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[SCSI] pm8001: set SSC down-spreading only to get less errors on some 6G device. 

Signed-off-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
jack wang 2009-12-07 17:46:22 +08:00 committed by James Bottomley
parent afc5ca9ddc
commit 0330dba361
1 changed files with 21 additions and 44 deletions
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65
drivers/scsi/pm8001/pm8001_hwi.c
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@ -373,10 +373,7 @@ static int bar4_shift(struct pm8001_hba_info *pm8001_ha, u32 shiftValue)
static void __devinit
mpi_set_phys_g3_with_ssc(struct pm8001_hba_info *pm8001_ha, u32 SSCbit)
{
u32 offset;
u32 value;
u32 i, j;
u32 bit_cnt;
u32 value, offset, i;
#define SAS2_SETTINGS_LOCAL_PHY_0_3_SHIFT_ADDR 0x00030000
#define SAS2_SETTINGS_LOCAL_PHY_4_7_SHIFT_ADDR 0x00040000
@ -392,55 +389,35 @@ mpi_set_phys_g3_with_ssc(struct pm8001_hba_info *pm8001_ha, u32 SSCbit)
*/
if (-1 == bar4_shift(pm8001_ha, SAS2_SETTINGS_LOCAL_PHY_0_3_SHIFT_ADDR))
return;
/* set SSC bit of PHY 0 - 3 */
for (i = 0; i < 4; i++) {
offset = SAS2_SETTINGS_LOCAL_PHY_0_3_OFFSET + 0x4000 * i;
value = pm8001_cr32(pm8001_ha, 2, offset);
if (SSCbit) {
value |= 0x00000001 << PHY_G3_WITH_SSC_BIT_SHIFT;
value &= ~(0x00000001 << PHY_G3_WITHOUT_SSC_BIT_SHIFT);
} else {
value |= 0x00000001 << PHY_G3_WITHOUT_SSC_BIT_SHIFT;
value &= ~(0x00000001 << PHY_G3_WITH_SSC_BIT_SHIFT);
}
bit_cnt = 0;
for (j = 0; j < 31; j++)
if ((value >> j) & 0x00000001)
bit_cnt++;
if (bit_cnt % 2)
value &= ~(0x00000001 << SNW3_PHY_CAPABILITIES_PARITY);
else
value |= 0x00000001 << SNW3_PHY_CAPABILITIES_PARITY;
pm8001_cw32(pm8001_ha, 2, offset, value);
pm8001_cw32(pm8001_ha, 2, offset, 0x80001501);
}
/* shift membase 3 for SAS2_SETTINGS_LOCAL_PHY 4 - 7 */
if (-1 == bar4_shift(pm8001_ha, SAS2_SETTINGS_LOCAL_PHY_4_7_SHIFT_ADDR))
return;
/* set SSC bit of PHY 4 - 7 */
for (i = 4; i < 8; i++) {
offset = SAS2_SETTINGS_LOCAL_PHY_4_7_OFFSET + 0x4000 * (i-4);
value = pm8001_cr32(pm8001_ha, 2, offset);
if (SSCbit) {
value |= 0x00000001 << PHY_G3_WITH_SSC_BIT_SHIFT;
value &= ~(0x00000001 << PHY_G3_WITHOUT_SSC_BIT_SHIFT);
} else {
value |= 0x00000001 << PHY_G3_WITHOUT_SSC_BIT_SHIFT;
value &= ~(0x00000001 << PHY_G3_WITH_SSC_BIT_SHIFT);
}
bit_cnt = 0;
for (j = 0; j < 31; j++)
if ((value >> j) & 0x00000001)
bit_cnt++;
if (bit_cnt % 2)
value &= ~(0x00000001 << SNW3_PHY_CAPABILITIES_PARITY);
else
value |= 0x00000001 << SNW3_PHY_CAPABILITIES_PARITY;
pm8001_cw32(pm8001_ha, 2, offset, value);
pm8001_cw32(pm8001_ha, 2, offset, 0x80001501);
}
/*************************************************************
Change the SSC upspreading value to 0x0 so that upspreading is disabled.
Device MABC SMOD0 Controls
Address: (via MEMBASE-III):
Using shifted destination address 0x0_0000: with Offset 0xD8
31:28 R/W Reserved Do not change
27:24 R/W SAS_SMOD_SPRDUP 0000
23:20 R/W SAS_SMOD_SPRDDN 0000
19:0 R/W Reserved Do not change
Upon power-up this register will read as 0x8990c016,
and I would like you to change the SAS_SMOD_SPRDUP bits to 0b0000
so that the written value will be 0x8090c016.
This will ensure only down-spreading SSC is enabled on the SPC.
*************************************************************/
value = pm8001_cr32(pm8001_ha, 2, 0xd8);
pm8001_cw32(pm8001_ha, 2, 0xd8, 0x8000C016);
/*set the shifted destination address to 0x0 to avoid error operation */
bar4_shift(pm8001_ha, 0x0);