Received-SPF: pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org ADCE4601B4
From:   Wen Gong <wgong@codeaurora.org>
To:     ath10k@lists.infradead.org
Cc:     linux-wireless@vger.kernel.org
Subject: [PATCH] ath10k: remove mmc_hw_reset while hif power down
Date:   Sun, 28 Apr 2019 10:17:05 +0800
Message-Id: <1556417825-13713-1-git-send-email-wgong@codeaurora.org>
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

For sdio 3.0 chip, the clock will drop from 200M Hz to 50M Hz after load
ath10k driver, it is because mmc_hw_reset will reset the sdio's power,
then mmc will consider it as sdio 2.0 and drop the clock.

Remove mmc_hw_reset will avoid the drop of clock.

Tested with QCA6174 SDIO with firmware
WLAN.RMH.4.4.1-00007-QCARMSWP-1.

Signed-off-by: Wen Gong <wgong@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/sdio.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
index fae56c6..f1d2af8 100644
--- a/drivers/net/wireless/ath/ath10k/sdio.c
+++ b/drivers/net/wireless/ath/ath10k/sdio.c
@@ -1433,10 +1433,6 @@ static void ath10k_sdio_hif_power_down(struct ath10k *ar)
 		return;
 	}
 
-	ret = mmc_hw_reset(ar_sdio->func->card->host);
-	if (ret)
-		ath10k_warn(ar, "unable to reset sdio: %d\n", ret);
-
 	sdio_release_host(ar_sdio->func);
 
 	ar_sdio->is_disabled = true;
-- 
1.9.1