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Message-ID: <BN7PR12MB280258ABA104F0B420770183DC6F9@BN7PR12MB2802.namprd12.prod.outlook.com>
Date: Tue, 2 May 2023 11:40:45 +0000
From: "Mahapatra, Amit Kumar" <amit.kumar-mahapatra@....com>
To: Stefan Binding <sbinding@...nsource.cirrus.com>,
"broonie@...nel.org" <broonie@...nel.org>,
"tudor.ambarus@...aro.org" <tudor.ambarus@...aro.org>,
"pratyush@...nel.org" <pratyush@...nel.org>,
"michael@...le.cc" <michael@...le.cc>,
"miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
"richard@....at" <richard@....at>,
"vigneshr@...com" <vigneshr@...com>
CC: "git (AMD-Xilinx)" <git@....com>,
"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
"alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
"claudiu.beznea@...rochip.com" <claudiu.beznea@...rochip.com>,
"Simek, Michal" <michal.simek@....com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"amitrkcian2002@...il.com" <amitrkcian2002@...il.com>,
"patches@...nsource.cirrus.com" <patches@...nsource.cirrus.com>,
"vitalyr@...nsource.cirrus.com" <vitalyr@...nsource.cirrus.com>
Subject: RE: [PATCH V7 1/7] spi: Add stacked and parallel memories support in
SPI core
Hello Stefan,
> -----Original Message-----
> From: Stefan Binding <sbinding@...nsource.cirrus.com>
> Sent: Friday, April 28, 2023 7:38 PM
> To: Mahapatra, Amit Kumar <amit.kumar-mahapatra@....com>;
> broonie@...nel.org; tudor.ambarus@...aro.org; pratyush@...nel.org;
> michael@...le.cc; miquel.raynal@...tlin.com; richard@....at;
> vigneshr@...com
> Cc: git (AMD-Xilinx) <git@....com>; linux-spi@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-mtd@...ts.infradead.org;
> nicolas.ferre@...rochip.com; alexandre.belloni@...tlin.com;
> claudiu.beznea@...rochip.com; Simek, Michal <michal.simek@....com>;
> linux-arm-kernel@...ts.infradead.org; amitrkcian2002@...il.com;
> patches@...nsource.cirrus.com; vitalyr@...nsource.cirrus.com
> Subject: Re: [PATCH V7 1/7] spi: Add stacked and parallel memories support
> in SPI core
>
> Hi,
>
> On 27/04/2023 18:09, Mahapatra, Amit Kumar wrote:
> > Hello Stefan,
> >
> >> -----Original Message-----
> >> From: Stefan Binding <sbinding@...nsource.cirrus.com>
> >> Sent: Tuesday, April 25, 2023 5:50 PM
> >> To: Mahapatra, Amit Kumar <amit.kumar-mahapatra@....com>;
> >> broonie@...nel.org; tudor.ambarus@...aro.org; pratyush@...nel.org;
> >> michael@...le.cc; miquel.raynal@...tlin.com; richard@....at;
> >> vigneshr@...com
> >> Cc: git (AMD-Xilinx) <git@....com>; linux-spi@...r.kernel.org; linux-
> >> kernel@...r.kernel.org; linux-mtd@...ts.infradead.org;
> >> nicolas.ferre@...rochip.com; alexandre.belloni@...tlin.com;
> >> claudiu.beznea@...rochip.com; Simek, Michal
> <michal.simek@....com>;
> >> linux-arm-kernel@...ts.infradead.org; amitrkcian2002@...il.com;
> >> patches@...nsource.cirrus.com; vitalyr@...nsource.cirrus.com
> >> Subject: Re: [PATCH V7 1/7] spi: Add stacked and parallel memories
> >> support in SPI core
> >>
> >> Hi,
> >>
> >> On 20/04/2023 10:04, Mahapatra, Amit Kumar wrote:
> >>> Hello Stefan,
> >>>
> >>>> -----Original Message-----
> >>>> From: Stefan Binding <sbinding@...nsource.cirrus.com>
> >>>> Sent: Wednesday, April 12, 2023 8:33 PM
> >>>> To: Mahapatra, Amit Kumar <amit.kumar-mahapatra@....com>;
> >>>> broonie@...nel.org; tudor.ambarus@...aro.org; pratyush@...nel.org;
> >>>> michael@...le.cc; miquel.raynal@...tlin.com; richard@....at;
> >>>> vigneshr@...com
> >>>> Cc: git (AMD-Xilinx) <git@....com>; linux-spi@...r.kernel.org;
> >>>> linux- kernel@...r.kernel.org; linux-mtd@...ts.infradead.org;
> >>>> nicolas.ferre@...rochip.com; alexandre.belloni@...tlin.com;
> >>>> claudiu.beznea@...rochip.com; Simek, Michal
> >> <michal.simek@....com>;
> >>>> linux-arm-kernel@...ts.infradead.org; amitrkcian2002@...il.com;
> >>>> patches@...nsource.cirrus.com; vitalyr@...nsource.cirrus.com
> >>>> Subject: Re: [PATCH V7 1/7] spi: Add stacked and parallel memories
> >>>> support in SPI core
> >>>>
> >>>> Hi,
> >>>>
> >>>> On 11/04/2023 10:07, Mahapatra, Amit Kumar wrote:
> >>>>> Hello Stefan,
> >>>>>
> >>>>>> -----Original Message-----
> >>>>>> From: Stefan Binding <sbinding@...nsource.cirrus.com>
> >>>>>> Sent: Thursday, April 6, 2023 7:14 PM
> >>>>>> To: Mahapatra, Amit Kumar <amit.kumar-mahapatra@....com>;
> >>>>>> broonie@...nel.org; tudor.ambarus@...aro.org;
> >>>>>> pratyush@...nel.org; michael@...le.cc;
> miquel.raynal@...tlin.com;
> >>>>>> richard@....at; vigneshr@...com
> >>>>>> Cc: git (AMD-Xilinx) <git@....com>; linux-spi@...r.kernel.org;
> >>>>>> linux- kernel@...r.kernel.org; linux-mtd@...ts.infradead.org;
> >>>>>> nicolas.ferre@...rochip.com; alexandre.belloni@...tlin.com;
> >>>>>> claudiu.beznea@...rochip.com; Simek, Michal
> >>>> <michal.simek@....com>;
> >>>>>> linux-arm-kernel@...ts.infradead.org; amitrkcian2002@...il.com;
> >>>>>> patches@...nsource.cirrus.com; vitalyr@...nsource.cirrus.com
> >>>>>> Subject: RE: [PATCH V7 1/7] spi: Add stacked and parallel
> >>>>>> memories support in SPI core
> >>>>>>
> >>>>>> Hi,
> >>>>>>
> >>>>>>> -----Original Message-----
> >>>>>>> From: Amit Kumar Mahapatra <amit.kumar-mahapatra@....com>
> >>>>>>> Sent: Thursday, April 6, 2023 7:54 AM
> >>>>>>> To: broonie@...nel.org; tudor.ambarus@...aro.org;
> >>>>>>> pratyush@...nel.org; michael@...le.cc;
> >>>>>>> miquel.raynal@...tlin.com; richard@....at; vigneshr@...com
> >>>>>>> Cc: git@....com; sbinding@...nsource.cirrus.com; linux-
> >>>>>>> spi@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> >>>>>>> mtd@...ts.infradead.org; nicolas.ferre@...rochip.com;
> >>>>>>> alexandre.belloni@...tlin.com; claudiu.beznea@...rochip.com;
> >>>>>>> michal.simek@....com; linux-arm-kernel@...ts.infradead.org;
> >>>>>>> amitrkcian2002@...il.com; Amit Kumar Mahapatra <amit.kumar-
> >>>>>>> mahapatra@....com>
> >>>>>>> Subject: [PATCH V7 1/7] spi: Add stacked and parallel memories
> >>>>>> support
> >>>>>>> in SPI core
> >>>>>>>
> >>>>>>> For supporting multiple CS the SPI device need to be aware of
> >>>>>>> all
> >>>>>> the CS
> >>>>>>> values. So, the "chip_select" member in the spi_device structure
> >>>>>>> is
> >>>>>> now
> >>>>>>> an
> >>>>>>> array that holds all the CS values.
