Re: [PATCH v4 5/5] arm64: dts: Add node for ufs exynos7

["Paweł Chmiel" <pawel.mikolaj.chmiel@gmail.com>]

On Sat, 2020-04-04 at 23:45 +0530, Alim Akhtar wrote:
Hi Alim,
> Hi Pawel,
> 
> > -----Original Message-----
> > From: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> > Sent: 03 April 2020 22:22
> > To: Alim Akhtar <alim.akhtar@samsung.com>; robh+dt@kernel.org;
> > devicetree@vger.kernel.org; linux-scsi@vger.kernel.org
> > Cc: krzk@kernel.org; avri.altman@wdc.com; martin.petersen@oracle.com;
> > kwmad.kim@samsung.com; stanley.chu@mediatek.com;
> > cang@codeaurora.org; linux-samsung-soc@vger.kernel.org; linux-arm-
> > kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> > Subject: Re: [PATCH v4 5/5] arm64: dts: Add node for ufs exynos7
> > 
> > Hi Alim
> > 
> > Looking at vendor sources, my device is using the same gpios for
> > urfs_rst_n and ufs_refclk_out like Espresso (with one difference -
> > ufs_rst_n shouldn't be pulled up).
> > 
> > About regulators (it would be easier if dts would have all regulators).
> > It's also using s2mps15 as Espresso, but it vendor dts had only 8 (of
> > 10 possible bucks, one missing was for UFS) and 14 ldos (of 27
> > possible), where almost all rails are connected to something.
> > 
> > I'm wondering how it's working on Espresso, because when adding correct
> > regulators for ufs (vccq = buck10 from s2mps15, always enabled for
> > testing plus vccq2 and vccq = two regulators enabled by one gpio,
> > enabled at boot by firmware), ufs wasn't still working because it was
> > then failing at defer probe (s2mps15 was probed after ufs)
> > 
> > [    0.962482] exynos-ufshc 15570000.ufs: ufshcd_get_vreg: vccq get
> > failed, err=-517
> > 
> As I said, this is very specific to the board, on Espresso we have LDO12 connected to UFS_RESETn.
> Either make all of them as always-on, or just disabled s2mps15 
> (default voltage supply should be ok, unless bootloader on your board does have messed too much with PMIC)
>  
> > After that boot would just stop/hang.
> > 
> > After making a "dirty fix" by making s2mps15 regulator driver use
> > subsys_initcall (like in vendor sources) and ufs late_initcall (to give
> > it more time to setup and get it working and solve it later),
> > i had to mark following clocks as CLK_IGNORE_UNUSED to be able to bring
> > link up (it replicates setting done by vendor kernel, which enables
> > them on boot):
> > - "phyclk_ufs20_rx1_symbol_user"
> > - "phyclk_ufs20_rx0_symbol_user"
> > - "phyclk_ufs20_tx0_symbol_user"
> > 
> Coming to these clocks, all these are supplied by default, my best guess is since you are using an actual product (S6 edge), they might have optimized for power saving 
> And most likely all clock might be  gated initially. In my case all are set to default.
> I have attached a small change in the exynos7 dts and phy driver clock handling, please try this attached patch and let me know if this helps in removing some of your hacks.
> In the later SoCs these clocks are not in this form, so I didn't included in my current patch set, If this works for your, will add as an optional for exynos7/7420.
> I also assume you are using clk-exynos7.c and my posted ufs driver.
Yes, i'm using clk-exynos7 (and other exynos7 drivers/dts/etc).
It would be great if someone could say how exynos7 and exynos7420 are
similar. For now it looks like that only difference is that exynos7 has
only 4 cores (a57) where 7420 has 4xa53 + 4xa57.
It would be very valuable information for me so i could know how much i
could reuse my device.
> 
> > Now it's able to bring both device and link, but it fails at
> > ufshcd_uic_change_pwr_mode.
> > 
> Can you please use the exact ufs and ufs-phy device node as in my patch?
With Your patch + removed my changes to clocks (removed fix for wrong
clock order in dts + removed CLK_IGNORE_UNUSED from symbol clocks in
clk-exynos7) it's finally able to detect my UFS device!! 

