target/linux/mediatek/patches-4.14/0160-mmc-mediatek-perfer-to-use-rise-edge-latching-for-cm.patch

   1 From 81fdc4983e33ef01935a9bf01187951aad34e2ac Mon Sep 17 00:00:00 2001
   2 From: Chaotian Jing <chaotian.jing@mediatek.com>
   3 Date: Mon, 16 Oct 2017 09:46:39 +0800
   4 Subject: [PATCH 160/224] mmc: mediatek: perfer to use rise edge latching for
   5  cmd line
   6
   7 data lines have applied to perfer to use rise edge, also need
   8 apply it to cmd line.
   9
  10 Signed-off-by: Chaotian Jing <chaotian.jing@mediatek.com>
  11 Tested-by: Sean Wang <sean.wang@mediatek.com>
  12 Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
  13 ---
  14  drivers/mmc/host/mtk-sd.c | 3 ++-
  15  1 file changed, 2 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/mmc/host/mtk-sd.c
  18 +++ b/drivers/mmc/host/mtk-sd.c
  19 @@ -1550,7 +1550,8 @@ static int msdc_tune_response(struct mmc
  20         }
  21         final_rise_delay = get_best_delay(host, rise_delay);
  22         /* if rising edge has enough margin, then do not scan falling edge */
  23 -       if (final_rise_delay.maxlen >= 12 && final_rise_delay.start < 4)
  24 +       if (final_rise_delay.maxlen >= 12 ||
  25 +           (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
  26                 goto skip_fall;
  27
  28         sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);