Date: Tue, 11 Jul 2017 21:52:11 +0000 (UTC) From: Marius Strobl <marius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r320899 - stable/10/sys/dev/sdhci Message-ID: <201707112152.v6BLqBu7006445@repo.freebsd.org>
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Author: marius Date: Tue Jul 11 21:52:11 2017 New Revision: 320899 URL: https://svnweb.freebsd.org/changeset/base/320899 Log: MFC: r320577, r320620 Retry up to 2 ms to enable bus power as at least with some Intel SDHCI/eMMC controllers the first attempt after a D3 to D0 transition, i. e. when the firmware has put the devices into D3 state before, can fail. Modified: stable/10/sys/dev/sdhci/sdhci.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/dev/sdhci/sdhci.c ============================================================================== --- stable/10/sys/dev/sdhci/sdhci.c Tue Jul 11 21:51:43 2017 (r320898) +++ stable/10/sys/dev/sdhci/sdhci.c Tue Jul 11 21:52:11 2017 (r320899) @@ -367,6 +367,7 @@ sdhci_set_clock(struct sdhci_slot *slot, uint32_t cloc static void sdhci_set_power(struct sdhci_slot *slot, u_char power) { + int i; uint8_t pwr; if (slot->power == power) @@ -395,9 +396,20 @@ sdhci_set_power(struct sdhci_slot *slot, u_char power) break; } WR1(slot, SDHCI_POWER_CONTROL, pwr); - /* Turn on the power. */ + /* + * Turn on VDD1 power. Note that at least some Intel controllers can + * fail to enable bus power on the first try after transiting from D3 + * to D0, so we give them up to 20 ms. + */ pwr |= SDHCI_POWER_ON; - WR1(slot, SDHCI_POWER_CONTROL, pwr); + for (i = 0; i < 20; i++) { + WR1(slot, SDHCI_POWER_CONTROL, pwr); + if (RD1(slot, SDHCI_POWER_CONTROL) & SDHCI_POWER_ON) + break; + DELAY(100); + } + if (!(RD1(slot, SDHCI_POWER_CONTROL) & SDHCI_POWER_ON)) + slot_printf(slot, "Bus power failed to enable"); if (slot->quirks & SDHCI_QUIRK_INTEL_POWER_UP_RESET) { WR1(slot, SDHCI_POWER_CONTROL, pwr | 0x10);
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