[PATCH 6/7] ath9k: Allow using the reset API for the external reset
From: Alban <albeu@free.fr>
Date: 2017-03-13 21:08:18
Also in:
linux-wireless, lkml
Subsystem:
atheros ath generic utilities, qualcomm atheros ath9k wireless driver, the rest · Maintainers:
Jeff Johnson, Toke Høiland-Jørgensen, Linus Torvalds
From: Alban Bedel <albeu@free.fr> Allow using the reset API instead of a platform specific callback to reset the device. Signed-off-by: Alban Bedel <albeu@free.fr> --- drivers/net/wireless/ath/ath9k/hw.c | 26 +++++++++++++++++++++----- drivers/net/wireless/ath/ath9k/hw.h | 1 + drivers/net/wireless/ath/ath9k/init.c | 10 ++++++++++ 3 files changed, 32 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 8c5c2dd..efc0435 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c@@ -21,6 +21,7 @@ #include <linux/bitops.h> #include <linux/etherdevice.h> #include <linux/gpio.h> +#include <linux/reset.h> #include <asm/unaligned.h> #include "hw.h"
@@ -551,6 +552,24 @@ static int ath9k_hw_attach_ops(struct ath_hw *ah) return 0; } +static int ath9k_hw_external_reset(struct ath_hw *ah) +{ + int ret = 0; + + ath_dbg(ath9k_hw_common(ah), RESET, + "reset MAC via external reset\n"); + + if (ah->external_reset) { + ret = ah->external_reset(); + } else if (ah->reset) { + ret = reset_control_assert(ah->reset); + if (!ret) + ret = reset_control_deassert(ah->reset); + } + + return ret; +} + /* Called for all hardware families */ static int __ath9k_hw_init(struct ath_hw *ah) {
@@ -1286,14 +1305,11 @@ static bool ath9k_hw_ar9330_reset_war(struct ath_hw *ah, int type) break; } - if (ah->external_reset && + if ((ah->reset || ah->external_reset) && (npend || type == ATH9K_RESET_COLD)) { int reset_err = 0; - ath_dbg(ath9k_hw_common(ah), RESET, - "reset MAC via external reset\n"); - - reset_err = ah->external_reset(); + reset_err = ath9k_hw_external_reset(ah); if (reset_err) { ath_err(ath9k_hw_common(ah), "External reset failed, err=%d\n",
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 7f17c2a..53b67e3 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h@@ -966,6 +966,7 @@ struct ath_hw { bool is_clk_25mhz; int (*get_mac_revision)(void); int (*external_reset)(void); + struct reset_control *reset; bool disable_2ghz; bool disable_5ghz;
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 5cb9c61..f1cb806 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c@@ -25,6 +25,7 @@ #include <linux/nvmem-consumer.h> #include <linux/relay.h> #include <linux/clk.h> +#include <linux/reset.h> #include <net/ieee80211_radiotap.h> #include "ath9k.h"
@@ -697,6 +698,15 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc, if (!is_valid_ether_addr(common->macaddr)) ath9k_get_nvmem_address(sc); + /* Try to get a reset controller */ + ah->reset = devm_reset_control_get_optional(sc->dev, NULL); + if (IS_ERR(ah->reset)) { + if (PTR_ERR(ah->reset) != -ENOENT && + PTR_ERR(ah->reset) != -ENOTSUPP) + return PTR_ERR(ah->reset); + ah->reset = NULL; + } + /* If the EEPROM hasn't been retrieved via firmware request * use the nvmem API insted. */
--
2.7.4