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sata_mv: workaround errata SATA#26
Workaround for errata SATA#26. Prevents accidently putting a drive to sleep when attempting COMRESET, by ORing 0xf000 with the values written to SCR_CONTROL. Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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1 changed files with 19 additions and 1 deletions
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@ -1296,7 +1296,25 @@ static int mv_scr_write(struct ata_link *link, unsigned int sc_reg_in, u32 val)
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unsigned int ofs = mv_scr_offset(sc_reg_in);
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if (ofs != 0xffffffffU) {
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writelfl(val, mv_ap_base(link->ap) + ofs);
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void __iomem *addr = mv_ap_base(link->ap) + ofs;
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if (sc_reg_in == SCR_CONTROL) {
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/*
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* Workaround for 88SX60x1 FEr SATA#26:
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*
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* COMRESETs have to take care not to accidently
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* put the drive to sleep when writing SCR_CONTROL.
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* Setting bits 12..15 prevents this problem.
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*
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* So if we see an outbound COMMRESET, set those bits.
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* Ditto for the followup write that clears the reset.
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*
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* The proprietary driver does this for
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* all chip versions, and so do we.
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*/
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if ((val & 0xf) == 1 || (readl(addr) & 0xf) == 1)
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val |= 0xf000;
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}
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writelfl(val, addr);
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return 0;
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} else
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return -EINVAL;
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