target/linux/mediatek/patches-4.14/0158-mmc-mediatek-add-latch-ck-support.patch

   1 From de14d1d0dc7ecf5c3e7e2a591b4f14e688fa52e6 Mon Sep 17 00:00:00 2001
   2 From: Chaotian Jing <chaotian.jing@mediatek.com>
   3 Date: Mon, 16 Oct 2017 09:46:37 +0800
   4 Subject: [PATCH 158/224] mmc: mediatek: add latch-ck support
   5
   6 some platform(eg.mt2701) does not support "stop clk fix", in
   7 this case, need set correct latch-ck to avoid crc error caused
   8 by stop clock block-internally.
   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 | 6 ++++++
  15  1 file changed, 6 insertions(+)
  16
  17 diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
  18 index a2f26c9b17b4..d75a93d6803f 100644
  19 --- a/drivers/mmc/host/mtk-sd.c
  20 +++ b/drivers/mmc/host/mtk-sd.c
  21 @@ -378,6 +378,7 @@ struct msdc_host {
  22         u32 sclk;               /* SD/MS bus clock frequency */
  23         unsigned char timing;
  24         bool vqmmc_enabled;
  25 +       u32 latch_ck;
  26         u32 hs400_ds_delay;
  27         u32 hs200_cmd_int_delay; /* cmd internal delay for HS200/SDR104 */
  28         u32 hs400_cmd_int_delay; /* cmd internal delay for HS400 */
  29 @@ -1661,6 +1662,8 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
  30         u32 tune_reg = host->dev_comp->pad_tune_reg;
  31         int i, ret;
  32
  33 +       sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_INT_DAT_LATCH_CK_SEL,
  34 +                     host->latch_ck);
  35         sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_DSPL);
  36         sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_W_DSPL);
  37         for (i = 0 ; i < PAD_DELAY_MAX; i++) {
  38 @@ -1773,6 +1776,9 @@ static const struct mmc_host_ops mt_msdc_ops = {
  39  static void msdc_of_property_parse(struct platform_device *pdev,
  40                                    struct msdc_host *host)
  41  {
  42 +       of_property_read_u32(pdev->dev.of_node, "mediatek,latch-ck",
  43 +                            &host->latch_ck);
  44 +
  45         of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",
  46                              &host->hs400_ds_delay);
  47
  48 --
  49 2.11.0
  50