Thread (25 messages) 25 messages, 5 authors, 2017-10-09
STALE3169d

[PATCH 12/12] mmc: mediatek: perfer to use rise edge latching for cmd line

From: chaotian.jing@mediatek.com (Chaotian Jing)
Date: 2017-09-12 09:08:57
Also in: linux-devicetree, linux-mediatek, linux-mmc, lkml
Subsystem: mediatek mmc/sd/sdio driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers: Chaotian Jing, Ulf Hansson, Linus Torvalds

data lines have applied to perfer to use rise edge, also need
apply it to cmd line.

Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
---
 drivers/mmc/host/mtk-sd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 49d4d79..9f21cdb 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1554,7 +1554,8 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
 	}
 	final_rise_delay = get_best_delay(host, rise_delay);
 	/* if rising edge has enough margin, then do not scan falling edge */
-	if (final_rise_delay.maxlen >= 12 && final_rise_delay.start < 4)
+	if (final_rise_delay.maxlen >= 12 ||
+	    (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
 		goto skip_fall;
 
 	sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
-- 
1.8.1.1.dirty
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