> >>>>>>>
> >>>>>>> spi_device structure now has a "cs_index_mask" member. This acts
> >>>>>>> as
> >>>>>> an
> >>>>>>> index to the chip_select array. If nth bit of spi->cs_index_mask
> >>>>>>> is
> >>>>>> set
> >>>>>>> then the driver would assert spi->chip_select[n].
> >>>>>>>
> >>>>>>> In parallel mode all the chip selects are asserted/de-asserted
> >>>>>>> simultaneously and each byte of data is stored in both devices,
> >>>>>>> the
> >>>>>> even
> >>>>>>> bits in one, the odd bits in the other. The split is
> >>>>>>> automatically
> >>>>>> handled
> >>>>>>> by the GQSPI controller. The GQSPI controller supports a maximum
> >>>>>>> of two flashes connected in parallel mode. A
> >>>>>>> SPI_CONTROLLER_MULTI_CS flag bit is added in the spi
> >>>>>>> controntroller flags, through
> >>>>>>> ctlr->flags the spi
> >>>>>> core
> >>>>>>> will make sure that the controller is capable of handling
> >>>>>>> multiple
> >>>>>> chip
> >>>>>>> selects at once.
> >>>>>>>
> >>>>>>> For supporting multiple CS via GPIO the cs_gpiod member of the
> >>>>>>> spi_device structure is now an array that holds the gpio
> >>>>>>> descriptor for each chipselect.
> >>>>>>>
> >>>>>>> Multi CS support using GPIO is not tested due to unavailability
> >>>>>>> of necessary hardware setup.
> >>>>>>>
> >>>>>>> Multi CS configuration with one native CS and one GPIO CS is not
> >>>>>>> supported as this configuration could not be tested due to
> >>>>>>> unavailability of necessary hardware setup.
> >>>>>> I've tested this chain on a released laptop (HP EliteBook 840 G9)
> >>>>>> which uses SPI to interface to 2 amps, one amp uses a native CS
> >>>>>> and the other uses a GPIO CS, and I noticed that when using this
> >>>>>> chain, the second amp no longer works.
> >>>>> Thank you for testing this patch series on GPIO CS setup. As I
> >>>>> don't have a GPIO CS setup, is it possible for you debug the
> >>>>> failure and share more details/logs where the problem is?
> >>>>>
> >>>>> Regards,
> >>>>> Amit
> >>>> We are willing and able to debug this failure and share the failure logs.
> >>>> The first issue that I see is a kernel crash when trying to set the GPIO CS:
> >>>>
> >>>> [ 2.951658] general protection fault, probably for non-canonical
> >>>> address
> >>>> 0xdead000000000122: 0000 [#1] PREEMPT SMP NOPTI [ 2.951771]
> CPU:
> >> 9
> >>>> PID: 379 Comm: systemd-udevd Tainted: G A 6.3.0-rc3+ #30
> >>>> [ 2.951826] Hardware name: HP /896D, BIOS U70 Ver. 89.33.02
> >>>> 10/29/2021 [ 2.951882] RIP:
> >>>> 0010:gpiod_set_value_cansleep+0x21/0xa0
> >>>> [ 2.951941] Code: 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 48
> >>>> 85 ff
> >>>> 74 3e 55 48 89 e5 41 55 41 89 f5 41 54 49 89 fc 48 81 ff 00 f0 ff
> >>>> ff
> >>>> 77 2c <48> 8b 3f 48 85 ff 74 53 48 83 bf 68 03 00 00 00 74 34 44 89
> >>>> ee 4c [ 2.952043]
> >>>> RSP: 0018:ffffc008c0deb928 EFLAGS: 00010287 [ 2.952080] RAX:
> >>>> 0000000000000001 RBX: ffffa0a489534c00 RCX:
> >>>> 0000000000000000
> >>>> [ 2.952124] RDX: dead000000000122 RSI: 0000000000000001 RDI:
> >>>> dead000000000122
> >>>> [ 2.952167] RBP: ffffc008c0deb938 R08: 0000000000000000 R09:
> >>>> ffffc008c0deb868
> >>>> [ 2.952211] R10: ffffffffffffffff R11: 00000000000000b0 R12:
> >>>> dead000000000122
> >>>> [ 2.952256] R13: 0000000000000001 R14: 0000000000000000 R15:
> >>>> 0000000000000000
> >>>> [ 2.952299] FS: 00007f7fa5b5b880(0000)
> >>>> GS:ffffa0a81f840000(0000)
> >>>> knlGS:0000000000000000
> >>>> [ 2.952369] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [
> >>>> 2.952407] CR2: 000055d648427100 CR3: 000000010e960003 CR4:
> >>>> 0000000000770ee0
> >>>> [ 2.952451] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> >>>> 0000000000000000
> >>>> [ 2.952492] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
> >>>> 0000000000000400
> >>>> [ 2.952533] PKRU: 55555554
> >>>> [ 2.952561] Call Trace:
> >>>> [ 2.952579] <TASK>
> >>>> [ 2.952598] spi_set_cs+0x257/0x4a0 [ 2.952630]
> >>>> spi_setup+0x1a2/0x500 [ 2.952667] __spi_add_device+0x88/0x160 [
> >>>> 2.952710] spi_add_device+0x60/0x90 [ 2.952738]
> >>>> smi_spi_probe+0x178/0x370 [serial_multi_instantiate] [ 2.952792]
> >>>> smi_probe+0xcf/0x110 [serial_multi_instantiate] [ 2.952854]
> >>>> platform_probe+0x42/0xb0 [ 2.952885] really_probe+0x1b2/0x420 [
> >>>> 2.952914] __driver_probe_device+0x7e/0x180 [ 2.952947]
> >>>> driver_probe_device+0x23/0xa0 [ 2.952993]
> >>>> __driver_attach+0xe4/0x1e0 [ 2.953021] ?
> >>>> __pfx___driver_attach+0x10/0x10
> >>>> [ 2.953061] bus_for_each_dev+0x7a/0xd0 [ 2.953088]
> >>>> driver_attach+0x1e/0x30 [ 2.953123] bus_add_driver+0x11c/0x220
> >>>> [ 2.953150] driver_register+0x64/0x130 [ 2.953174] ?
> >>>> __pfx_init_module+0x10/0x10 [serial_multi_instantiate] [
> >>>> 2.953221]
> >>>> __platform_driver_register+0x1e/0x30
> >>>> [ 2.953251] smi_driver_init+0x1c/0xff0
> >>>> [serial_multi_instantiate] [ 2.953310] do_one_initcall+0x46/0x220
> [ 2.953339] ?
> >>>> kmalloc_trace+0x2a/0xa0 [ 2.953375] do_init_module+0x52/0x220 [
> >>>> 2.953411] load_module+0x223c/0x2460 [ 2.953450]
> >>>> __do_sys_finit_module+0xc8/0x140 [ 2.953479] ?
