On 2016/8/26 16:42, Mike Looijmans wrote:
On 26-08-16 01:01, Zach Brown wrote:
The sdhci controller on xilinx zynq devices will not function unless
the CD bit is provided. http://www.xilinx.com/support/answers/61064.html
In cases where it is impossible to provide the CD bit in hardware,
setting the controller to test mode and then setting inserted to true
will get the controller to function without the CD bit.
When the device has the property broken-cd the driver changes the
controller to test mode and sets test inserted to true to make the
controller function.
Signed-off-by: Zach Brown <zach.brown@xxxxxx>
---
drivers/mmc/host/sdhci-of-arasan.c | 17 ++++++++++++++++-
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci-of-arasan.c
b/drivers/mmc/host/sdhci-of-arasan.c
index e0f193f..3798a3b 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -26,6 +26,7 @@
#include <linux/phy/phy.h>
#include <linux/regmap.h>
#include "sdhci-pltfm.h"
+#include <linux/of.h>
Not needed.
#define SDHCI_ARASAN_CLK_CTRL_OFFSET 0x2c
#define SDHCI_ARASAN_VENDOR_REGISTER 0x78
@@ -203,12 +204,26 @@ static void
sdhci_arasan_hs400_enhanced_strobe(struct mmc_host *mmc,
writel(vendor, host->ioaddr + SDHCI_ARASAN_VENDOR_REGISTER);
}
+void sdhci_arasan_reset(struct sdhci_host *host, u8 mask)
+{
+ u8 ctrl;
+
+ sdhci_reset(host, mask);
+
+ if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) {
+ ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
+ ctrl |= SDHCI_CTRL_CDTEST_INS |
+ SDHCI_CTRL_CDTEST_EN;
+ sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+ }
+}
Although I don't have a "broken-cd" arasan controller,
but are you suring that all the broken-cd arasan controller
need to set these bit either? It seems your case is vendor specific?:)
+
static struct sdhci_ops sdhci_arasan_ops = {
.set_clock = sdhci_arasan_set_clock,
.get_max_clock = sdhci_pltfm_clk_get_max_clock,
.get_timeout_clock = sdhci_arasan_get_timeout_clock,
.set_bus_width = sdhci_set_bus_width,
- .reset = sdhci_reset,
+ .reset = sdhci_arasan_reset,
.set_uhs_signaling = sdhci_set_uhs_signaling,
};
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 0411c9f..8d92d6e9 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -84,6 +84,8 @@
#define SDHCI_CTRL_ADMA32 0x10
#define SDHCI_CTRL_ADMA64 0x18
#define SDHCI_CTRL_8BITBUS 0x20
+#define SDHCI_CTRL_CDTEST_INS 0x40
+#define SDHCI_CTRL_CDTEST_EN 0x80
#define SDHCI_POWER_CONTROL 0x29
#define SDHCI_POWER_ON 0x01
Looks okay, tested it and appears to work just as well as a tie-off in
logic.
Tested-by: mike.looijmans@xxxxxxxx
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Best Regards
Shawn Lin
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