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linux/drivers/ata
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Dan Williams 223b0481ed libata/ahci: Drop PCS quirk for Denverton and beyond 
[ Upstream commit c312ef1763 ]

The Linux ahci driver has historically implemented a configuration fixup
for platforms / platform-firmware that fails to enable the ports prior
to OS hand-off at boot. The fixup was originally implemented way back
before ahci moved from drivers/scsi/ to drivers/ata/, and was updated in
2007 via commit 49f2909039 "ahci: update PCS programming". The quirk
sets a port-enable bitmap in the PCS register at offset 0x92.

This quirk could be applied generically up until the arrival of the
Denverton (DNV) platform. The DNV AHCI controller architecture supports
more than 6 ports and along with that the PCS register location and
format were updated to allow for more possible ports in the bitmap. DNV
AHCI expands the register to 32-bits and moves it to offset 0x94.

As it stands there are no known problem reports with existing Linux
trying to set bits at offset 0x92 which indicates that the quirk is not
applicable. Likely it is not applicable on a wider range of platforms,
but it is difficult to discern which platforms if any still depend on
the quirk.

Rather than try to fix the PCS quirk to consider the DNV register layout
instead require explicit opt-in. The assumption is that the OS driver
need not touch this register, and platforms can be added with a new
boad_ahci_pcs7 board-id when / if problematic platforms are found in the
future. The logic in ahci_intel_pcs_quirk() looks for all Intel AHCI
instances with "legacy" board-ids and otherwise skips the quirk if the
board was matched by class-code.