> >>>> __do_sys_finit_module+0xc8/0x140
> >>>> [ 2.953510] __x64_sys_finit_module+0x18/0x20 [ 2.953538]
> >>>> do_syscall_64+0x38/0x90 [ 2.953574]
> >>>> entry_SYSCALL_64_after_hwframe+0x72/0xdc
> >>>> [ 2.953606] RIP: 0033:0x7f7fa5d7476d [ 2.953639] Code: 00 c3
> >>>> 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa
> >>>> 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24
> >>>> 08 0f
> >>>> 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f3 36 0d 00 f7 d8 64 89 01
> >>>> 48 [ 2.953739] RSP: 002b:00007fff1f8dd3b8 EFLAGS: 00000246
> >> ORIG_RAX:
> >>>> 0000000000000139
> >>>> [ 2.956833] RAX: ffffffffffffffda RBX: 000055d648654ab0 RCX:
> >>>> 00007f7fa5d7476d
> >>>> [ 2.959202] RDX: 0000000000000000 RSI: 00007f7fa5c54ded RDI:
> >>>> 0000000000000006
> >>>> [ 2.961542] RBP: 0000000000020000 R08: 0000000000000000 R09:
> >>>> 0000000000000000
> >>>> [ 2.964312] R10: 0000000000000006 R11: 0000000000000246 R12:
> >>>> 00007f7fa5c54ded
> >>>> [ 2.966694] R13: 0000000000000000 R14: 000055d6483f41a0 R15:
> >>>> 000055d648654ab0
> >>>> [ 2.967668] resource: resource sanity check: requesting [mem
> >>>> 0x00000000fedc0000-0x00000000fedcffff], which spans more than pnp
> >>>> 00:04 [mem 0xfedc0000-0xfedc7fff] [ 2.968998] </TASK> [
> >>>> 2.971615] caller
> >>>> igen6_probe+0x178/0x8e0 [igen6_edac] mapping multiple BARs [
> >>>> 2.975014] Modules linked in: igen6_edac(+) fjes(-)
> >>>> serial_multi_instantiate(+) int3403_thermal sch_fq_codel
> >>>> int340x_thermal_zone int3400_thermal intel_hid acpi_thermal_rel
> >>>> acpi_tad sparse_keymap acpi_pad mac_hid msr parport_pc ppdev lp
> >>>> parport drm ramoops reed_solomon efi_pstore ip_tables x_tables
> >>>> autofs4 spi_pxa2xx_platform dw_dmac dw_dmac_core nvme
> >> intel_lpss_pci
> >>>> intel_lpss crc32_pclmul thunderbolt i2c_i801 xhci_pci idma64
> >>>> nvme_core i2c_smbus virt_dma xhci_pci_renesas video wmi
> >>>> pinctrl_tigerlake [ 2.987901] ---[ end trace 0000000000000000
> >>>> ]---
> >> [ 3.157030] RIP:
> >>>> 0010:gpiod_set_value_cansleep+0x21/0xa0
> >>>> [ 3.159077] Code: 90 90 90 90 90 90 90 90 90 0f 1f 44 00 00 48
> >>>> 85 ff
> >>>> 74 3e 55 48 89 e5 41 55 41 89 f5 41 54 49 89 fc 48 81 ff 00 f0 ff
> >>>> ff
> >>>> 77 2c <48> 8b 3f 48 85 ff 74 53 48 83 bf 68 03 00 00 00 74 34 44 89
> >>>> ee 4c [ 3.161461]
> >>>> RSP: 0018:ffffc008c0deb928 EFLAGS: 00010287 [ 3.164005] RAX:
> >>>> 0000000000000001 RBX: ffffa0a489534c00 RCX:
> >>>> 0000000000000000
> >>>> [ 3.166354] RDX: dead000000000122 RSI: 0000000000000001 RDI:
> >>>> dead000000000122
> >>>> [ 3.168499] RBP: ffffc008c0deb938 R08: 0000000000000000 R09:
> >>>> ffffc008c0deb868
> >>>> [ 3.170609] R10: ffffffffffffffff R11: 00000000000000b0 R12:
> >>>> dead000000000122
> >>>> [ 3.172893] R13: 0000000000000001 R14: 0000000000000000 R15:
> >>>> 0000000000000000
> >>>> [ 3.175335] FS: 00007f7fa5b5b880(0000)
> >>>> GS:ffffa0a81f840000(0000)
> >>>> knlGS:0000000000000000
> >>>> [ 3.180434] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [
> >>>> 3.183356] CR2: 000055d648427100 CR3: 000000010e960003 CR4:
> >>>> 0000000000770ee0
> >>>> [ 3.185107] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> >>>> 0000000000000000
> >>>> [ 3.186840] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
> >>>> 0000000000000400
> >>>> [ 3.188647] PKRU: 55555554
> >>> Thank you for sharing the logs.
> >>> As per our analysis the spi->cs_gpiod[0] is getting messed up while
> >>> setting it in __spi_add_device( ).
> >>> Is it possible for you to do the following changes on top of this
> >>> patch series & re-run your test.
> >>>
> >>> After applying this patch series, in drivers/spi/spi.c file replace
> >>> the following code snippet in __spi_add_device( ) function defination.
> >>>
> >>> if (ctlr->cs_gpiods) {
> >>> for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
> >>> spi_set_csgpiod(spi, idx,
> >>> ctlr->cs_gpiods[spi_get_chipselect(spi, idx)]); }
> >>>
> >>> with the below code snippet
> >>>
> >>> if (ctlr->cs_gpiods) {
> >>> for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
> >>> if (!(idx != 0 && !spi_get_chipselect(spi, idx)))
> >>> spi_set_csgpiod(spi, idx, ctlr-
> >>> cs_gpiods[spi_get_chipselect(spi, idx)]);
> >>> }
> >>> }
> >>>
> >>> then re-run your test.
> >>>
> >>> Regards,
> >>> Amit
> >> I'm still seeing a crash on probe:
> >>
> >> [ 3.265683] BUG: unable to handle page fault for address:
> >> 00000000fffedfdd
> >> [ 3.265744] #PF: supervisor read access in kernel mode [ 3.265781] #PF:
> >> error_code(0x0000) - not-present page [ 3.265817] PGD 0 P4D 0 [
> >> 3.265840] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 3.265865] CPU: 4 PID:
> >> 385 Comm: systemd-udevd Tainted: G A 6.3.0-rc3+ #32 [
> >> 3.265910] Hardware name: HP /896D, BIOS U70 Ver. 89.33.02 10/29/2021
> >> [ 3.265956]
> >> RIP: 0010:gpiod_set_raw_value_commit+0x3d/0xf0
> >> [ 3.266007] Code: 48 89 e5 41 55 44 0f b6 ee 41 54 53 48 8b 17 48
> >> 2b
> >> 82 70 03 00 00 4c 8b a2 68 03 00 00 48 c1 f8 03 48 0f af c1 66 90 48
> >> 89
> >> c6 <49> 8b 44 24 60 44 89 ea 4c 89 e7 ff d0 0f 1f 00 5b 41 5c 41 5d
> >> 5d [ 3.266092] RSP: 0018:ffffaad780f6f620 EFLAGS: 00010a03 [
> >> 3.266121]
> >> RAX: 333330b6bdbad102 RBX: ffff9c8d4a5f6800 RCX:
> >> cccccccccccccccd
> >> [ 3.266156] RDX: ffff9c8d4a5f6d40 RSI: 333330b6bdbad102 RDI:
> >> ffff9c8d4a5f6d40
> >> [ 3.266192] RBP: ffffaad780f6f638 R08: 00000001018c3789 R09:
> >> 0000000000000000
> >> [ 3.266228] R10: ffff9c8c4009ee40 R11: 0000000000000000 R12:
> >> 00000000fffedf7d
> >> [ 3.266264] R13: 0000000000000000 R14: 0000000000000001 R15:
> >> 0000000000000001
> >> [ 3.266299] FS: 00007f98d04de880(0000) GS:ffff9c90df700000(0000)
> >> knlGS:0000000000000000
> >> [ 3.266358] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [
> >> 3.266388] CR2: 00000000fffedfdd CR3: 000000010b680003 CR4:
> >> 0000000000770ee0
> >> [ 3.266422] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> >> 0000000000000000
> >> [ 3.266457] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
> >> 0000000000000400
> >> [ 3.266490] PKRU: 55555554
> >> [ 3.266513] Call Trace:
> >> [ 3.266530] <TASK>
> >> [ 3.266546] gpiod_set_value_nocheck+0x5b/0x70 [ 3.266583]
> >> gpiod_set_value_cansleep+0x3e/0xa0
> >> [ 3.266609] spi_set_cs+0x257/0x4a0 [ 3.266634]
> >> spi_transfer_one_message+0x49/0x740
> >> [ 3.266672] __spi_pump_transfer_message+0x29b/0x620
> >> [ 3.266712] __spi_sync+0x26f/0x3b0 [ 3.266735]
> >> spi_write_then_read+0x157/0x210 [ 3.266771] ?
