinx.com>, soren.brinkmann@xilinx.com, Rob Herring <robh+dt@kernel.org>, linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Anderson <dianders@chromium.org>, Brian Norris <briannorris@chromium.org>, Heiko Stuebner <heiko@sntech.de>, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, Shawn Lin <shawn.lin@rock-chips.com> |
| X-Original-Date | Fri, 20 May 2016 16:36:17 +0800 |
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| Xref | csiph.com linux.kernel:1404247 |
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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 <shawn.lin@rock-chips.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
---
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);
--
2.3.7
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[PATCH v4 0/5] Add enhanced strobe support for emmc version 5.1 or later Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 10:40 +0200
[PATCH v4 5/5] mmc: sdhci-of-arasan: implement enhanced strobe callback Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 10:40 +0200
Re: [PATCH v4 5/5] mmc: sdhci-of-arasan: implement enhanced strobe callback Adrian Hunter <adrian.hunter@intel.com> - 2016-05-20 13:50 +0200
[PATCH v4 2/5] mmc: core: add mmc-hs400-enhanced-strobe support Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 10:40 +0200
[PATCH v4 4/5] mmc: debugfs: add HS400 enhanced strobe description Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 10:40 +0200
[PATCH v4 3/5] mmc: core: implement enhanced strobe support Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 10:40 +0200
Re: [PATCH v4 3/5] mmc: core: implement enhanced strobe support Adrian Hunter <adrian.hunter@intel.com> - 2016-05-20 12:10 +0200
Re: [PATCH v4 3/5] mmc: core: implement enhanced strobe support Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 14:00 +0200
[PATCH v4 1/5] Documentation: mmc: add mmc-hs400-enhanced-strobe Shawn Lin <shawn.lin@rock-chips.com> - 2016-05-20 10:40 +0200
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