From: Ido Yariv Date: Tue, 1 Mar 2011 13:14:40 +0000 (+0200) Subject: wl12xx: Change claiming of the SDIO bus X-Git-Tag: firefly_0821_release~7613^2~967^2~16^2~578^2~78^2~6 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=393fb560d328cc06e6a5c7b7473901ad724f82e7;p=firefly-linux-kernel-4.4.55.git wl12xx: Change claiming of the SDIO bus The SDIO bus is claimed and released for each SDIO transaction. In addition to the few CPU cycles it takes to claim and release the bus, it may also cause undesired side effects such as the MMC host stopping its internal clocks. Since only the wl12xx_sdio driver drives this SDIO card, it is safe to claim the SDIO host once (on power on), and release it only when turning the power off. This patch was inspired by Juuso Oikarinen's (juuso.oikarinen@nokia.com) patch "wl12xx: Change claiming of the (SDIO) bus". Signed-off-by: Ido Yariv Reviewed-by: Luciano Coelho Signed-off-by: Luciano Coelho --- diff --git a/drivers/net/wireless/wl12xx/sdio.c b/drivers/net/wireless/wl12xx/sdio.c index f27e91502631..61fdc9e981bd 100644 --- a/drivers/net/wireless/wl12xx/sdio.c +++ b/drivers/net/wireless/wl12xx/sdio.c @@ -107,8 +107,6 @@ static void wl1271_sdio_raw_read(struct wl1271 *wl, int addr, void *buf, int ret; struct sdio_func *func = wl_to_func(wl); - sdio_claim_host(func); - if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) { ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret); wl1271_debug(DEBUG_SDIO, "sdio read 52 addr 0x%x, byte 0x%02x", @@ -124,8 +122,6 @@ static void wl1271_sdio_raw_read(struct wl1271 *wl, int addr, void *buf, wl1271_dump_ascii(DEBUG_SDIO, "data: ", buf, len); } - sdio_release_host(func); - if (ret) wl1271_error("sdio read failed (%d)", ret); } @@ -136,8 +132,6 @@ static void wl1271_sdio_raw_write(struct wl1271 *wl, int addr, void *buf, int ret; struct sdio_func *func = wl_to_func(wl); - sdio_claim_host(func); - if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG_ADDR)) { sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret); wl1271_debug(DEBUG_SDIO, "sdio write 52 addr 0x%x, byte 0x%02x", @@ -153,8 +147,6 @@ static void wl1271_sdio_raw_write(struct wl1271 *wl, int addr, void *buf, ret = sdio_memcpy_toio(func, addr, buf, len); } - sdio_release_host(func); - if (ret) wl1271_error("sdio write failed (%d)", ret); } @@ -176,7 +168,6 @@ static int wl1271_sdio_power_on(struct wl1271 *wl) sdio_claim_host(func); sdio_enable_func(func); - sdio_release_host(func); out: return ret; @@ -187,7 +178,6 @@ static int wl1271_sdio_power_off(struct wl1271 *wl) struct sdio_func *func = wl_to_func(wl); int ret; - sdio_claim_host(func); sdio_disable_func(func); sdio_release_host(func);