(but of fails later...with constant error spam in kernel log).

[    1.383481] exynos-ufshc 15570000.ufs: ufshcd_populate_vreg: Unable
to find vdd-hba-supply regulator, assuming enabled
[    1.390060] exynos-ufshc 15570000.ufs: ufshcd_populate_vreg: unable
to find vcc-max-microamp
[    1.398465] exynos-ufshc 15570000.ufs: ufshcd_populate_vreg: unable
to find vccq-max-microamp
[    1.406968] exynos-ufshc 15570000.ufs: ufshcd_populate_vreg: unable
to find vccq2-max-microamp
[    1.415569] exynos-ufshc 15570000.ufs: ufshcd_init_clocks: clk:
core_clk, rate: 100000000
[    1.423715] exynos-ufshc 15570000.ufs: ufshcd_init_clocks: clk:
sclk_unipro_main, rate: 167000000
[    1.432569] exynos-ufshc 15570000.ufs: __ufshcd_setup_clocks: clk:
core_clk enabled
[    1.440205] exynos-ufshc 15570000.ufs: __ufshcd_setup_clocks: clk:
sclk_unipro_main enabled
[    1.449613] scsi host0: ufshcd
[    1.452179] samsung-ufs-phy 15571800.ufs-phy: MPHY ref_clk_rate =
26000000
[    1.458448] samsung-ufs-phy 15571800.ufs-phy: MPHY
ref_parent_clk_rate = 26000000
[    1.487288] exynos-ufshc 15570000.ufs: ufshcd_print_pwr_info:[RX,
TX]: gear=[1, 1], lane[1, 1], pwr[SLOWAUTO_MODE, SLOWAUTO_MODE], rate =
0
[    2.025569] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd041 val
0x1fff error code 1
[    2.025715] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd041 val
0x1fff failed 0 retries
[    2.025880] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd042 val
0xffff error code 1
[    2.027354] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd042 val
0xffff failed 0 retries
[    2.035583] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd043 val
0x7fff error code 1
[    2.043465] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd043 val
0x7fff failed 0 retries
[    2.054049] exynos-ufshc 15570000.ufs: Power mode change 0 : Fast
series_B G_2 L_2
[    2.059261] exynos-ufshc 15570000.ufs: ufshcd_print_pwr_info:[RX,
TX]: gear=[2, 2], lane[2, 2], pwr[FAST MODE, FAST MODE], rate = 2
[    2.071307] exynos-ufshc 15570000.ufs: ufshcd_init_icc_levels:
setting icc_level 0x0
[    2.081624] exynos-ufshc 15570000.ufs: ufshcd_set_queue_depth:
activate tcq with queue depth 1
[    2.087576] scsi 0:0:0:49488: scsi_add_lun: correcting incorrect
peripheral device type 0x0 for W-LUN 0x            c150hN
[    2.098400] scsi 0:0:0:49488: Well-known LUN    SAMSUNG  KLUBG4G1BD-
E0B1  0200 PQ: 0 ANSI: 6
[    2.107585] exynos-ufshc 15570000.ufs: ufshcd_set_queue_depth:
activate tcq with queue depth 16
[    2.115588] scsi 0:0:0:49476: scsi_add_lun: correcting incorrect
peripheral device type 0x0 for W-LUN 0x            c144hN
[    2.126519] scsi 0:0:0:49476: Well-known LUN    SAMSUNG  KLUBG4G1BD-
E0B1  0200 PQ: 0 ANSI: 6
[    2.135534] exynos-ufshc 15570000.ufs: ufshcd_set_queue_depth:
activate tcq with queue depth 1
[    2.143612] scsi 0:0:0:49456: scsi_add_lun: correcting incorrect
peripheral device type 0x0 for W-LUN 0x            c130hN
[    2.154543] scsi 0:0:0:49456: Well-known LUN    SAMSUNG  KLUBG4G1BD-
E0B1  0200 PQ: 0 ANSI: 6
