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ata: SSDs: Only check for _legal_ "rotational rate" values

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I'm 98% sure that the "byteswapped" value I saw was due to another bug
(bad PIO timings on ipods leading to data corruption) and none of the
growing pile of identify device data files that I have include the
backwards one.

Change-Id: Iea47b7419b120a3c8a282b2e3a8f65b8965356ce
This commit is contained in:
Solomon Peachy 2024-10-15 16:57:53 -04:00
parent 1ece63d054
commit 8daf1f1bfe
1 changed files with 6 additions and 8 deletions
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14
firmware/export/ata.h
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@ -176,7 +176,6 @@ static inline int ata_disk_isssd(void)
0x0401 -> 0xffe == RPM
All others reserved
Some CF cards return 0x0100 (ie byteswapped 0x0001) so accept either.
However, this is a relatively recent change, and we can't rely on it,
especially for the FC1307A CF->SD adapters!
@ -199,14 +198,13 @@ static inline int ata_disk_isssd(void)
then device is standard flash CF. However this is not foolproof
as newer CF cards (and those CF->SD adapters) may report this.
*/
return ( (identify_info[217] == 0x0001 || identify_info[217] == 0x0100) /* "Solid state" rotational rate */
|| ((identify_info[168] & 0x0f) >= 0x06) /* Explicit SSD form factors */
|| (identify_info[169] & (1<<0)) /* TRIM supported */
|| (identify_info[163] > 0) /* CF Advanced timing modes */
|| ((identify_info[83] & (1<<2)) && /* CFA compliant */
((identify_info[160] & (1<<15)) == 0)) /* CF power level 0 */
return ( (identify_info[217] == 0x0001) /* "Solid state" rotational rate */
|| ((identify_info[168] & 0x0f) >= 0x06) /* Explicit SSD form factors */
|| (identify_info[169] & (1<<0)) /* TRIM supported */
|| (identify_info[163] > 0) /* CF Advanced timing modes */
|| ((identify_info[83] & (1<<2)) && /* CFA compliant */
((identify_info[160] & (1<<15)) == 0)) /* CF power level 0 */
);
}