Reported-by: Stephen Douthit <stephend@silicom-usa.com>
Cc: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Stephen Douthit <stephend@silicom-usa.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-10-05 13:09:52 +02:00
..
acard-ahci.c libata: convert core and drivers to ->hw_tag usage 2018-05-11 13:10:43 -07:00
ahci_brcm.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_ceva.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_da850.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_dm816.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_imx.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_mtk.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_mvebu.c Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-08-24 13:20:33 -07:00
ahci_octeon.c Delete redundant return value check of platform_get_resource() 2017-03-06 15:40:59 -05:00
ahci_platform.c Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-08-24 13:20:33 -07:00
ahci_qoriq.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_seattle.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_st.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_sunxi.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_tegra.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci_xgene.c ata: add an extra argument to ahci_platform_get_resources() 2018-08-22 08:08:27 -07:00
ahci.c libata/ahci: Drop PCS quirk for Denverton and beyond 2019-10-05 13:09:52 +02:00
ahci.h libata/ahci: Drop PCS quirk for Denverton and beyond 2019-10-05 13:09:52 +02:00
ata_generic.c
ata_piix.c ata_piix: constify pci_bits 2018-01-08 06:15:41 -08:00
Kconfig ata: Remove depends on HAS_DMA in case of platform dependency 2018-07-02 13:18:22 -07:00
libahci_platform.c ata: libahci: do not complain in case of deferred probe 2019-08-25 10:47:55 +02:00
libahci.c Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-08-24 13:20:33 -07:00
libata-acpi.c
libata-core.c libata: Extend quirks for the ST1000LM024 drives with NOLPM quirk 2019-06-19 08:17:59 +02:00
libata-eh.c libata: don't request sense data on !ZAC ATA devices 2019-07-26 09:14:12 +02:00
libata-pmp.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
libata-scsi.c libata: have ata_scsi_rw_xlat() fail invalid passthrough requests 2019-08-29 08:28:45 +02:00
libata-sff.c libata: add SG safety checks in SFF pio transfers 2019-08-29 08:28:45 +02:00
libata-trace.c libata: NCQ encapsulation for ZAC MANAGEMENT OUT 2016-05-09 12:36:46 -04:00
libata-transport.c libata: add refcounting to ata_host 2018-03-13 13:29:10 -07:00
libata-transport.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
libata-zpodd.c libata: zpodd: Fix small read overflow in zpodd_get_mech_type() 2019-08-25 10:47:54 +02:00
libata.h scsi: libsas: dynamically allocate and free ata host 2018-06-19 22:02:25 -04:00
Makefile Merge branch 'for-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-04-03 17:42:25 -07:00
pata_acpi.c
pata_ali.c ata: Deprecate pci_get_bus_and_slot() 2018-01-11 17:23:23 -06:00
pata_amd.c cs5536: add support for IDE controller variant 2017-08-11 10:35:07 -07:00
pata_arasan_cf.c pata_arasan_cf: Delete an unnecessary variable initialisation in arasan_cf_probe() 2018-02-18 05:16:35 -08:00
pata_artop.c ata: pata_artop: remove redundant initialization of pio 2017-09-18 20:24:21 -07:00
pata_atiixp.c libata:pata_atiixp: Don't use unconnected secondary port on SB600 2018-01-08 04:02:02 -08:00
pata_atp867x.c ata: mark expected switch fall-throughs 2017-10-23 07:06:09 -07:00
pata_bk3710.c pata_bk3710: clarify license version and use SPDX header 2018-03-01 13:59:03 -08:00
pata_cmd64x.c
pata_cmd640.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pata_cs5520.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_cs5530.c
pata_cs5535.c
pata_cs5536.c cs5536: add support for IDE controller variant 2017-08-11 10:35:07 -07:00
pata_cypress.c
pata_efar.c
pata_ep93xx.c ata: ep93xx: cut drvdata assignment 2017-05-30 11:54:36 -04:00
pata_falcon.c pata_falcon: clarify license version and use SPDX header 2018-03-01 13:58:17 -08:00
pata_ftide010.c ata: ftide010: Add a quirk for SQ201 2018-08-27 14:25:54 -06:00
pata_gayle.c ata: add Amiga Gayle PATA controller driver 2018-03-19 07:41:36 -07:00
pata_hpt3x2n.c
pata_hpt3x3.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_hpt37x.c ata: hpt37x: Convert to use match_string() helper 2018-05-07 08:50:30 -07:00
pata_hpt366.c ata: hpt366: fix incorrect mask when checking at cmd_high_time 2016-07-12 11:02:05 -04:00
pata_icside.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pata_imx.c Merge branch 'for-4.19' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-08-24 13:20:33 -07:00
pata_isapnp.c
pata_it821x.c pata_it821x: Delete an error message for a failed memory allocation in it821x_firmware_command() 2018-02-18 05:26:07 -08:00
pata_it8213.c
pata_ixp4xx_cf.c ata: pass queued command to ->sff_data_xfer method 2017-01-10 11:11:17 -05:00
pata_jmicron.c PCI: Disable async suspend/resume for JMicron multi-function SATA/AHCI 2015-08-24 15:27:11 -05:00
pata_legacy.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pata_macio.c pata_macio: Delete an error message for a failed memory allocation in two functions 2018-02-18 05:24:16 -08:00
pata_marvell.c ata: Use IS_ENABLED() instead of checking for built-in or module 2016-05-27 11:27:23 -04:00
pata_mpc52xx.c pata_mpc52xx: Delete an error message for a failed memory allocation in mpc52xx_ata_probe() 2018-02-18 05:23:25 -08:00
pata_mpiix.c
pata_netcell.c
pata_ninja32.c pata_ninja32: Avoid corrupting status flags 2016-08-30 11:59:47 -04:00
pata_ns87410.c
pata_ns87415.c
pata_octeon_cf.c pata_octeon_cf: use of_property_read_{bool|u32}() 2017-08-28 10:44:24 -07:00
pata_of_platform.c ata: constify of_device_id structures 2017-03-06 15:18:01 -05:00
pata_oldpiix.c
pata_opti.c
pata_optidma.c
pata_palmld.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pata_pcmcia.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pata_pdc202xx_old.c
pata_pdc2027x.c ata: pata_pdc2027x: Replace mdelay with msleep 2018-01-25 07:28:31 -08:00
pata_piccolo.c
pata_platform.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pata_pxa.c ata: pata_pxa: remove the dmaengine compat need 2018-06-18 21:32:07 +02:00
pata_radisys.c
pata_rb532_cf.c ata: rb532_cf: cut drvdata assignment 2017-05-30 11:54:37 -04:00
pata_rdc.c ata: declare ata_port_info structures as const 2017-06-12 14:06:34 -04:00
pata_rz1000.c
pata_samsung_cf.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
pata_sc1200.c
pata_sch.c ata: declare ata_port_info structures as const 2017-06-12 14:06:34 -04:00
pata_serverworks.c
pata_sil680.c ata: remove deprecated use of pci api 2015-04-08 10:55:05 -04:00
pata_sis.c
pata_sl82c105.c
pata_triflex.c
pata_via.c libata: remove ata_sff_data_xfer_noirq() 2018-07-11 10:45:28 -07:00
pdc_adma.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_dwc_460ex.c libata: convert core and drivers to ->hw_tag usage 2018-05-11 13:10:43 -07:00
sata_fsl.c sata_fsl: remove dead code in tag retrieval 2018-06-19 09:30:27 -07:00
sata_gemini.c ata: sata_gemini: Introduce explicit IDE pin control 2017-08-11 10:32:09 -07:00
sata_gemini.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sata_highbank.c libahci: Allow drivers to override stop_engine 2018-04-26 11:25:04 -07:00
sata_inic162x.c ata: declare ata_port_info structures as const 2017-06-12 14:06:34 -04:00
sata_mv.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
sata_nv.c sata_nv: remove redundant pointers sdev0 and sdev1 2018-07-02 07:47:06 -07:00
sata_promise.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_promise.h ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_qstor.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_rcar.c sata_rcar: fix deferred probing 2019-02-12 19:47:08 +01:00
sata_sil.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_sil24.c Merge branch 'for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-06-05 17:01:41 -07:00
sata_sis.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_svw.c ata: Convert to using %pOF instead of full_name 2017-07-18 18:02:36 -04:00
sata_sx4.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_uli.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sata_via.c sata_via: Enable optional hotplug on VT6420 2017-06-26 16:54:53 -04:00
sata_vsc.c ata: update references for libata documentation 2017-05-16 11:25:59 -04:00
sis.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00