[    2.163597] exynos-ufshc 15570000.ufs: ufshcd_set_queue_depth:
activate tcq with queue depth 16
[    2.171721] scsi 0:0:0:0: Direct-Access     SAMSUNG  KLUBG4G1BD-
E0B1  0200 PQ: 0 ANSI: 6
[    2.180352] exynos-ufshc 15570000.ufs: OCS error from controller = 7
for tag 0
[    2.186921] host_regs: 00000000: 0383ff0f 00000000 00000200 00000000
[    2.193230] host_regs: 00000010: 00000101 00007fce 00000c96 00000000
[    2.199565] host_regs: 00000020: 00000000 00030e75 00000000 00000000
[    2.205899] host_regs: 00000030: 0000010f 00000000 80000010 00000000
[    2.212234] host_regs: 00000040: 00000000 00000000 00000000 00000000
[    2.218568] host_regs: 00000050: f8d64000 00000000 00000000 00000000
[    2.224903] host_regs: 00000060: 00000001 00000000 00000000 00000000
[    2.231237] host_regs: 00000070: f8da2000 00000000 00000000 00000000
[    2.237572] host_regs: 00000080: 00000001 00000000 00000000 00000000
[    2.243907] host_regs: 00000090: 00000002 95190000 00000000 00000000
[    2.250242] exynos-ufshc 15570000.ufs: hba->ufs_version = 0x200,
hba->capabilities = 0x383ff0f

Full bootlog 
https://gist.github.com/PabloPL/0bcb24492f4ab6e9703c2a4ea20ceb18
kernel source: https://github.com/PabloPL/linux/tree/ufs-mainline
dts file: exynos7-zeroflt.dts (it should be zerolt, but will be
fixed/changed later).

Thanks
> 
> > [    1.411547] exynos-ufshc 15570000.ufs: ufshcd_init_clocks: clk:
> > core_clk, rate: 100000000
> > [    1.419698] exynos-ufshc 15570000.ufs: ufshcd_init_clocks: clk:
> > sclk_unipro_main, rate: 167000000
> > [    1.428550] exynos-ufshc 15570000.ufs: __ufshcd_setup_clocks: clk:
> > core_clk enabled
> > [    1.436200] exynos-ufshc 15570000.ufs: __ufshcd_setup_clocks: clk:
> > sclk_unipro_main enabled
> > [    1.445704] scsi host0: ufshcd
> > [    1.465684] exynos-ufshc 15570000.ufs: ufshcd_print_pwr_info:[RX,
> > TX]: gear=[1, 1], lane[1, 1], pwr[SLOWAUTO_MODE, SLOWAUTO_MODE], rate
> > =
> > 0
> > [    2.023699] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd041 val
> > 0x1fff error code 1
> > [    2.023846] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd041 val
> > 0x1fff failed 0 retries
> > [    2.024025] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd042 val
> > 0xffff error code 1
> > [    2.025457] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd042 val
> > 0xffff failed 0 retries
> > [    2.033777] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd043 val
> > 0x7fff error code 1
> > [    2.041607] exynos-ufshc 15570000.ufs: dme-set: attr-id 0xd043 val
> > 0x7fff failed 0 retries
> > [    2.067809] exynos-ufshc 15570000.ufs: pwr ctrl cmd 0x2 failed, host
> > upmcrs:0x5
> > [    2.067953] exynos-ufshc 15570000.ufs: UFS Host state=0
> > [    2.068056] exynos-ufshc 15570000.ufs: outstanding reqs=0x0
> > tasks=0x0
> > [    2.068759] exynos-ufshc 15570000.ufs: saved_err=0x0,
> > saved_uic_err=0x0
> > [    2.075368] exynos-ufshc 15570000.ufs: Device power mode=1, UIC link
> > state=1
> > [    2.082392] exynos-ufshc 15570000.ufs: PM in progress=0, sys.
