From: Renius Chen <reniuschengl@gmail.com>
To: ulf.hansson@linaro.org, adrian.hunter@intel.com
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
ben.chuang@genesyslogic.com.tw, greg.tu@genesyslogic.com.tw,
Renius Chen <reniuschengl@gmail.com>
Subject: [PATCH] mmc: sdhci-pci-gli: Enable short circuit protection mechanism of GL9755
Date: Thu, 25 Feb 2021 19:13:07 +0800 [thread overview]
Message-ID: <20210225111307.62975-1-reniuschengl@gmail.com> (raw)
Short circuit protection mechanism of GL9755 is disabled by HW default
setting. Enable short circuit protection to prevent GL9755 from being
damaged by short circuit or over current.
Signed-off-by: Renius Chen <reniuschengl@gmail.com>
---
drivers/mmc/host/sdhci-pci-gli.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 5606bdc08a96..7ba0fd601696 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -123,6 +123,9 @@
#define PCI_GLI_9755_PLLSSC 0x68
#define PCI_GLI_9755_PLLSSC_PPM GENMASK(15, 0)
+#define PCI_GLI_9755_SerDes 0x70
+#define PCI_GLI_9755_SCP_DIS BIT(19)
+
#define GLI_MAX_TUNING_LOOP 40
/* Genesys Logic chipset */
@@ -547,6 +550,11 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
value &= ~PCI_GLI_9755_DMACLK;
pci_write_config_dword(pdev, PCI_GLI_9755_PECONF, value);
+ /* enable short circuit protection */
+ pci_read_config_dword(pdev, PCI_GLI_9755_SerDes, &value);
+ value &= ~PCI_GLI_9755_SCP_DIS;
+ pci_write_config_dword(pdev, PCI_GLI_9755_SerDes, value);
+
gl9755_wt_off(pdev);
}
--
2.27.0
next reply other threads:[~2021-02-25 11:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-25 11:13 Renius Chen [this message]
2021-03-02 10:39 ` [PATCH] mmc: sdhci-pci-gli: Enable short circuit protection mechanism of GL9755 Ulf Hansson
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