package/boot/uboot-mvebu/patches/013-mmc-xenon_sdhci-remove-wait_dat0-SDHCI-OP.patch

   1 From 0f3466f52fbacce67e147b9234e6323edff26a6d Mon Sep 17 00:00:00 2001
   2 From: Robert Marko <robert.marko@sartura.hr>
   3 Date: Fri, 11 Mar 2022 19:14:07 +0100
   4 Subject: [PATCH] mmc: xenon_sdhci: remove wait_dat0 SDHCI OP
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Generic SDHCI driver received support for checking the busy status by
  10 polling the DAT[0] level instead of waiting for the worst MMC switch time.
  11
  12 Unfortunately, it appears that this does not work for Xenon controllers
  13 despite being a part of the standard SDHCI registers and the Armada 3720
  14 datasheet itself telling that BIT(20) is useful for detecting the DAT[0]
  15 busy signal.
  16
  17 I have tried increasing the timeout value, but I have newer managed to
  18 catch DAT_LEVEL bits change from 0 at all.
  19
  20 This issue appears to hit most if not all SoC-s supported by Xenon driver,
  21 at least A3720, A8040 and CN9130 have non working eMMC currently.
  22
  23 So, until a better solution is found drop the wait_dat0 OP for Xenon.
  24 I was able to only test it on A3720, but it should work for others as well.
  25
  26 Fixes: 40e6f52454fc ("drivers: mmc: Add wait_dat0 support for sdhci driver")
  27 Signed-off-by: Robert Marko <robert.marko@sartura.hr>
  28 Reviewed-by: Marek Behún <marek.behun@nic.cz>
  29 Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
  30 Reviewed-by: Stefan Roese <sr@denx.de>
  31 ---
  32  drivers/mmc/xenon_sdhci.c | 7 ++++++-
  33  1 file changed, 6 insertions(+), 1 deletion(-)
  34
  35 --- a/drivers/mmc/xenon_sdhci.c
  36 +++ b/drivers/mmc/xenon_sdhci.c
  37 @@ -439,6 +439,8 @@ static const struct sdhci_ops xenon_sdhc
  38         .set_ios_post = xenon_sdhci_set_ios_post
  39  };
  40
  41 +static struct dm_mmc_ops xenon_mmc_ops;
  42 +
  43  static int xenon_sdhci_probe(struct udevice *dev)
  44  {
  45         struct xenon_sdhci_plat *plat = dev_get_plat(dev);
  46 @@ -452,6 +454,9 @@ static int xenon_sdhci_probe(struct udev
  47         host->mmc->dev = dev;
  48         upriv->mmc = host->mmc;
  49
  50 +       xenon_mmc_ops = sdhci_ops;
  51 +       xenon_mmc_ops.wait_dat0 = NULL;
  52 +
  53         /* Set quirks */
  54         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD | SDHCI_QUIRK_32BIT_DMA_ADDR;
  55
  56 @@ -568,7 +573,7 @@ U_BOOT_DRIVER(xenon_sdhci_drv) = {
  57         .id             = UCLASS_MMC,
  58         .of_match       = xenon_sdhci_ids,
  59         .of_to_plat = xenon_sdhci_of_to_plat,
  60 -       .ops            = &sdhci_ops,
  61 +       .ops            = &xenon_mmc_ops,
  62         .bind           = xenon_sdhci_bind,
  63         .probe          = xenon_sdhci_probe,
  64         .remove         = xenon_sdhci_remove,