ARM: OMAP2+: critical DRA7xx fix for v4.5-rc
Force the DRA7xx Ethernet internal clock source to stay enabled per TI erratum i877: http://www.ti.com/lit/er/sprz429h/sprz429h.pdf Otherwise, if the Ethernet internal clock source is disabled, the chip will age prematurely, and the RGMII I/O timing will soon fail to meet the delay time and skew specifications for 1000Mbps Ethernet. This fix should go in as soon as possible. Basic build, boot, and PM test results are available here: http://www.pwsan.com/omap/testlogs/omap-critical-fixes-for-v4.5-rc/20160307014209/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJW3UuoAAoJEMePsQ0LvSpL4JIP/j9A1ax1c6kGfNujSzBMrVL3 I68l27ohfbo/MKMc/KsqkdahzGimIUmqkJGxrnA19UMhfyMb6l3pzlVswxfUUd10 EXl/aKlPDa+Xl+A+TCwK78C69ZXHk4nqsNDSixuoIVfxM2uTZZZmNK3FOR+/EaQ8 kUq3zwkg31HgsYxIyvqcCwpsxmDwKXx6fQ3sX5A6tQGvtsdeNofWJOVoGpZe0Ott tmt09VEvSGvXVEL1Um6U5A+8Mw6GPWa9/wih8nYaE70BswuOmIMUxeCkrShDadpn 4Z8rqZg1Q8sdnI7ZCARS2WZ63+wrcjq04Yycf7m8feUc7cIDqlahWnrIWKuvpPAz P20LgrwRQDgifM2TzJupPRUKX+7BoACOXTIt2A3HuOIsZRfqysFx4qoOEdQNBlVq mOOwA/o8ly8hJI7uym8elrPY4MjZ4f6l2h/mFom0XrlS/1NcxXwuGqi9SJNneFSm ALyCIW7YnemoOex0tUcHUg2fiGaRceWlSmzHxI0WgVyOj86hrXc8OnpjnPmuhMQV i4pkL4Y1/UxZepd0b6QOTUC+LQvsWL008XLUr0SPm1d2Co9sxyzN8i0pXh07bsm0 sOflS6DtwWSNenX/OVVQWk0r5amNwiFFpiw7tBWIeXYi4glhyizqdGjbzxRjxJUf QfFex23RAWtf/1ZrvqQO =kJw8 -----END PGP SIGNATURE----- Merge tag 'for-v4.5-rc/omap-critical-fixes-a' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into fixes ARM: OMAP2+: critical DRA7xx fix for v4.5-rc Force the DRA7xx Ethernet internal clock source to stay enabled per TI erratum i877: http://www.ti.com/lit/er/sprz429h/sprz429h.pdf Otherwise, if the Ethernet internal clock source is disabled, the chip will age prematurely, and the RGMII I/O timing will soon fail to meet the delay time and skew specifications for 1000Mbps Ethernet. This fix should go in as soon as possible. Basic build, boot, and PM test results are available here: http://www.pwsan.com/omap/testlogs/omap-critical-fixes-for-v4.5-rc/20160307014209/ * tag 'for-v4.5-rc/omap-critical-fixes-a' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending: ARM: dts: dra7: do not gate cpsw clock due to errata i877 ARM: OMAP2+: hwmod: Introduce ti,no-idle dt property Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson
commit
1dea581f86
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@ -23,6 +23,7 @@ Optional properties:
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during suspend.
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- ti,no-reset-on-init: When present, the module should not be reset at init
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- ti,no-idle-on-init: When present, the module should not be idled at init
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- ti,no-idle: When present, the module is never allowed to idle.
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Example:
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@ -1500,6 +1500,16 @@
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0x48485200 0x2E00>;
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#address-cells = <1>;
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#size-cells = <1>;
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/*
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* Do not allow gating of cpsw clock as workaround
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* for errata i877. Keeping internal clock disabled
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* causes the device switching characteristics
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* to degrade over time and eventually fail to meet
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* the data manual delay time/skew specs.
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*/
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ti,no-idle;
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/*
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* rx_thresh_pend
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* rx_pend
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@ -2200,6 +2200,11 @@ static int _enable(struct omap_hwmod *oh)
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*/
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static int _idle(struct omap_hwmod *oh)
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{
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if (oh->flags & HWMOD_NO_IDLE) {
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oh->_int_flags |= _HWMOD_SKIP_ENABLE;
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return 0;
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}
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pr_debug("omap_hwmod: %s: idling\n", oh->name);
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if (oh->_state != _HWMOD_STATE_ENABLED) {
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@ -2504,6 +2509,8 @@ static int __init _init(struct omap_hwmod *oh, void *data)
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oh->flags |= HWMOD_INIT_NO_RESET;
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if (of_find_property(np, "ti,no-idle-on-init", NULL))
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oh->flags |= HWMOD_INIT_NO_IDLE;
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if (of_find_property(np, "ti,no-idle", NULL))
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oh->flags |= HWMOD_NO_IDLE;
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}
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oh->_state = _HWMOD_STATE_INITIALIZED;
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@ -2630,7 +2637,7 @@ static void __init _setup_postsetup(struct omap_hwmod *oh)
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* XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
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* it should be set by the core code as a runtime flag during startup
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*/
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if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
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if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
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(postsetup_state == _HWMOD_STATE_IDLE)) {
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oh->_int_flags |= _HWMOD_SKIP_ENABLE;
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postsetup_state = _HWMOD_STATE_ENABLED;
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@ -525,6 +525,8 @@ struct omap_hwmod_omap4_prcm {
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* or idled.
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* HWMOD_OPT_CLKS_NEEDED: The optional clocks are needed for the module to
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* operate and they need to be handled at the same time as the main_clk.
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* HWMOD_NO_IDLE: Do not idle the hwmod at all. Useful to handle certain
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* IPs like CPSW on DRA7, where clocks to this module cannot be disabled.
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*/
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#define HWMOD_SWSUP_SIDLE (1 << 0)
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#define HWMOD_SWSUP_MSTANDBY (1 << 1)
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@ -541,6 +543,7 @@ struct omap_hwmod_omap4_prcm {
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#define HWMOD_SWSUP_SIDLE_ACT (1 << 12)
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#define HWMOD_RECONFIG_IO_CHAIN (1 << 13)
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#define HWMOD_OPT_CLKS_NEEDED (1 << 14)
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#define HWMOD_NO_IDLE (1 << 15)
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/*
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* omap_hwmod._int_flags definitions
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