> >> psi_group_change+0x175/0x3b0
> [ 3.266802] regmap_spi_read+0xe/0x20
> >> [ 3.266826] _regmap_raw_read+0xe1/0x210 [ 3.266861]
> >> _regmap_bus_read+0x3a/0x70 [ 3.266887] _regmap_read+0x66/0x140
> [
> >> 3.266918] regmap_read+0x3f/0x70 [ 3.266957]
> >> cs35l41_hda_probe+0x553/0xc10 [snd_hda_scodec_cs35l41]
> [ 3.267027]
> >> cs35l41_hda_spi_probe+0x62/0x80 [snd_hda_scodec_cs35l41_spi] [
> >> 3.267096] spi_probe+0x55/0x90 [ 3.267145]
> >> really_probe+0x1b2/0x420 [ 3.267184]
> >> __driver_probe_device+0x7e/0x180 [ 3.267227]
> >> driver_probe_device+0x23/0xa0 [ 3.267287]
> >> __driver_attach+0xe4/0x1e0 [ 3.267326] ?
> >> __pfx___driver_attach+0x10/0x10
> >> [ 3.267381] bus_for_each_dev+0x7a/0xd0 [ 3.267406]
> >> driver_attach+0x1e/0x30 [ 3.267437] bus_add_driver+0x11c/0x220 [
> >> 3.267461] driver_register+0x64/0x130 [ 3.267483] ?
> >> __pfx_init_module+0x10/0x10 [snd_hda_scodec_cs35l41_spi] [
> >> 3.267525] __spi_register_driver+0xa1/0xd0 [ 3.270712] ?
> >> __pfx_init_module+0x10/0x10 [snd_hda_scodec_cs35l41_spi] [
> >> 3.273446] cs35l41_spi_driver_init+0x1c/0xff0
> >> [snd_hda_scodec_cs35l41_spi]
> >> [ 3.275119] do_one_initcall+0x46/0x220 [ 3.276828] ?
> >> kmalloc_trace+0x2a/0xa0 [ 3.279290] do_init_module+0x52/0x220 [
> >> 3.283593] load_module+0x223c/0x2460 [ 3.283602]
> >> __do_sys_finit_module+0xc8/0x140 [ 3.287883] ?
> >> __do_sys_finit_module+0xc8/0x140
> >> [ 3.287907] __x64_sys_finit_module+0x18/0x20 [ 3.293156]
> >> do_syscall_64+0x38/0x90 [ 3.298937]
> >> entry_SYSCALL_64_after_hwframe+0x72/0xdc
> >> [ 3.298945] RIP: 0033:0x7f98d06f776d [ 3.319574] Code: 00 c3 66
> >> 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa
> >> 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08
> >> 0f
> >> 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d f3 36 0d 00 f7 d8 64 89 01
> >> 48 [ 3.319579] RSP: 002b:00007ffd988f7a08 EFLAGS: 00000246
> ORIG_RAX:
> >> 0000000000000139
> >> [ 3.319585] RAX: ffffffffffffffda RBX: 000055af06a7d030 RCX:
> >> 00007f98d06f776d
> >> [ 3.319589] RDX: 0000000000000000 RSI: 00007f98d05d7ded RDI:
> >> 0000000000000013
> >> [ 3.329520] RBP: 0000000000020000 R08: 0000000000000000 R09:
> >> 0000000000000000
> >> [ 3.329523] R10: 0000000000000013 R11: 0000000000000246 R12:
> >> 00007f98d05d7ded
> >> [ 3.329525] R13: 0000000000000000 R14: 000055af06cdd040 R15:
> >> 000055af06a7d030
> >> [ 3.329531] </TASK>
> >> [ 3.329533] Modules linked in: snd_hda_intel(+) ttm
> >> snd_intel_dspcfg btusb rapl snd_seq_midi snd_intel_sdw_acpi libarc4
> >> intel_cstate binfmt_misc
> >> uvcvideo(+) snd_seq_midi_event btrtl
> >> snd_hda_scodec_cs35l41_spi(+) snd_hda_codec drm_display_helper
> >> cdc_ncm(+) videobuf2_vmalloc snd_rawmidi btbcm uvc cdc_ether cec
> >> btintel videobuf2_memops snd_hda_scodec_cs35l41_i2c snd_hda_core
> >> videobuf2_v4l2 uas usbnet rc_core snd_hwdep btmtk
> >> snd_hda_scodec_cs35l41 input_leds mii wmi_bmof videodev snd_seq
> >> processor_thermal_device_pci bluetooth iwlwifi drm_kms_helper
> snd_pcm
> >> snd_hda_cs_dsp_ctls processor_thermal_device mei_me
> videobuf2_common
> >> snd_seq_device i2c_algo_bit cs_dsp processor_thermal_rfim
> >> ecdh_generic usb_storage serio_raw mc syscopyarea ecc
> >> processor_thermal_mbox ucsi_acpi snd_soc_cs35l41_lib 8250_dw mei
> >> snd_timer cfg80211 sysfillrect typec_ucsi processor_thermal_rapl
> >> igen6_edac sysimgblt intel_rapl_common typec snd soundcore
> >> int3403_thermal int340x_thermal_zone serial_multi_instantiate
> >> int3400_thermal intel_hid acpi_thermal_rel [ 3.338475]
> >> sparse_keymap acpi_tad acpi_pad mac_hid sch_fq_codel msr parport_pc
> >> ppdev lp parport drm ramoops reed_solomon efi_pstore ip_tables
> >> x_tables autofs4 spi_pxa2xx_platform dw_dmac dw_dmac_core
> >> intel_lpss_pci nvme intel_lpss i2c_i801 idma64 crc32_pclmul
> >> thunderbolt i2c_smbus nvme_core xhci_pci virt_dma xhci_pci_renesas
> >> video wmi pinctrl_tigerlake [ 3.338514]
> >> CR2: 00000000fffedfdd [ 3.338517] ---[ end trace 0000000000000000
> >> ]--- [ 3.504965] RIP: 0010:gpiod_set_raw_value_commit+0x3d/0xf0
> >> [ 3.504973] Code: 48 89 e5 41 55 44 0f b6 ee 41 54 53 48 8b 17 48
> >> 2b
> >> 82 70 03 00 00 4c 8b a2 68 03 00 00 48 c1 f8 03 48 0f af c1 66 90 48
> >> 89
> >> c6 <49> 8b 44 24 60 44 89 ea 4c 89 e7 ff d0 0f 1f 00 5b 41 5c 41 5d
> >> 5d [ 3.504975] RSP: 0018:ffffaad780f6f620 EFLAGS: 00010a03 [
> >> 3.504978]
> >> RAX: 333330b6bdbad102 RBX: ffff9c8d4a5f6800 RCX:
> >> cccccccccccccccd
> >> [ 3.504979] RDX: ffff9c8d4a5f6d40 RSI: 333330b6bdbad102 RDI:
> >> ffff9c8d4a5f6d40
> >> [ 3.504980] RBP: ffffaad780f6f638 R08: 00000001018c3789 R09:
> >> 0000000000000000
> >> [ 3.504982] R10: ffff9c8c4009ee40 R11: 0000000000000000 R12:
> >> 00000000fffedf7d
> >> [ 3.504983] R13: 0000000000000000 R14: 0000000000000001 R15:
> >> 0000000000000001
> >> [ 3.504984] FS: 00007f98d04de880(0000) GS:ffff9c90df700000(0000)
> >> knlGS:0000000000000000
> >> [ 3.504986] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [
> >> 3.504988] CR2: 00000000fffedfdd CR3: 000000010b680003 CR4:
> >> 0000000000770ee0
> >> [ 3.504989] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> >> 0000000000000000
> >> [ 3.504990] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7:
> >> 0000000000000400
> >> [ 3.504992] PKRU: 55555554
> >>
> >> Thanks,
> >> Stefan
> > Thanks for the logs.
> >
> > Could you please confirm that your test case was passing with
> >
> https://github.com/torvalds/linux/commit/303feb3cc06ac0665d0ee9c14149
> 4
> > 1200e60e8a3 patch but it is failing with the current patch series ?
>
> I retested with the latest master kernel
> https://github.com/torvalds/linux/commit/33afd4b76393627477e878b3b195
> d606e585d816
> and I could see it worked fine. I attached a dmesg log of this.
