From 690390d841d262134ea12f0cd5e208de24c99ae8 Mon Sep 17 00:00:00 2001 From: Chin-Yen Lee Date: Fri, 30 Oct 2020 16:48:23 +0800 Subject: [PATCH] rtw88: sync the power state between driver and firmware In current flow, driver issues power requests to firmware for entering or leaving deep power mode. But driver does not wait for an ack from firmware via reading CPWM register when driver requests to enter deep power mode. The behavior will lead to unsynchronized state between firmware and driver. Furthermore, consecutive same power requests may confuse firmware and leads to unexpected value of CPWM register. This patch ensures that the power request will wait for an ack from firmware and only send one power request each time. Signed-off-by: Chin-Yen Lee Signed-off-by: Tzu-En Huang Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20201030084826.9034-2-tehuang@realtek.com --- drivers/net/wireless/realtek/rtw88/ps.c | 69 ++++++++++++++------------------- 1 file changed, 30 insertions(+), 39 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/ps.c b/drivers/net/wireless/realtek/rtw88/ps.c index 7a189a9..8ed2436 100644 --- a/drivers/net/wireless/realtek/rtw88/ps.c +++ b/drivers/net/wireless/realtek/rtw88/ps.c @@ -68,48 +68,39 @@ int rtw_leave_ips(struct rtw_dev *rtwdev) void rtw_power_mode_change(struct rtw_dev *rtwdev, bool enter) { u8 request, confirm, polling; - u8 polling_cnt; - u8 retry_cnt = 0; - - for (retry_cnt = 0; retry_cnt < 3; retry_cnt++) { - request = rtw_read8(rtwdev, rtwdev->hci.rpwm_addr); - confirm = rtw_read8(rtwdev, rtwdev->hci.cpwm_addr); - - /* toggle to request power mode, others remain 0 */ - request ^= request | BIT_RPWM_TOGGLE; - if (!enter) { - request |= POWER_MODE_ACK; - } else { - request |= POWER_MODE_LCLK; - if (rtw_fw_lps_deep_mode == LPS_DEEP_MODE_PG) - request |= POWER_MODE_PG; - } - - rtw_write8(rtwdev, rtwdev->hci.rpwm_addr, request); - - if (enter) - return; + int ret; - /* check confirm power mode has left power save state */ - for (polling_cnt = 0; polling_cnt < 50; polling_cnt++) { - polling = rtw_read8(rtwdev, rtwdev->hci.cpwm_addr); - if ((polling ^ confirm) & BIT_RPWM_TOGGLE) - return; - udelay(100); - } - - /* in case of fw/hw missed the request, retry */ - rtw_warn(rtwdev, "failed to leave deep PS, retry=%d\n", - retry_cnt); + request = rtw_read8(rtwdev, rtwdev->hci.rpwm_addr); + confirm = rtw_read8(rtwdev, rtwdev->hci.cpwm_addr); + + /* toggle to request power mode, others remain 0 */ + request ^= request | BIT_RPWM_TOGGLE; + if (enter) { + request |= POWER_MODE_LCLK; + if (rtw_fw_lps_deep_mode == LPS_DEEP_MODE_PG) + request |= POWER_MODE_PG; } + /* Each request require an ack from firmware */ + request |= POWER_MODE_ACK; - /* Hit here means that driver failed to change hardware power mode to - * active state after retry 3 times. If the power state is locked at - * Deep sleep, most of the hardware circuits is not working, even - * register read/write. It should be treated as fatal error and - * requires an entire analysis about the firmware/hardware - */ - WARN(1, "Hardware power state locked\n"); + rtw_write8(rtwdev, rtwdev->hci.rpwm_addr, request); + + /* Check firmware get the power requset and ack via cpwm register */ + ret = read_poll_timeout_atomic(rtw_read8, polling, + (polling ^ confirm) & BIT_RPWM_TOGGLE, + 100, 15000, true, rtwdev, + rtwdev->hci.cpwm_addr); + if (ret) { + /* Hit here means that driver failed to get an ack from firmware. + * The reason could be that hardware is locked at Deep sleep, + * so most of the hardware circuits are not working, even + * register read/write; or firmware is locked in some state and + * cannot get the request. It should be treated as fatal error + * and requires an entire analysis about the firmware/hardware. + */ + WARN(1, "firmware failed to ack driver for %s Deep Power mode\n", + enter ? "entering" : "leaving"); + } } EXPORT_SYMBOL(rtw_power_mode_change); -- 2.7.4