> > suspended=0
> > [    2.089158] exynos-ufshc 15570000.ufs: Auto BKOPS=0, Host self-
> > block=0
> > [    2.095667] exynos-ufshc 15570000.ufs: Clk gate=1
> > [    2.100354] exynos-ufshc 15570000.ufs: error handling flags=0x0,
> > req. abort count=0
> > [    2.107987] exynos-ufshc 15570000.ufs: Host capabilities=0x383ff0f,
> > caps=0x0
> > [    2.115018] exynos-ufshc 15570000.ufs: quirks=0x780, dev.
> > quirks=0xc4
> > [    2.121443] exynos-ufshc 15570000.ufs: ufshcd_print_pwr_info:[RX,
> > TX]: gear=[1, 1], lane[1, 1], pwr[SLOWAUTO_MODE, SLOWAUTO_MODE], rate
> > =
> > 0
> > [    2.133960] host_regs: 00000000: 0383ff0f 00000000 00000200 00000000
> > [    2.140268] host_regs: 00000010: 00000101 00007fce 00000000 00000000
> > [    2.146604] host_regs: 00000020: 00000000 00030a75 00000000 00000000
> > [    2.152940] host_regs: 00000030: 0000050f 00000000 80000010 00000000
> > [    2.159271] host_regs: 00000040: 00000000 00000000 00000000 00000000
> > [    2.165609] host_regs: 00000050: f9587000 00000000 00000000 00000000
> > [    2.171944] host_regs: 00000060: 00000001 00000000 00000000 00000000
> > [    2.178278] host_regs: 00000070: f958a000 00000000 00000000 00000000
> > [    2.184609] host_regs: 00000080: 00000001 00000000 00000000 00000000
> > [    2.190945] host_regs: 00000090: 00000002 15710000 00000000 00000000
> > [    2.197282] exynos-ufshc 15570000.ufs: hba->ufs_version = 0x200,
> > hba->capabilities = 0x383ff0f
> > [    2.205869] exynos-ufshc 15570000.ufs: hba->outstanding_reqs = 0x0,
> > hba->outstanding_tasks = 0x0
> > [    2.214636] exynos-ufshc 15570000.ufs: last_hibern8_exit_tstamp at 0
> > us, hibern8_exit_cnt = 0
> > [    2.223141] exynos-ufshc 15570000.ufs: No record of pa_err
> > [    2.228606] exynos-ufshc 15570000.ufs: No record of dl_err
> > [    2.234071] exynos-ufshc 15570000.ufs: No record of nl_err
> > [    2.239540] exynos-ufshc 15570000.ufs: No record of tl_err
> > [    2.245007] exynos-ufshc 15570000.ufs: No record of dme_err
> > [    2.250558] exynos-ufshc 15570000.ufs: No record of auto_hibern8_err
> > [    2.256895] exynos-ufshc 15570000.ufs: No record of fatal_err
> > [    2.262624] exynos-ufshc 15570000.ufs: No record of
> > link_startup_fail
> > [    2.269044] exynos-ufshc 15570000.ufs: No record of resume_fail
> > [    2.274942] exynos-ufshc 15570000.ufs: No record of suspend_fail
> > [    2.280931] exynos-ufshc 15570000.ufs: No record of dev_reset
> > [    2.286659] exynos-ufshc 15570000.ufs: No record of host_reset
> > [    2.292475] exynos-ufshc 15570000.ufs: No record of task_abort
> > [    2.298290] exynos-ufshc 15570000.ufs: ufshcd_change_power_mode:
> > power mode change failed 5
> > [    2.306619] exynos-ufshc 15570000.ufs: ufshcd_probe_hba: Failed
> > setting power mode, err = 5
> > [    2.315144] exynos-ufshc 15570000.ufs: __ufshcd_setup_clocks: clk:
> > core_clk disabled
> > 
> > And here boot would just stop/hang.
> > 
> > Thanks for all hints.
> > 
> > > 
> > > > > > Also looking at clk-exynos7 driver seems to confirm this.
> > > > > > 
> > > > > > > +		};
> > > > > > > +
> > > > > > >  		usbdrd_phy: phy@15500000 {
> > > > > > >  			compatible = "samsung,exynos7-usbdrd-phy";
> > > > > > >  			reg = <0x15500000 0x100>;
> 
>