>
> That particular commit id you posted does not work, due to a different issue
> which was fixed in a later commit.
Thank you for the confirmation.
>
> >
> > Regarding the failure
> > The logs suggest that we are trying to access an invalid pointer while
> > calling the gpiod_set_value_cansleep( ) API.
> > This could be possible if the cs_num is corrupted and we are trying to
> > access an invalid spi->cs_gpiod[ ].
> > To confirm the same could you please do the following changes in the
> > code and re-test.
> >
> > After applying this patch series, in drivers/spi/spi.c file replace
> > the following code snippet in __spi_add_device( ) function definition.
> > if (ctlr->cs_gpiods) {
> > for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
> > spi_set_csgpiod(spi, idx,
> > ctlr->cs_gpiods[spi_get_chipselect(spi, idx)]); }
> >
> > with the below code snippet
> >
> > if (ctlr->cs_gpiods) {
> > for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
> > if (!(idx != 0 && !spi_get_chipselect(spi, idx))) {
> > printk("%s( ) [%d] cs[%d] = [%d]\n", __func__, __LINE__, idx,
> spi_get_chipselect(spi, idx));
> > spi_set_csgpiod(spi, idx, ctlr-
> >cs_gpiods[spi_get_chipselect(spi, idx)]);
> > }
> > }
> > }
> >
> > And at the start of spi_set_cs( ) function in drivers/spi/spi.c file
> > add the following print statements.
> >
> > printk("%s( ) [%d] spi->cs_index_mask == [%d]\n", __func__, __LINE__,
> > spi->cs_index_mask); printk("%s( ) [%d] cs_num == [%d]\n", __func__,
> > __LINE__, cs_num);
>
> I've attached dmesg log of this. It no longer crashes when using the prints (I
> am unsure why), but it still does not work.
> For sanity, I retested these changes with the print lines commented out, and
> the crash returned.
Thanks a lot for the dmesg log.
Here the __ffs() is creating the issue. __ffs() behavior is undefined if
no set bits exist in spi->cs_index_mask , as a result random value
(i.e, 64) is assigned to cs_num.
I think this could be fixed by replacing __ffs() with ffs() calls.
To confirm the same could you please apply the attached patch on top of
this patch series and re-test. If it works fine, then for sanity kindly
rerun by removing the printk lines.
Thanks,
Amit
>
> >
> > Thanks,
> > Amit
> >>>> Thanks,
> >>>>
> >>>> Stefan
> >>>>
> >>>>>> Thanks,
> >>>>>> Stefan Binding
> >>>>>>
> >>>>>>> Signed-off-by: Amit Kumar Mahapatra <amit.kumar-
> >>>>>> mahapatra@....com>
> >>>>>>> ---
> >>>>>>> drivers/spi/spi.c | 226
> >>>>>> ++++++++++++++++++++++++++++------------
> >>>>>>> include/linux/spi/spi.h | 32 ++++--
> >>>>>>> 2 files changed, 183 insertions(+), 75 deletions(-)
> >>>>>>>
> >>>>>>> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index
> >>>>>>> 9036d7a50674..04d7322170c4 100644
> >>>>>>> --- a/drivers/spi/spi.c
> >>>>>>> +++ b/drivers/spi/spi.c
> >>>>>>> @@ -612,10 +612,24 @@ static int spi_dev_check(struct device
> *dev,
> >>>>>>> void *data) {
> >>>>>>> struct spi_device *spi = to_spi_device(dev);
> >>>>>>> struct spi_device *new_spi = data;
> >>>>>>> + int idx, nw_idx;
> >>>>>>>
> >>>>>>> - if (spi->controller == new_spi->controller &&
> >>>>>>> - spi_get_chipselect(spi, 0) == spi_get_chipselect(new_spi,
> >>>>>> 0))
> >>>>>>> - return -EBUSY;
> >>>>>>> + if (spi->controller == new_spi->controller) {
> >>>>>>> + for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
> >>>>>>> + for (nw_idx = 0; nw_idx < SPI_CS_CNT_MAX;
> >>>>>>> nw_idx++) {
> >>>>>>> + if ((idx != 0 &&
> >>>>>> !spi_get_chipselect(spi,
> >>>>>>> idx)) ||
> >>>>>>> + (nw_idx != 0 &&
> >>>>>>> !spi_get_chipselect(spi, nw_idx))) {
> >>>>>>> + continue;
> >>>>>>> + } else if (spi_get_chipselect(spi,
> >>>>>> idx) ==
> >>>>>>> + spi_get_chipselect(new_spi,
> >>>>>> nw_idx))
> >>>>>>> {
> >>>>>>> + dev_err(dev,
> >>>>>>> + "chipselect %d
> >> already
> >>>>>>> in use\n",
> >>>>>>> +
> >>>>>>> spi_get_chipselect(new_spi, nw_idx));
> >>>>>>> + return -EBUSY;
> >>>>>>> + }
> >>>>>>> + }
> >>>>>>> + }
> >>>>>>> + }
> >>>>>>> return 0;
> >>>>>>> }
> >>>>>>>
> >>>>>>> @@ -629,7 +643,7 @@ static int __spi_add_device(struct spi_device
> >>>>>>> *spi)
> >>>>>>> {
> >>>>>>> struct spi_controller *ctlr = spi->controller;
> >>>>>>> struct device *dev = ctlr->dev.parent;
> >>>>>>> - int status;
> >>>>>>> + int status, idx;
> >>>>>>>
> >>>>>>> /*
> >>>>>>> * We need to make sure there's no other device with this
> >> @@
> >>>>>>> -638,8
> >>>>>>> +652,6 @@ static int __spi_add_device(struct spi_device
> >>>>>>> *spi)
> >>>>>>> */
> >>>>>>> status = bus_for_each_dev(&spi_bus_type, NULL, spi,
> >>>>>> spi_dev_check);
> >>>>>>> if (status) {
> >>>>>>> - dev_err(dev, "chipselect %d already in use\n",
> >>>>>>> - spi_get_chipselect(spi, 0));
> >>>>>>> return status;
> >>>>>>> }
> >>>>>>>
> >>>>>>> @@ -649,8 +661,10 @@ static int __spi_add_device(struct
> spi_device
> >>>>>>> *spi)
> >>>>>>> return -ENODEV;
> >>>>>>> }
> >>>>>>>
> >>>>>>> - if (ctlr->cs_gpiods)
> >>>>>>> - spi_set_csgpiod(spi, 0, ctlr-
> >>>>>>>> cs_gpiods[spi_get_chipselect(spi, 0)]);
> >>>>>>> + if (ctlr->cs_gpiods) {
> >>>>>>> + for (idx = 0; idx < SPI_CS_CNT_MAX; idx++)
> >>>>>>> + spi_set_csgpiod(spi, idx, ctlr-
> >>>>>>>> cs_gpiods[spi_get_chipselect(spi, idx)]);
> >>>>>>> + }
> >>>>>>>
> >>>>>>> /*
> >>>>>>> * Drivers may modify this initial i/o setup, but will @@
> >>>>>>> -690,13
> >>>>>>> +704,15 @@ int spi_add_device(struct spi_device *spi) {
> >>>>>>> struct spi_controller *ctlr = spi->controller;
> >>>>>>> struct device *dev = ctlr->dev.parent;
> >>>>>>> - int status;
> >>>>>>> + int status, idx;
> >>>>>>>
> >>>>>>> - /* Chipselects are numbered 0..max; validate. */
> >>>>>>> - if (spi_get_chipselect(spi, 0) >= ctlr->num_chipselect) {
> >>>>>>> - dev_err(dev, "cs%d >= max %d\n",
> >>>>>>> spi_get_chipselect(spi, 0),
> >>>>>>> - ctlr->num_chipselect);
> >>>>>>> - return -EINVAL;
> >>>>>>> + for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
> >>>>>>> + /* Chipselects are numbered 0..max; validate. */
> >>>>>>> + if (spi_get_chipselect(spi, idx) >=
> >>>>>> ctlr->num_chipselect) {
> >>>>>>> + dev_err(dev, "cs%d >= max %d\n",
> >>>>>>> spi_get_chipselect(spi, idx),
> >>>>>>> + ctlr->num_chipselect);
> >>>>>>> + return -EINVAL;
> >>>>>>> + }
> >>>>>>> }
> >>>>>>>
> >>>>>>> /* Set the bus ID string */
> >>>>>>> @@ -713,12 +729,15 @@ static int spi_add_device_locked(struct
> >>>>>>> spi_device *spi) {
> >>>>>>> struct spi_controller *ctlr = spi->controller;
> >>>>>>> struct device *dev = ctlr->dev.parent;
> >>>>>>> + int idx;
> >>>>>>>
> >>>>>>> - /* Chipselects are numbered 0..max; validate. */
> >>>>>>> - if (spi_get_chipselect(spi, 0) >= ctlr->num_chipselect) {
> >>>>>>> - dev_err(dev, "cs%d >= max %d\n",
> >>>>>>> spi_get_chipselect(spi, 0),
> >>>>>>> - ctlr->num_chipselect);
> >>>>>>> - return -EINVAL;
> >>>>>>> + for (idx = 0; idx < SPI_CS_CNT_MAX; idx++) {
> >>>>>>> + /* Chipselects are numbered 0..max; validate. */
> >>>>>>> + if (spi_get_chipselect(spi, idx) >=
> >>>>>> ctlr->num_chipselect) {
> >>>>>>> + dev_err(dev, "cs%d >= max %d\n",
> >>>>>>> spi_get_chipselect(spi, idx),
> >>>>>>> + ctlr->num_chipselect);
> >>>>>>> + return -EINVAL;
> >>>>>>> + }
> >>>>>>> }
> >>>>>>>
> >>>>>>> /* Set the bus ID string */
> >>>>>>> @@ -966,58 +985,118 @@ static void spi_res_release(struct
> >>>>>>> spi_controller *ctlr, struct spi_message *mes static void
> >>>>>>> spi_set_cs(struct spi_device *spi, bool enable, bool
> >>>>>> force)
> >>>>>>> {
> >>>>>>> bool activate = enable;
> >>>>>>> + u32 cs_num = __ffs(spi->cs_index_mask);
> >>>>>>> + int idx;
> >>>>>>>
> >>>>>>> /*
> >>>>>>> - * Avoid calling into the driver (or doing delays) if the chip
> >>>>>> select
> >>>>>>> - * isn't actually changing from the last time this was called.
