linux-kernel - [<PATCH v1> 7/9] mmc: core: Skip frequency retries for SDCC slots

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Message-Id: <68b936a67e67cd25597915cbd76b73ed046d1ce4.1576540908.git.nguyenb@codeaurora.org>
Date:   Mon, 16 Dec 2019 18:50:40 -0800
From:   "Bao D. Nguyen" <nguyenb@...eaurora.org>
To:     ulf.hansson@...aro.org, robh+dt@...nel.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        asutoshd@...eaurora.org, cang@...eaurora.org,
        Sujith Reddy Thumma <sthumma@...eaurora.org>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Xiaonian Wang <xiaonian@...eaurora.org>,
        "Bao D. Nguyen" <nguyenb@...eaurora.org>
Subject: [<PATCH v1> 7/9] mmc: core: Skip frequency retries for SDCC slots

From: Sujith Reddy Thumma <sthumma@...eaurora.org>

Qualcomm SDCC controller supports minimum SD clock frequency
which is required for card initialization. This information is
exported through platform data for each SDCC controller. There is
no need of retrying higher frequencies than the minimum supported
by controller for Qualcomm chipsets which inturn add delay in
detection process if there is no card during suspend/resume cycles.
Hence, skip multiple frequency retries.

Signed-off-by: Sujith Reddy Thumma <sthumma@...eaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
Signed-off-by: Xiaonian Wang <xiaonian@...eaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@...eaurora.org>
---
 drivers/mmc/core/core.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 1e37f78..38b0cec 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2281,7 +2281,6 @@ void mmc_rescan(struct work_struct *work)
 {
 	struct mmc_host *host =
 		container_of(work, struct mmc_host, detect.work);
-	int i;
 
 	if (host->rescan_disable)
 		return;
@@ -2332,13 +2331,7 @@ void mmc_rescan(struct work_struct *work)
 		mmc_release_host(host);
 		goto out;
 	}
-
-	for (i = 0; i < ARRAY_SIZE(freqs); i++) {
-		if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
-			break;
-		if (freqs[i] <= host->f_min)
-			break;
-	}
+	mmc_rescan_try_freq(host, host->f_min);
 	mmc_release_host(host);
 
  out:
-- 
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a Linux Foundation Collaborative Project