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Don't try to turn power down MMC bus if it is already down

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Regulator framework doens't like turning off already turned off
regulators, so we get panic on AllWinner boards.

Approved by:	imp (mentor)
Differential Revision:	https://reviews.freebsd.org/D15890
This commit is contained in:
Ilya Bakulin 2018-06-19 11:28:50 +00:00
parent 4c4200c6d9
commit 8b0e085f65
1 changed files with 8 additions and 6 deletions
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14
sys/cam/mmc/mmc_xpt.c
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@ -574,14 +574,16 @@ mmcprobe_start(struct cam_periph *periph, union ccb *start_ccb)
/* FALLTHROUGH */
case PROBE_IDENTIFY:
xpt_path_inq(&start_ccb->cpi, periph->path);
CAM_DEBUG(start_ccb->ccb_h.path, CAM_DEBUG_PROBE, ("Start with PROBE_RESET\n"));
init_standard_ccb(start_ccb, XPT_SET_TRAN_SETTINGS);
cts->ios.power_mode = power_off;
cts->ios_valid = MMC_PM;
init_standard_ccb(start_ccb, XPT_GET_TRAN_SETTINGS);
xpt_action(start_ccb);
mtx_sleep(periph, p_mtx, 0, "mmcios", 100);
if (cts->ios.power_mode != power_off) {
init_standard_ccb(start_ccb, XPT_SET_TRAN_SETTINGS);
cts->ios.power_mode = power_off;
cts->ios_valid = MMC_PM;
xpt_action(start_ccb);
mtx_sleep(periph, p_mtx, 0, "mmcios", 100);
}
/* mmc_power_up */
/* Get the host OCR */
init_standard_ccb(start_ccb, XPT_GET_TRAN_SETTINGS);