> >>>>>>> + * In parallel mode all the chip selects are
> >>>>>> asserted/de-asserted
> >>>>>>> + * at once
> >>>>>>> */
> >>>>>>> - if (!force && ((enable && spi->controller->last_cs ==
> >>>>>>> spi_get_chipselect(spi, 0)) ||
> >>>>>>> - (!enable && spi->controller->last_cs !=
> >>>>>>> spi_get_chipselect(spi, 0))) &&
> >>>>>>> - (spi->controller->last_cs_mode_high == (spi->mode &
> >>>>>>> SPI_CS_HIGH)))
> >>>>>>> - return;
> >>>>>>> -
> >>>>>>> - trace_spi_set_cs(spi, activate);
> >>>>>>> -
> >>>>>>> - spi->controller->last_cs = enable ? spi_get_chipselect(spi, 0)
> >>>>>> : -1;
> >>>>>>> - spi->controller->last_cs_mode_high = spi->mode &
> >>>>>>> SPI_CS_HIGH;
> >>>>>>> -
> >>>>>>> - if ((spi_get_csgpiod(spi, 0) ||
> >>>>>> !spi->controller->set_cs_timing)
> >>>>>>> && !activate)
> >>>>>>> - spi_delay_exec(&spi->cs_hold, NULL);
> >>>>>>> -
> >>>>>>> - if (spi->mode & SPI_CS_HIGH)
> >>>>>>> - enable = !enable;
> >>>>>>> + if ((spi->cs_index_mask & SPI_PARALLEL_CS_MASK) ==
> >>>>>>> SPI_PARALLEL_CS_MASK) {
> >>>>>>> + spi->controller->last_cs_mode_high = spi->mode &
> >>>>>>> SPI_CS_HIGH;
> >>>>>>> +
> >>>>>>> + if ((spi_get_csgpiod(spi, 0) || !spi->controller-
> >>>>>>>> set_cs_timing) && !activate)
> >>>>>>> + spi_delay_exec(&spi->cs_hold, NULL);
> >>>>>>> +
> >>>>>>> + if (spi->mode & SPI_CS_HIGH)
> >>>>>>> + enable = !enable;
> >>>>>>> +
> >>>>>>> + if (spi_get_csgpiod(spi, 0) && spi_get_csgpiod(spi,
> >>>>>> 1)) {
> >>>>>>> + if (!(spi->mode & SPI_NO_CS)) {
> >>>>>>> + /*
> >>>>>>> + * Historically ACPI has no means of
> >>>>>> the
> >>>>>>> GPIO polarity and
> >>>>>>> + * thus the SPISerialBus() resource
> >>>>>>> defines it on the per-chip
> >>>>>>> + * basis. In order to avoid a chain of
> >>>>>>> negations, the GPIO
> >>>>>>> + * polarity is considered being Active
> >>>>>>> High. Even for the cases
> >>>>>>> + * when _DSD() is involved (in the
> >>>>>>> updated versions of ACPI)
> >>>>>>> + * the GPIO CS polarity must be
> >>>>>> defined
> >>>>>>> Active High to avoid
> >>>>>>> + * ambiguity. That's why we use
> >>>>>> enable,
> >>>>>>> that takes SPI_CS_HIGH
> >>>>>>> + * into account.
> >>>>>>> + */
> >>>>>>> + if (has_acpi_companion(&spi->dev)) {
> >>>>>>> + for (idx = 0; idx <
> >>>>>>> SPI_CS_CNT_MAX; idx++)
> >>>>>>> +
> >>>>>>> gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx),
> >>>>>>> +
> >>>>>>> !enable);
> >>>>>>> + } else {
> >>>>>>> + for (idx = 0; idx <
> >>>>>>> SPI_CS_CNT_MAX; idx++)
> >>>>>>> + /* Polarity handled by
> >>>>>>> GPIO library */
> >>>>>>> +
> >>>>>>> gpiod_set_value_cansleep(spi_get_csgpiod(spi, idx),
> >>>>>>> +
> >>>>>>> activate);
> >>>>>>> + }
> >>>>>>> + }
> >>>>>>> + /* Some SPI masters need both GPIO CS &
> >>>>>>> slave_select */
> >>>>>>> + if ((spi->controller->flags &
> >>>>>>> SPI_MASTER_GPIO_SS) &&
> >>>>>>> + spi->controller->set_cs)
> >>>>>>> + spi->controller->set_cs(spi, !enable);
> >>>>>>> + } else if (spi->controller->set_cs) {
> >>>>>>> + spi->controller->set_cs(spi, !enable);
> >>>>>>> + }
> >>>>>>>
> >>>>>>> - if (spi_get_csgpiod(spi, 0)) {
> >>>>>>> - if (!(spi->mode & SPI_NO_CS)) {
> >>>>>>> - /*
> >>>>>>> - * Historically ACPI has no means of the GPIO
> >>>>>>> polarity and
> >>>>>>> - * thus the SPISerialBus() resource defines it
> >>>>>> on
> >>>>>>> the per-chip
> >>>>>>> - * basis. In order to avoid a chain of
> >>>>>> negations,
> >>>>>>> the GPIO
> >>>>>>> - * polarity is considered being Active High.
> >>>>>> Even
> >>>>>>> for the cases
> >>>>>>> - * when _DSD() is involved (in the updated
> >>>>>>> versions of ACPI)
> >>>>>>> - * the GPIO CS polarity must be defined
> Active
> >>>>>>> High to avoid
> >>>>>>> - * ambiguity. That's why we use enable, that
> >>>>>>> takes SPI_CS_HIGH
> >>>>>>> - * into account.
