linux-kernel - [PATCH 2/4] mmc: mmc: Add change to set controller to HS400 frequency in enhanced strobe

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Date:   Tue, 20 Dec 2016 11:23:17 +0530
From:   Ritesh Harjani <riteshh@...eaurora.org>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, shawn.lin@...k-chips.com,
        linux-kernel@...r.kernel.org, stummala@...eaurora.org,
        georgi.djakov@...aro.org, linux-arm-msm@...r.kernel.org,
        pramod.gurav@...aro.org, jeremymc@...hat.com,
        venkatg@...eaurora.org, asutoshd@...eaurora.org,
        Ritesh Harjani <riteshh@...eaurora.org>
Subject: [PATCH 2/4] mmc: mmc: Add change to set controller to HS400 frequency in enhanced strobe

Currently mmc_select_hs400es is not setting the desired frequency
before sending switch command. This makes CMD13 to timeout on
some controllers.
Thus add a change to set the desired HS400 frequency
in mmc_select_hs400es when the timing is switched to HS400.

Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
---
 drivers/mmc/core/mmc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index b61b52f9..eb69497 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1329,6 +1329,7 @@ static int mmc_select_hs400es(struct mmc_card *card)
 
 	/* Set host controller to HS400 timing and frequency */
 	mmc_set_timing(host, MMC_TIMING_MMC_HS400);
+	mmc_set_bus_speed(card);
 
 	/* Controller enable enhanced strobe function */
 	host->ios.enhanced_strobe = true;
-- 
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