From: Aapo Vienamo <avienamo@nvidia.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Mikko Perttunen <mperttunen@nvidia.com>
Cc: <linux-mmc@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-tegra@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Aapo Vienamo <avienamo@nvidia.com>
Subject: [PATCH 04/10] mmc: tegra: Disable card clock during pad calibration
Date: Tue, 24 Jul 2018 17:34:20 +0300 [thread overview]
Message-ID: <1532442865-6391-3-git-send-email-avienamo@nvidia.com> (raw)
In-Reply-To: <1532442865-6391-1-git-send-email-avienamo@nvidia.com>
Disable the card clock during automatic pad drive strength calibration
and re-enable it aftewards.
Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
---
drivers/mmc/host/sdhci-tegra.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 61067b7..0de74f4 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -52,6 +52,7 @@
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL 0x1e0
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_MASK 0x0000000f
#define SDHCI_TEGRA_SDMEM_COMP_PADCTRL_VREF_SEL_VAL 0x7
+#define SDHCI_TEGRA_PAD_E_INPUT_OR_E_PWRD BIT(31)
#define SDHCI_TEGRA_AUTO_CAL_STATUS 0x1ec
#define SDHCI_TEGRA_AUTO_CAL_ACTIVE BIT(31)
@@ -226,11 +227,35 @@ static void tegra_sdhci_configure_cal_pad(struct sdhci_host *host, bool enable)
udelay(1);
}
+static bool tegra_sdhci_configure_card_clk(struct sdhci_host *host, bool enable)
+{
+ bool orig_enabled;
+ u32 reg;
+
+ reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+ orig_enabled = reg & SDHCI_CLOCK_CARD_EN;
+
+ if (orig_enabled == enable)
+ return orig_enabled;
+
+ if (enable)
+ reg |= SDHCI_CLOCK_CARD_EN;
+ else
+ reg &= ~SDHCI_CLOCK_CARD_EN;
+
+ sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL);
+
+ return orig_enabled;
+}
+
static void tegra_sdhci_pad_autocalib(struct sdhci_host *host)
{
unsigned timeout = 10;
+ bool card_clk_enabled;
u32 reg;
+ card_clk_enabled = tegra_sdhci_configure_card_clk(host, false);
+
tegra_sdhci_configure_cal_pad(host, true);
reg = sdhci_readl(host, SDHCI_TEGRA_AUTO_CAL_CONFIG);
@@ -248,6 +273,8 @@ static void tegra_sdhci_pad_autocalib(struct sdhci_host *host)
tegra_sdhci_configure_cal_pad(host, false);
+ tegra_sdhci_configure_card_clk(host, card_clk_enabled);
+
if (timeout == 0)
dev_err(mmc_dev(host->mmc), "Pad autocal timed out\n");
}
--
2.7.4
next prev parent reply other threads:[~2018-07-24 14:34 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-24 14:29 [PATCH 00/10] Update the pad autocal procedure Aapo Vienamo
2018-07-24 14:29 ` [PATCH 01/10] mmc: tegra: Poll for calibration completion Aapo Vienamo
2018-07-25 7:04 ` Mikko Perttunen
2018-07-24 14:34 ` [PATCH 02/10] mmc: tegra: Set calibration pad voltage reference Aapo Vienamo
2018-07-24 14:34 ` [PATCH 03/10] mmc: tegra: Power on the calibration pad Aapo Vienamo
2018-07-25 7:11 ` Mikko Perttunen
2018-07-24 14:34 ` Aapo Vienamo [this message]
2018-07-25 7:14 ` [PATCH 04/10] mmc: tegra: Disable card clock during pad calibration Mikko Perttunen
2018-07-24 14:34 ` [PATCH 05/10] dt-bindings: Add Tegra SDHCI pad pdpu offset bindings Aapo Vienamo
2018-07-25 7:16 ` Mikko Perttunen
2018-07-24 14:34 ` [PATCH 06/10] mmc: tegra: Program pad autocal offsets from dt Aapo Vienamo
2018-07-25 7:24 ` Mikko Perttunen
2018-07-24 14:34 ` [PATCH 07/10] arm64: dts: tegra186: Add sdmmc pad auto calibration offsets Aapo Vienamo
2018-07-24 14:34 ` [PATCH 08/10] arm64: dts: tegra210: " Aapo Vienamo
2018-07-24 14:34 ` [PATCH 09/10] mmc: tegra: Perform pad calibration after voltage switch Aapo Vienamo
2018-07-25 7:25 ` Mikko Perttunen
2018-07-25 10:43 ` Aapo Vienamo
2018-07-25 7:08 ` [PATCH 02/10] mmc: tegra: Set calibration pad voltage reference Mikko Perttunen
2018-07-25 10:00 ` Aapo Vienamo
2018-07-25 12:06 ` [PATCH 00/10] Update the pad autocal procedure Peter Geis
2018-07-25 14:28 ` Aapo Vienamo
2018-07-25 14:27 ` [PATCH 10/10] mmc: tegra: Enable pad calibration on Tegra210 and Tegra186 Aapo Vienamo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1532442865-6391-3-git-send-email-avienamo@nvidia.com \
--to=avienamo@nvidia.com \
--cc=adrian.hunter@intel.com \
--cc=devicetree@vger.kernel.org \
--cc=jonathanh@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=linux-tegra@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mperttunen@nvidia.com \
--cc=robh+dt@kernel.org \
--cc=thierry.reding@gmail.com \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).