wl1271: Configure clock-request drive mode to open-drain

This patch configures the wl1271 chipset clock-request line to be
driver in open-drain mode instead of push-pull.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/wl12xx/wl1271_boot.c b/drivers/net/wireless/wl12xx/wl1271_boot.c
index 41c6affbee29a75657e3534420b02c9ffeda3245..4195298b5abca06882703a8ab5b0d0b0a92f7c16 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1271_boot.c
+++ b/drivers/net/wireless/wl12xx/wl1271_boot.c
@@ -451,11 +451,15 @@ int wl1271_boot(struct wl1271 *wl)
 
        if (REF_CLOCK != 0) {
                u16 val;
-               /* Set clock type */
+               /* Set clock type (open drain) */
                val = wl1271_top_reg_read(wl, OCP_REG_CLK_TYPE);
                val &= FREF_CLK_TYPE_BITS;
-               val |= CLK_REQ_PRCM;
                wl1271_top_reg_write(wl, OCP_REG_CLK_TYPE, val);
+
+               /* Set clock pull mode (no pull) */
+               val = wl1271_top_reg_read(wl, OCP_REG_CLK_PULL);
+               val |= NO_PULL;
+               wl1271_top_reg_write(wl, OCP_REG_CLK_PULL, val);
        } else {
                u16 val;
                /* Set clock polarity */

diff --git a/drivers/net/wireless/wl12xx/wl1271_boot.h b/drivers/net/wireless/wl12xx/wl1271_boot.h
index 412443ee655a6cf8761190a22efb5d96f9670414..95ecc52419596a22195d220ea6313e255ac3af7e 100644 (file)
--- a/drivers/net/wireless/wl12xx/wl1271_boot.h
+++ b/drivers/net/wireless/wl12xx/wl1271_boot.h
@@ -53,10 +53,13 @@ struct wl1271_static_data {
 #define OCP_REG_POLARITY     0x0064
 #define OCP_REG_CLK_TYPE     0x0448
 #define OCP_REG_CLK_POLARITY 0x0cb2
+#define OCP_REG_CLK_PULL     0x0cb4
 
-#define CMD_MBOX_ADDRESS 0x407B4
 
-#define POLARITY_LOW BIT(1)
+#define CMD_MBOX_ADDRESS     0x407B4
+
+#define POLARITY_LOW         BIT(1)
+#define NO_PULL              (BIT(14) | BIT(15))
 
 #define FREF_CLK_TYPE_BITS     0xfffffe7f
 #define CLK_REQ_PRCM           0x100