[PATCH 5.16 0461/1017] mt76: mt7921s: fix mt7921s_mcu_[fw|drv]_pmctrl

Greg Kroah-Hartman
2022-04-05T12:35:36Z

From: Leon Yen <leon.yen@mediatek.com>

[ Upstream commit b12deb5e86fa36dc6f3aa3321f5da27addec4f1f ]

According to the firmware behavior (even the oldest one in linux-firmware)
If the firmware is downloaded, MT7921S must rely on the additional mailbox
mechanism that resides in firmware to check if the device is the right
state for mt7921s_mcu_[fw|drv]_pmctrl. Otherwise, we still apply the old
way for that.

That is a necessary patch before we enable runtime pm for mt7921s as
default.

Fixes: 48fab5bbef40 ("mt76: mt7921: introduce mt7921s support")
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Leon Yen <leon.yen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../wireless/mediatek/mt76/mt7921/sdio_mcu.c | 38 +++++++++++++++++++
drivers/net/wireless/mediatek/mt76/sdio.h | 2 +
2 files changed, 40 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c
index 437cddad9a90..353d99fef065 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mcu.c
@@ -49,6 +49,26 @@ mt7921s_mcu_send_message(struct mt76_dev *mdev, struct sk_buff *skb,
return ret;
}

+static u32 mt7921s_read_rm3r(struct mt7921_dev *dev)
+{
+ struct mt76_sdio *sdio = &dev->mt76.sdio;
+
+ return sdio_readl(sdio->func, MCR_D2HRM3R, NULL);
+}
+
+static u32 mt7921s_clear_rm3r_drv_own(struct mt7921_dev *dev)
+{
+ struct mt76_sdio *sdio = &dev->mt76.sdio;
+ u32 val;
+
+ val = sdio_readl(sdio->func, MCR_D2HRM3R, NULL);
+ if (val)
+ sdio_writel(sdio->func, H2D_SW_INT_CLEAR_MAILBOX_ACK,
+ MCR_WSICR, NULL);
+
+ return val;
+}
+
int mt7921s_mcu_init(struct mt7921_dev *dev)
{
static const struct mt76_mcu_ops mt7921s_mcu_ops = {
@@ -88,6 +108,12 @@ int mt7921s_mcu_drv_pmctrl(struct mt7921_dev *dev)

err = readx_poll_timeout(mt76s_read_pcr, &dev->mt76, status,
status & WHLPCR_IS_DRIVER_OWN, 2000, 1000000);
+
+ if (!err && test_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state))
+ err = readx_poll_timeout(mt7921s_read_rm3r, dev, status,
+ status & D2HRM3R_IS_DRIVER_OWN,
+ 2000, 1000000);
+
sdio_release_host(func);

if (err < 0) {
@@ -115,12 +141,24 @@ int mt7921s_mcu_fw_pmctrl(struct mt7921_dev *dev)

sdio_claim_host(func);

+ if (test_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state)) {
+ err = readx_poll_timeout(mt7921s_clear_rm3r_drv_own,
+ dev, status,
+ !(status & D2HRM3R_IS_DRIVER_OWN),
+ 2000, 1000000);
+ if (err < 0) {
+ dev_err(dev->mt76.dev, "mailbox ACK not cleared\n");
+ goto err;
+ }
+ }
+
sdio_writel(func, WHLPCR_FW_OWN_REQ_SET, MCR_WHLPCR, NULL);

err = readx_poll_timeout(mt76s_read_pcr, &dev->mt76, status,
!(status & WHLPCR_IS_DRIVER_OWN), 2000, 1000000);
sdio_release_host(func);

+err:
if (err < 0) {
dev_err(dev->mt76.dev, "firmware own failed\n");
clear_bit(MT76_STATE_PM, &mphy->state);
diff --git a/drivers/net/wireless/mediatek/mt76/sdio.h b/drivers/net/wireless/mediatek/mt76/sdio.h
index 99db4ad93b7c..27d5d2077eba 100644
--- a/drivers/net/wireless/mediatek/mt76/sdio.h
+++ b/drivers/net/wireless/mediatek/mt76/sdio.h
@@ -65,6 +65,7 @@
#define MCR_H2DSM0R 0x0070
#define H2D_SW_INT_READ BIT(16)
#define H2D_SW_INT_WRITE BIT(17)
+#define H2D_SW_INT_CLEAR_MAILBOX_ACK BIT(22)

#define MCR_H2DSM1R 0x0074
#define MCR_D2HRM0R 0x0078
@@ -109,6 +110,7 @@
#define MCR_H2DSM2R 0x0160 /* supported in CONNAC2 */
#define MCR_H2DSM3R 0x0164 /* supported in CONNAC2 */
#define MCR_D2HRM3R 0x0174 /* supported in CONNAC2 */
+#define D2HRM3R_IS_DRIVER_OWN BIT(0)
#define MCR_WTQCR8 0x0190 /* supported in CONNAC2 */
#define MCR_WTQCR9 0x0194 /* supported in CONNAC2 */
#define MCR_WTQCR10 0x0198 /* supported in CONNAC2 */
--
2.34.1