> >>>>>>> - */
> >>>>>>> - if (has_acpi_companion(&spi->dev))
> >>>>>>> -
> >>>>>>> gpiod_set_value_cansleep(spi_get_csgpiod(spi, 0), !enable);
> >>>>>>> + if (spi_get_csgpiod(spi, 0) || spi_get_csgpiod(spi, 1)
> >>>>>> ||
> >>>>>>> + !spi->controller->set_cs_timing) {
> >>>>>>> + if (activate)
> >>>>>>> + spi_delay_exec(&spi->cs_setup,
> >> NULL);
> >>>>>>> else
> >>>>>>> - /* Polarity handled by GPIO library */
> >>>>>>> -
> >>>>>>> gpiod_set_value_cansleep(spi_get_csgpiod(spi, 0), activate);
> >>>>>>> + spi_delay_exec(&spi->cs_inactive,
> >>>>>>> NULL);
> >>>>>>> }
> >>>>>>> - /* Some SPI masters need both GPIO CS &
> slave_select
> >>>>>>> */
> >>>>>>> - if ((spi->controller->flags & SPI_MASTER_GPIO_SS)
> &&
> >>>>>>> - spi->controller->set_cs)
> >>>>>>> + } else {
> >>>>>>> + /*
> >>>>>>> + * Avoid calling into the driver (or doing delays) if
> >>>>>> the
> >>>>>>> chip select
> >>>>>>> + * isn't actually changing from the last time this was
> >>>>>>> called.
> >>>>>>> + */
> >>>>>>> + if (!force && ((enable && spi->controller->last_cs ==
> >>>>>>> + spi_get_chipselect(spi, cs_num)) ||
> >>>>>>> + (!enable && spi->controller->last_cs
> >>>>>> !=
> >>>>>>> + spi_get_chipselect(spi, cs_num))) &&
> >>>>>>> + (spi->controller->last_cs_mode_high ==
> >>>>>>> + (spi->mode & SPI_CS_HIGH)))
> >>>>>>> + return;
> >>>>>>> +
> >>>>>>> + trace_spi_set_cs(spi, activate);
> >>>>>>> +
> >>>>>>> + spi->controller->last_cs = enable ?
> >>>>>>> spi_get_chipselect(spi, cs_num) : -1;
> >>>>>>> + spi->controller->last_cs_mode_high = spi->mode &
> >>>>>>> SPI_CS_HIGH;
> >>>>>>> +
> >>>>>>> + if ((spi_get_csgpiod(spi, cs_num) || !spi->controller-
> >>>>>>>> set_cs_timing) && !activate)
> >>>>>>> + spi_delay_exec(&spi->cs_hold, NULL);
> >>>>>>> +
> >>>>>>> + if (spi->mode & SPI_CS_HIGH)
> >>>>>>> + enable = !enable;
> >>>>>>> +
> >>>>>>> + if (spi_get_csgpiod(spi, cs_num)) {
> >>>>>>> + if (!(spi->mode & SPI_NO_CS)) {
> >>>>>>> + /*
> >>>>>>> + * Historically ACPI has no means of
> >>>>>> the
> >>>>>>> GPIO polarity and
> >>>>>>> + * thus the SPISerialBus() resource
> >>>>>>> defines it on the per-chip
> >>>>>>> + * basis. In order to avoid a chain of
> >>>>>>> negations, the GPIO
> >>>>>>> + * polarity is considered being Active
> >>>>>>> High. Even for the cases
> >>>>>>> + * when _DSD() is involved (in the
> >>>>>>> updated versions of ACPI)
> >>>>>>> + * the GPIO CS polarity must be
> >>>>>> defined
> >>>>>>> Active High to avoid
> >>>>>>> + * ambiguity. That's why we use
> >>>>>> enable,
> >>>>>>> that takes SPI_CS_HIGH
> >>>>>>> + * into account.
> >>>>>>> + */
> >>>>>>> + if (has_acpi_companion(&spi->dev))
> >>>>>>> +
> >>>>>>> gpiod_set_value_cansleep(spi_get_csgpiod(spi, cs_num),
> >>>>>>> +
> >>>>>>> !enable);
> >>>>>>> + else
> >>>>>>> + /* Polarity handled by GPIO
> >>>>>>> library */
> >>>>>>> +
> >>>>>>> gpiod_set_value_cansleep(spi_get_csgpiod(spi, cs_num),
> >>>>>>> +
> >>>>>>> activate);
> >>>>>>> + }
> >>>>>>> + /* Some SPI masters need both GPIO CS &
> >>>>>>> slave_select */
> >>>>>>> + if ((spi->controller->flags &
> >>>>>>> SPI_MASTER_GPIO_SS) &&
> >>>>>>> + spi->controller->set_cs)
> >>>>>>> + spi->controller->set_cs(spi, !enable);
> >>>>>>> + } else if (spi->controller->set_cs) {
> >>>>>>> spi->controller->set_cs(spi, !enable);
> >>>>>>> - } else if (spi->controller->set_cs) {
> >>>>>>> - spi->controller->set_cs(spi, !enable);
> >>>>>>> - }
> >>>>>>> + }
> >>>>>>>
> >>>>>>> - if (spi_get_csgpiod(spi, 0) ||
> >>>>>> !spi->controller->set_cs_timing) {
> >>>>>>> - if (activate)
> >>>>>>> - spi_delay_exec(&spi->cs_setup, NULL);
> >>>>>>> - else
> >>>>>>> - spi_delay_exec(&spi->cs_inactive, NULL);
> >>>>>>> + if (spi_get_csgpiod(spi, cs_num) || !spi->controller-
> >>>>>>>> set_cs_timing) {
> >>>>>>> + if (activate)
> >>>>>>> + spi_delay_exec(&spi->cs_setup,
> >> NULL);
> >>>>>>> + else
> >>>>>>> + spi_delay_exec(&spi->cs_inactive,
> >>>>>>> NULL);
> >>>>>>> + }
> >>>>>>> }
> >>>>>>> }
> >>>>>>>
> >>>>>>> @@ -2246,8 +2325,8 @@ static void
> of_spi_parse_dt_cs_delay(struct
> >>>>>>> device_node *nc, static int of_spi_parse_dt(struct spi_controller
> >>>>>>> *ctlr, struct
> >>>>>> spi_device
> >>>>>>> *spi,
> >>>>>>> struct device_node *nc)
> >>>>>>> {
> >>>>>>> - u32 value;
> >>>>>>> - int rc;
> >>>>>>> + u32 value, cs[SPI_CS_CNT_MAX] = {0};
> >>>>>>> + int rc, idx;
> >>>>>>>
> >>>>>>> /* Mode (clock phase/polarity/etc.) */
> >>>>>>> if (of_property_read_bool(nc, "spi-cpha")) @@ -2320,13
> >>>>>>> +2399,21
> >>>>>> @@
> >>>>>>> static int of_spi_parse_dt(struct spi_controller *ctlr, struct
> >>>>>>> spi_device *spi,
> >>>>>>> }
> >>>>>>>
> >>>>>>> /* Device address */
> >>>>>>> - rc = of_property_read_u32(nc, "reg", &value);
> >>>>>>> - if (rc) {
> >>>>>>> + rc = of_property_read_variable_u32_array(nc, "reg", &cs[0],
> >> 1,
> >>>>>>> + SPI_CS_CNT_MAX);
> >>>>>>> + if (rc < 0 || rc > ctlr->num_chipselect) {
> >>>>>>> dev_err(&ctlr->dev, "%pOF has no valid 'reg' property
> >>>>>> (%d)\n",
> >>>>>>> nc, rc);
> >>>>>>> return rc;
> >>>>>>> + } else if ((of_property_read_bool(nc, "parallel-memories"))
> >> &&
> >>>>>>> + (!(ctlr->flags & SPI_CONTROLLER_MULTI_CS))) {
> >>>>>>> + dev_err(&ctlr->dev, "SPI controller doesn't support
> >>>>>> multi
> >>>>>>> CS\n");
> >>>>>>> + return -EINVAL;
> >>>>>>> }
> >>>>>>> - spi_set_chipselect(spi, 0, value);
> >>>>>>> + for (idx = 0; idx < rc; idx++)
> >>>>>>> + spi_set_chipselect(spi, idx, cs[idx]);
> >>>>>>> + /* By default set the spi->cs_index_mask as 1 */
> >>>>>>> + spi->cs_index_mask = 0x01;
> >>>>>>>
> >>>>>>> /* Device speed */
> >>>>>>> if (!of_property_read_u32(nc, "spi-max-frequency", &value))
> >> @@
> >>>>>>> -3907,7 +3994,8 @@ static int __spi_validate(struct spi_device
> >>>>>>> *spi, struct spi_message *message)
> >>>>>>> * cs_change is set for each transfer.
