xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[SCSI] isci: oem parameter format v1.3 (cable select)

Browse Source 
v1.3 allows the attenuation of the attached cables to be specified to
the driver in terms of 'short', 'medium', and 'long' (see probe_roms.h).
These settings (per phy) are retrieved from the platform oem-parameters
(BIOS rom) or via a module parameter override.

Reviewed-by: Jiangbi Liu <jiangbi.liu@intel.com>
Signed-off-by: Jeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Jeff Skirvin
2012-01-04 01:32:49 -08:00
committed by James Bottomley
parent 594e566ae5
commit 9fee607f0b
5 changed files with 111 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/scsi/isci/probe_roms.h
View File

@@ -193,7 +193,8 @@ struct isci_oem_hdr {
#define ISCI_ROM_VER_1_0 0x10
#define ISCI_ROM_VER_1_1 0x11
#define ISCI_ROM_VER_LATEST ISCI_ROM_VER_1_1
#define ISCI_ROM_VER_1_3 0x13
#define ISCI_ROM_VER_LATEST ISCI_ROM_VER_1_3
/* Allowed PORT configuration modes APC Automatic PORT configuration mode is
* defined by the OEM configuration parameters providing no PHY_MASK parameters
@@ -270,7 +271,40 @@ struct sci_oem_params {
};
uint8_t do_enable_ssc;
};
uint8_t reserved;
/*
* This field indicates length of the SAS/SATA cable between
* host and device.
* This field is used make relationship between analog
* parameters of the phy in the silicon and length of the cable.
* Supported cable attenuation levels:
* "short"- up to 3m, "medium"-3m to 6m, and "long"- more than
* 6m.
*
* This is bit mask field:
*
* BIT: (MSB) 7 6 5 4
* ASSIGNMENT: <phy3><phy2><phy1><phy0> - Medium cable
* length assignment
* BIT: 3 2 1 0 (LSB)
* ASSIGNMENT: <phy3><phy2><phy1><phy0> - Long cable length
* assignment
*
* BITS 7-4 are set when the cable length is assigned to medium
* BITS 3-0 are set when the cable length is assigned to long
*
* The BIT positions are clear when the cable length is
* assigned to short.
*
* Setting the bits for both long and medium cable length is
* undefined.
*
* A value of 0x84 would assign
* phy3 - medium
* phy2 - long
* phy1 - short
* phy0 - short
*/
uint8_t cable_selection_mask;
} controller;
struct {