From: Juuso Oikarinen <juuso.oikarinen@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Luciano Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Luciano Coelho <luciano.coelho@xxxxxxxxx>
---
drivers/net/wireless/wl12xx/wl1271_boot.c | 8 ++++++--
drivers/net/wireless/wl12xx/wl1271_boot.h | 7 +++++--
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/wl12xx/wl1271_boot.c b/drivers/net/wireless/wl12xx/wl1271_boot.c
index 41c6aff..4195298 100644
--- 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 412443e..95ecc52 100644
--- 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
--
1.6.3.3
--
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