From 7321095ca39c8bb4da5e86f7a3fb8c22b47e5063 Mon Sep 17 00:00:00 2001
From: Wen Gong <wgong@codeaurora.org>
Date: Wed, 27 Nov 2019 06:04:13 +0000
Subject: [PATCH] ath10k: enable wow feature for sdio chip
Git-commit: 7321095ca39c8bb4da5e86f7a3fb8c22b47e5063
Patch-mainline: v5.6-rc1
References: jsc#SLE-13430

sdio does not support wow, this patch is to enable it. When system enter
sleep state, if wowlan is enabled, then sdio chip will keep power if
platform support keep power, after resume, it will not need to re-load
firmware again.

Tested with QCA6174 SDIO with firmware
WLAN.RMH.4.4.1-00029.

Signed-off-by: Wen Gong <wgong@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/ath/ath10k/sdio.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index 2e155bba2aa3..b8e249909699 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -1859,7 +1859,7 @@ static void ath10k_sdio_hif_stop(struct ath10k *ar)
 
 static int ath10k_sdio_hif_suspend(struct ath10k *ar)
 {
-	return -EOPNOTSUPP;
+	return 0;
 }
 
 static int ath10k_sdio_hif_resume(struct ath10k *ar)
@@ -2009,7 +2009,26 @@ static const struct ath10k_hif_ops ath10k_sdio_hif_ops = {
  */
 static int ath10k_sdio_pm_suspend(struct device *device)
 {
-	return 0;
+	struct sdio_func *func = dev_to_sdio_func(device);
+	struct ath10k_sdio *ar_sdio = sdio_get_drvdata(func);
+	struct ath10k *ar = ar_sdio->ar;
+	mmc_pm_flag_t pm_flag, pm_caps;
+	int ret;
+
+	if (!device_may_wakeup(ar->dev))
+		return 0;
+
+	pm_flag = MMC_PM_KEEP_POWER;
+
+	ret = sdio_set_host_pm_flags(func, pm_flag);
+	if (ret) {
+		pm_caps = sdio_get_host_pm_caps(func);
+		ath10k_warn(ar, "failed to set sdio host pm flags (0x%x, 0x%x): %d\n",
+			    pm_flag, pm_caps, ret);
+		return ret;
+	}
+
+	return ret;
 }
 
 static int ath10k_sdio_pm_resume(struct device *device)
-- 
2.16.4