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Some UFS devices require delay after VCC power rail is turned off. Introduce a device quirk "DELAY_AFTER_LPM" to add 5ms delay after VCC power-off during suspend flow. Link: https://lore.kernel.org/r/20200729051840.31318-2-stanley.chu@mediatek.com Reviewed-by: Andy Teng <andy.teng@mediatek.com> Reviewed-by: Peter Wang <peter.wang@mediatek.com> Reviewed-by: Can Guo <cang@codeaurora.org> Acked-by: Avri Altman <Avri.Altman@wdc.com> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
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*/
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#ifndef _UFS_QUIRKS_H_
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#define _UFS_QUIRKS_H_
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/* return true if s1 is a prefix of s2 */
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#define STR_PRFX_EQUAL(s1, s2) !strncmp(s1, s2, strlen(s1))
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#define UFS_ANY_VENDOR 0xFFFF
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#define UFS_ANY_MODEL "ANY_MODEL"
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#define UFS_VENDOR_MICRON 0x12C
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#define UFS_VENDOR_SAMSUNG 0x1CE
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#define UFS_VENDOR_SKHYNIX 0x1AD
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#define UFS_VENDOR_TOSHIBA 0x198
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#define UFS_VENDOR_WDC 0x145
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/**
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* ufs_dev_fix - ufs device quirk info
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* @card: ufs card details
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* @quirk: device quirk
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*/
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struct ufs_dev_fix {
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u16 wmanufacturerid;
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u8 *model;
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unsigned int quirk;
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};
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#define END_FIX { }
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/* add specific device quirk */
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#define UFS_FIX(_vendor, _model, _quirk) { \
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.wmanufacturerid = (_vendor),\
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.model = (_model), \
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.quirk = (_quirk), \
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}
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/*
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* Some vendor's UFS device sends back to back NACs for the DL data frames
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* causing the host controller to raise the DFES error status. Sometimes
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* such UFS devices send back to back NAC without waiting for new
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* retransmitted DL frame from the host and in such cases it might be possible
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* the Host UniPro goes into bad state without raising the DFES error
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* interrupt. If this happens then all the pending commands would timeout
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* only after respective SW command (which is generally too large).
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*
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* We can workaround such device behaviour like this:
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* - As soon as SW sees the DL NAC error, it should schedule the error handler
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* - Error handler would sleep for 50ms to see if there are any fatal errors
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* raised by UFS controller.
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* - If there are fatal errors then SW does normal error recovery.
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* - If there are no fatal errors then SW sends the NOP command to device
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* to check if link is alive.
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* - If NOP command times out, SW does normal error recovery
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* - If NOP command succeed, skip the error handling.
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*
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* If DL NAC error is seen multiple times with some vendor's UFS devices then
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* enable this quirk to initiate quick error recovery and also silence related
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* error logs to reduce spamming of kernel logs.
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*/
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#define UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS (1 << 2)
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/*
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* Few Toshiba UFS device models advertise RX_MIN_ACTIVATETIME_CAPABILITY as
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* 600us which may not be enough for reliable hibern8 exit hardware sequence
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* from UFS device.
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* To workaround this issue, host should set its PA_TACTIVATE time to 1ms even
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* if device advertises RX_MIN_ACTIVATETIME_CAPABILITY less than 1ms.
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*/
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#define UFS_DEVICE_QUIRK_PA_TACTIVATE (1 << 4)
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/*
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* It seems some UFS devices may keep drawing more than sleep current
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* (atleast for 500us) from UFS rails (especially from VCCQ rail).
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* To avoid this situation, add 2ms delay before putting these UFS
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* rails in LPM mode.
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*/
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#define UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM (1 << 6)
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/*
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* Some UFS devices require host PA_TACTIVATE to be lower than device
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* PA_TACTIVATE, enabling this quirk ensure this.
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*/
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#define UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE (1 << 7)
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/*
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* The max. value PA_SaveConfigTime is 250 (10us) but this is not enough for
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* some vendors.
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* Gear switch from PWM to HS may fail even with this max. PA_SaveConfigTime.
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* Gear switch can be issued by host controller as an error recovery and any
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* software delay will not help on this case so we need to increase
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* PA_SaveConfigTime to >32us as per vendor recommendation.
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*/
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#define UFS_DEVICE_QUIRK_HOST_PA_SAVECONFIGTIME (1 << 8)
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/*
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* Some UFS devices require VS_DebugSaveConfigTime is 0x10,
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* enabling this quirk ensure this.
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*/
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#define UFS_DEVICE_QUIRK_HOST_VS_DEBUGSAVECONFIGTIME (1 << 9)
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/*
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* Some pre-3.1 UFS devices can support extended features by upgrading
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* the firmware. Enable this quirk to make UFS core driver probe and enable
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* supported features on such devices.
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*/
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#define UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES (1 << 10)
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/*
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* Some UFS devices require delay after VCC power rail is turned-off.
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* Enable this quirk to introduce 5ms delays after VCC power-off during
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* suspend flow.
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*/
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#define UFS_DEVICE_QUIRK_DELAY_AFTER_LPM (1 << 11)
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#endif /* UFS_QUIRKS_H_ */
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