linux-kernel - [PATCH 3/7] mmc: sdhci-of-arasan: Skip Auto tuning for DDR50 mode in ZynqMP platform

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Date:   Tue, 15 Jun 2021 16:13:53 +0530
From:   Manish Narani <manish.narani@...inx.com>
To:     <michal.simek@...inx.com>, <adrian.hunter@...el.com>,
        <ulf.hansson@...aro.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Manish Narani <manish.narani@...inx.com>
Subject: [PATCH 3/7] mmc: sdhci-of-arasan: Skip Auto tuning for DDR50 mode in ZynqMP platform

ZynqMP platform does not perform auto tuning in DDR50 mode. Skip the
same while the card is operating in DDR50 mode.

Signed-off-by: Manish Narani <manish.narani@...inx.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index b13e719..1980d0b 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -894,6 +894,10 @@ static int arasan_zynqmp_execute_tuning(struct mmc_host *mmc, u32 opcode)
 							   NODE_SD_1;
 	int err;
 
+	/* ZynqMP SD controller does not perform auto tuning in DDR50 mode */
+	if (mmc->ios.timing == MMC_TIMING_UHS_DDR50)
+		return 0;
+
 	arasan_zynqmp_dll_reset(host, device_id);
 
 	err = sdhci_execute_tuning(mmc, opcode);
-- 
2.1.1