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c312ef1763
linux/drivers/ata
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Dan Williams c312ef1763 libata/ahci: Drop PCS quirk for Denverton and beyond 
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>
2019-08-30 20:53:42 -06:00
..
acard-ahci.c acard_ahci: use dma_set_mask_and_coherent 2019-08-26 13:58:58 -06:00
ahci_brcm.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 118 2019-05-24 17:39:02 +02:00
ahci_ceva.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
ahci_da850.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 45 2019-05-24 17:27:12 +02:00
ahci_dm816.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 45 2019-05-24 17:27:12 +02:00
ahci_imx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
ahci_mtk.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
ahci_mvebu.c ata: ahci: mvebu: request PHY suspend/resume for Armada 3700 2019-01-11 14:47:51 -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 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 45 2019-05-24 17:27:12 +02:00
ahci_qoriq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 45 2019-05-24 17:27:12 +02:00
ahci_seattle.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 235 2019-06-19 17:09:07 +02:00
ahci_st.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
ahci_sunxi.c drivers: ata: ahci_sunxi: Increased SATA/AHCI DMA TX/RX FIFOs 2019-07-05 10:17:18 -06:00
ahci_tegra.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
ahci_xgene.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
ahci.c libata/ahci: Drop PCS quirk for Denverton and beyond 2019-08-30 20:53:42 -06:00
ahci.h libata/ahci: Drop PCS quirk for Denverton and beyond 2019-08-30 20:53:42 -06:00
ata_generic.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
ata_piix.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
Kconfig ata: add Buddha PATA controller driver 2019-02-08 06:32:01 -07:00
libahci_platform.c ata: libahci: do not complain in case of deferred probe 2019-07-31 08:51:17 -06:00
libahci.c ahci: Do not export local variable ahci_em_messages 2019-08-30 14:25:57 -06:00
libata-acpi.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
libata-core.c libata: Drop firmware version check from the ST1000LM024 quirk 2019-07-02 15:53:09 -06:00
libata-eh.c libata: don't request sense data on !ZAC ATA devices 2019-06-25 09:22:45 -06:00
libata-pmp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
libata-scsi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
libata-sff.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
libata-trace.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
libata-transport.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 209 2019-05-30 11:29:53 -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() 2019-07-29 16:00:14 -06:00
libata.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
Makefile ata: add Buddha PATA controller driver 2019-02-08 06:32:01 -07:00
pata_acpi.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_ali.c ata: Deprecate pci_get_bus_and_slot() 2018-01-11 17:23:23 -06:00
pata_amd.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
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 treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_atiixp.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_atp867x.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
pata_bk3710.c pata_bk3710: clarify license version and use SPDX header 2018-03-01 13:59:03 -08:00
pata_buddha.c ata/pata_buddha: Probe via modalias instead of initcall 2019-08-23 06:58:50 -06:00
pata_cmd64x.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_cmd640.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_cs5520.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
pata_cs5530.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
pata_cs5535.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
pata_cs5536.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
pata_cypress.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_efar.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_ep93xx.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_falcon.c pata_falcon: clarify license version and use SPDX header 2018-03-01 13:58:17 -08:00
pata_ftide010.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_gayle.c ata: add Amiga Gayle PATA controller driver 2018-03-19 07:41:36 -07:00
pata_hpt3x2n.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_hpt3x3.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
pata_hpt37x.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_hpt366.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_icside.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
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 treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
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 treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_ixp4xx_cf.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pata_jmicron.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_legacy.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
pata_macio.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_marvell.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
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 treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_netcell.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_ninja32.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
pata_ns87410.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
pata_ns87415.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
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 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pata_oldpiix.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_opti.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_optidma.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_palmld.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pata_pcmcia.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
pata_pdc202xx_old.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_pdc2027x.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
pata_piccolo.c ata: use CONFIG_PM_SLEEP instead of CONFIG_PM where applicable in host drivers 2014-05-09 22:37:49 -04:00
pata_platform.c ata: pata_platform: Add IRQF_SHARED to IRQ flags 2019-02-08 06:42:55 -07:00
pata_pxa.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
pata_radisys.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_rb532_cf.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pata_rdc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
pata_rz1000.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_samsung_cf.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
pata_sc1200.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
pata_sch.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 300 2019-06-05 17:37:00 +02:00
pata_serverworks.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_sil680.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
pata_sis.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_sl82c105.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pata_triflex.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
pata_via.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
pdc_adma.c pdc_adma: use dma_set_mask_and_coherent 2019-08-26 13:58:58 -06:00
sata_dwc_460ex.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
sata_fsl.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
sata_gemini.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
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 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
sata_inic162x.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sata_mv.c sata_mv: use dma_set_mask_and_coherent 2019-08-26 13:58:58 -06:00
sata_nv.c sata_nv: use dma_set_mask_and_coherent 2019-08-26 13:58:58 -06:00
sata_promise.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sata_promise.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
sata_qstor.c sata_qstor: use dma_set_mask_and_coherent 2019-08-26 13:58:58 -06:00
sata_rcar.c sata_rcar: Remove ata_host_alloc() error printing 2019-05-09 11:19:32 -06:00
sata_sil24.c sata_sil24: use dma_set_mask_and_coherent 2019-08-26 13:58:58 -06:00
sata_sil.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sata_sis.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
sata_svw.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sata_sx4.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sata_uli.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00
sata_via.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sata_vsc.c libata: switch remaining drivers to use dma_set_mask_and_coherent 2019-08-26 13:58:59 -06:00
sis.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00