target/linux/layerscape/patches-5.4/816-sdhc-0003-LF-605-mmc-sdhci-of-esdhc-update-tuning-erratum-A-00.patch

   1 From f3d460fb85677a5f62324771e5715ceb11726ecc Mon Sep 17 00:00:00 2001
   2 From: Yangbo Lu <yangbo.lu@nxp.com>
   3 Date: Thu, 12 Dec 2019 15:52:19 +0800
   4 Subject: [PATCH] LF-605 mmc: sdhci-of-esdhc: update tuning erratum A-008171
   5
   6 There is an official update for eSDHC tuning erratum A-008171.
   7 This patch is to implement the changes,
   8 - Affect all revisions of SoC.
   9 - Changes for tuning window checking.
  10 - Hardware hits a new condition that tuning succeeds although
  11   the eSDHC might not have tuned properly for type2 SoCs
  12   (soc_tuning_erratum_type2[] array in driver). So check
  13   tuning window after tuning succeeds.
  14
  15 Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
  16 Acked-by: Adrian Hunter <adrian.hunter@intel.com>
  17 ---
  18  drivers/mmc/host/sdhci-of-esdhc.c | 39 ++++++++++++++++++++++++++-------------
  19  1 file changed, 26 insertions(+), 13 deletions(-)
  20
  21 --- a/drivers/mmc/host/sdhci-of-esdhc.c
  22 +++ b/drivers/mmc/host/sdhci-of-esdhc.c
  23 @@ -854,20 +854,20 @@ static int esdhc_signal_voltage_switch(s
  24  }
  25
  26  static struct soc_device_attribute soc_tuning_erratum_type1[] = {
  27 -       { .family = "QorIQ T1023", .revision = "1.0", },
  28 -       { .family = "QorIQ T1040", .revision = "1.0", },
  29 -       { .family = "QorIQ T2080", .revision = "1.0", },
  30 -       { .family = "QorIQ LS1021A", .revision = "1.0", },
  31 +       { .family = "QorIQ T1023", },
  32 +       { .family = "QorIQ T1040", },
  33 +       { .family = "QorIQ T2080", },
  34 +       { .family = "QorIQ LS1021A", },
  35         { },
  36  };
  37
  38  static struct soc_device_attribute soc_tuning_erratum_type2[] = {
  39 -       { .family = "QorIQ LS1012A", .revision = "1.0", },
  40 -       { .family = "QorIQ LS1043A", .revision = "1.*", },
  41 -       { .family = "QorIQ LS1046A", .revision = "1.0", },
  42 -       { .family = "QorIQ LS1080A", .revision = "1.0", },
  43 -       { .family = "QorIQ LS2080A", .revision = "1.0", },
  44 -       { .family = "QorIQ LA1575A", .revision = "1.0", },
  45 +       { .family = "QorIQ LS1012A", },
  46 +       { .family = "QorIQ LS1043A", },
  47 +       { .family = "QorIQ LS1046A", },
  48 +       { .family = "QorIQ LS1080A", },
  49 +       { .family = "QorIQ LS2080A", },
  50 +       { .family = "QorIQ LA1575A", },
  51         { },
  52  };
  53
  54 @@ -935,13 +935,13 @@ static void esdhc_prepare_sw_tuning(stru
  55         /* Write 32'hFFFF_FFFF to IRQSTAT register */
  56         sdhci_writel(host, 0xFFFFFFFF, SDHCI_INT_STATUS);
  57
  58 -       /* If TBSTAT[15:8]-TBSTAT[7:0] > 4 * div_ratio
  59 -        * or TBSTAT[7:0]-TBSTAT[15:8] > 4 * div_ratio,
  60 +       /* If TBSTAT[15:8]-TBSTAT[7:0] > (4 * div_ratio) + 2
  61 +        * or TBSTAT[7:0]-TBSTAT[15:8] > (4 * div_ratio) + 2,
  62          * then program TBPTR[TB_WNDW_END_PTR] = 4 * div_ratio
  63          * and program TBPTR[TB_WNDW_START_PTR] = 8 * div_ratio.
  64          */
  65
  66 -       if (abs(start_ptr - end_ptr) > (4 * esdhc->div_ratio)) {
  67 +       if (abs(start_ptr - end_ptr) > (4 * esdhc->div_ratio + 2)) {
  68                 *window_start = 8 * esdhc->div_ratio;
  69                 *window_end = 4 * esdhc->div_ratio;
  70         } else {
  71 @@ -1014,6 +1014,19 @@ static int esdhc_execute_tuning(struct m
  72                 if (ret)
  73                         break;
  74
  75 +               /* For type2 affected platforms of the tuning erratum,
  76 +                * tuning may succeed although eSDHC might not have
  77 +                * tuned properly. Need to check tuning window.
  78 +                */
  79 +               if (esdhc->quirk_tuning_erratum_type2 &&
  80 +                   !host->tuning_err) {
  81 +                       esdhc_tuning_window_ptr(host, &window_start,
  82 +                                               &window_end);
  83 +                       if (abs(window_start - window_end) >
  84 +                           (4 * esdhc->div_ratio + 2))
  85 +                               host->tuning_err = -EAGAIN;
  86 +               }
  87 +
  88                 /* If HW tuning fails and triggers erratum,
  89                  * try workaround.
  90                  */