drivers/scsi/ufs/ufs_quirks.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #ifndef _UFS_QUIRKS_H_
   7 #define _UFS_QUIRKS_H_
   8
   9 /* return true if s1 is a prefix of s2 */
  10 #define STR_PRFX_EQUAL(s1, s2) !strncmp(s1, s2, strlen(s1))
  11
  12 #define UFS_ANY_VENDOR 0xFFFF
  13 #define UFS_ANY_MODEL  "ANY_MODEL"
  14
  15 #define UFS_VENDOR_TOSHIBA     0x198
  16 #define UFS_VENDOR_SAMSUNG     0x1CE
  17 #define UFS_VENDOR_SKHYNIX     0x1AD
  18
  19 /**
  20  * ufs_dev_fix - ufs device quirk info
  21  * @card: ufs card details
  22  * @quirk: device quirk
  23  */
  24 struct ufs_dev_fix {
  25         struct ufs_dev_desc card;
  26         unsigned int quirk;
  27 };
  28
  29 #define END_FIX { { 0 }, 0 }
  30
  31 /* add specific device quirk */
  32 #define UFS_FIX(_vendor, _model, _quirk) { \
  33         .card.wmanufacturerid = (_vendor),\
  34         .card.model = (_model),            \
  35         .quirk = (_quirk),                 \
  36 }
  37
  38 /*
  39  * Some vendor's UFS device sends back to back NACs for the DL data frames
  40  * causing the host controller to raise the DFES error status. Sometimes
  41  * such UFS devices send back to back NAC without waiting for new
  42  * retransmitted DL frame from the host and in such cases it might be possible
  43  * the Host UniPro goes into bad state without raising the DFES error
  44  * interrupt. If this happens then all the pending commands would timeout
  45  * only after respective SW command (which is generally too large).
  46  *
  47  * We can workaround such device behaviour like this:
  48  * - As soon as SW sees the DL NAC error, it should schedule the error handler
  49  * - Error handler would sleep for 50ms to see if there are any fatal errors
  50  *   raised by UFS controller.
  51  *    - If there are fatal errors then SW does normal error recovery.
  52  *    - If there are no fatal errors then SW sends the NOP command to device
  53  *      to check if link is alive.
  54  *        - If NOP command times out, SW does normal error recovery
  55  *        - If NOP command succeed, skip the error handling.
  56  *
  57  * If DL NAC error is seen multiple times with some vendor's UFS devices then
  58  * enable this quirk to initiate quick error recovery and also silence related
  59  * error logs to reduce spamming of kernel logs.
  60  */
  61 #define UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS (1 << 2)
  62
  63 /*
  64  * Few Toshiba UFS device models advertise RX_MIN_ACTIVATETIME_CAPABILITY as
  65  * 600us which may not be enough for reliable hibern8 exit hardware sequence
  66  * from UFS device.
  67  * To workaround this issue, host should set its PA_TACTIVATE time to 1ms even
  68  * if device advertises RX_MIN_ACTIVATETIME_CAPABILITY less than 1ms.
  69  */
  70 #define UFS_DEVICE_QUIRK_PA_TACTIVATE   (1 << 4)
  71
  72 /*
  73  * It seems some UFS devices may keep drawing more than sleep current
  74  * (atleast for 500us) from UFS rails (especially from VCCQ rail).
  75  * To avoid this situation, add 2ms delay before putting these UFS
  76  * rails in LPM mode.
  77  */
  78 #define UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM       (1 << 6)
  79
  80 /*
  81  * Some UFS devices require host PA_TACTIVATE to be lower than device
  82  * PA_TACTIVATE, enabling this quirk ensure this.
  83  */
  84 #define UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE      (1 << 7)
  85
  86 /*
  87  * The max. value PA_SaveConfigTime is 250 (10us) but this is not enough for
  88  * some vendors.
  89  * Gear switch from PWM to HS may fail even with this max. PA_SaveConfigTime.
  90  * Gear switch can be issued by host controller as an error recovery and any
  91  * software delay will not help on this case so we need to increase
  92  * PA_SaveConfigTime to >32us as per vendor recommendation.
  93  */
  94 #define UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME (1 << 8)
  95
  96 /*
  97  * Some UFS devices require VS_DebugSaveConfigTime is 0x10,
  98  * enabling this quirk ensure this.
  99  */
 100 #define UFS_DEVICE_QUIRK_HOST_VS_DEBUGSAVECONFIGTIME    (1 << 9)
 101
 102 #endif /* UFS_QUIRKS_H_ */