> >>>>>>> */
> >>>>>>> if ((spi->mode & SPI_CS_WORD) && (!(ctlr->mode_bits &
> >>>>>>> SPI_CS_WORD) ||
> >>>>>>> - spi_get_csgpiod(spi, 0))) {
> >>>>>>> + spi_get_csgpiod(spi, 0) ||
> >>>>>>> + spi_get_csgpiod(spi, 1))) {
> >>>>>>> size_t maxsize;
> >>>>>>> int ret;
> >>>>>>>
> >>>>>>> diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
> >>>>>>> index 873ced6ae4ca..6453b246e0af 100644
> >>>>>>> --- a/include/linux/spi/spi.h
> >>>>>>> +++ b/include/linux/spi/spi.h
> >>>>>>> @@ -19,6 +19,11 @@
> >>>>>>> #include <linux/acpi.h>
> >>>>>>> #include <linux/u64_stats_sync.h>
> >>>>>>>
> >>>>>>> +/* Max no. of CS supported per spi device */ #define
> >>>>>>> +SPI_CS_CNT_MAX
> >>>>>>> +2
> >>>>>>> +
> >>>>>>> +/* chip select mask */
> >>>>>>> +#define SPI_PARALLEL_CS_MASK (BIT(0) | BIT(1))
> >>>>>>> struct dma_chan;
> >>>>>>> struct software_node;
> >>>>>>> struct ptp_system_timestamp;
> >>>>>>> @@ -166,6 +171,7 @@ extern void
> >>>>>>> spi_transfer_cs_change_delay_exec(struct spi_message *msg,
> >>>>>>> * deasserted. If @cs_change_delay is used from
> >> @spi_transfer,
> >>>>>>> then the
> >>>>>>> * two delays will be added up.
> >>>>>>> * @pcpu_statistics: statistics for the spi_device
> >>>>>>> + * @cs_index_mask: Bit mask of the active chipselect(s) in the
> >>>>>>> chipselect array
> >>>>>>> *
> >>>>>>> * A @spi_device is used to interchange data between an SPI slave
> >>>>>>> * (usually a discrete chip) and CPU memory.
> >>>>>>> @@ -181,7 +187,7 @@ struct spi_device {
> >>>>>>> struct spi_controller *controller;
> >>>>>>> struct spi_controller *master; /* Compatibility layer
> >>>>>> */
> >>>>>>> u32 max_speed_hz;
> >>>>>>> - u8 chip_select;
> >>>>>>> + u8 chip_select[SPI_CS_CNT_MAX];
> >>>>>>> u8 bits_per_word;
> >>>>>>> bool rt;
> >>>>>>> #define SPI_NO_TX BIT(31) /* No transmit wire */
> >>>>>>> @@ -202,7 +208,7 @@ struct spi_device {
> >>>>>>> void *controller_data;
> >>>>>>> char modalias[SPI_NAME_SIZE];
> >>>>>>> const char *driver_override;
> >>>>>>> - struct gpio_desc *cs_gpiod; /* Chip select gpio
> >>>>>> desc
> >>>>>>> */
> >>>>>>> + struct gpio_desc *cs_gpiod[SPI_CS_CNT_MAX]; /*
> >>>>>> Chip
> >>>>>>> select gpio desc */
> >>>>>>> struct spi_delay word_delay; /* Inter-word delay */
> >>>>>>> /* CS delays */
> >>>>>>> struct spi_delay cs_setup;
> >>>>>>> @@ -212,6 +218,13 @@ struct spi_device {
> >>>>>>> /* The statistics */
> >>>>>>> struct spi_statistics __percpu *pcpu_statistics;
> >>>>>>>
> >>>>>>> + /* Bit mask of the chipselect(s) that the driver need to use
> >>>>>> from
> >>>>>>> + * the chipselect array.When the controller is capable to
> >>>>>> handle
> >>>>>>> + * multiple chip selects & memories are connected in parallel
> >>>>>>> + * then more than one bit need to be set in cs_index_mask.
> >>>>>>> + */
> >>>>>>> + u32 cs_index_mask : SPI_CS_CNT_MAX;
> >>>>>>> +
> >>>>>>> /*
> >>>>>>> * likely need more hooks for more protocol options affecting
> >> how
> >>>>>>> * the controller talks to each chip, like:
> >>>>>>> @@ -268,22 +281,22 @@ static inline void *spi_get_drvdata(const
> >>>>>>> struct spi_device *spi)
> >>>>>>>
> >>>>>>> static inline u8 spi_get_chipselect(const struct spi_device
> >>>>>>> *spi,
> >>>>>> u8 idx)
> >>>>>>> {
> >>>>>>> - return spi->chip_select;
> >>>>>>> + return spi->chip_select[idx];
> >>>>>>> }
> >>>>>>>
> >>>>>>> static inline void spi_set_chipselect(struct spi_device *spi,
> >>>>>>> u8
> >>>>>> idx, u8
> >>>>>>> chipselect)
> >>>>>>> {
> >>>>>>> - spi->chip_select = chipselect;
> >>>>>>> + spi->chip_select[idx] = chipselect;
> >>>>>>> }
> >>>>>>>
> >>>>>>> static inline struct gpio_desc *spi_get_csgpiod(const struct
> >>>>>> spi_device
> >>>>>>> *spi, u8 idx)
> >>>>>>> {
> >>>>>>> - return spi->cs_gpiod;
> >>>>>>> + return spi->cs_gpiod[idx];
> >>>>>>> }
> >>>>>>>
> >>>>>>> static inline void spi_set_csgpiod(struct spi_device *spi, u8
> >>>>>>> idx,
> >>>>>> struct
> >>>>>>> gpio_desc *csgpiod)
> >>>>>>> {
> >>>>>>> - spi->cs_gpiod = csgpiod;
> >>>>>>> + spi->cs_gpiod[idx] = csgpiod;
> >>>>>>> }
> >>>>>>>
> >>>>>>> /**
> >>>>>>> @@ -388,6 +401,8 @@ extern struct spi_device
> >>>>>>> *spi_new_ancillary_device(struct spi_device *spi, u8 ch
> >>>>>>> * @bus_lock_spinlock: spinlock for SPI bus locking
> >>>>>>> * @bus_lock_mutex: mutex for exclusion of multiple callers
> >>>>>>> * @bus_lock_flag: indicates that the SPI bus is locked for
> >>>>>> exclusive use
> >>>>>>> + * @multi_cs_cap: indicates that the SPI Controller can
> >>>>>> assert/de-assert
> >>>>>>> + * more than one chip select at once.
> >>>>>>> * @setup: updates the device mode and clocking records used by
> a
> >>>>>>> * device's SPI controller; protocol code may call this. This
> >>>>>>> * must fail if an unrecognized or unsupported mode is
> >> requested.
> >>>>>>> @@ -554,6 +569,11 @@ struct spi_controller {
> >>>>>>> #define SPI_CONTROLLER_MUST_TX BIT(4) /*
> Requires tx
> >>>>>>> */
> >>>>>>>
> >>>>>>> #define SPI_MASTER_GPIO_SS BIT(5) /* GPIO CS
> must
> >>>>>> select
> >>>>>>> slave */
> >>>>>>> + /*
> >>>>>>> + * The spi-controller has multi chip select capability and can
> >>>>>>> + * assert/de-assert more than one chip select at once.
> >>>>>>> + */
> >>>>>>> +#define SPI_CONTROLLER_MULTI_CS BIT(6)
> >>>>>>>
> >>>>>>> /* Flag indicating if the allocation of this struct is devres-
> >>>>>>> managed */
> >>>>>>> bool devm_allocated;
> >>>>>>> --
> >>>>>>> 2.17.1
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