diff options
| author | Hung-Te Lin <hungte@chromium.org> | 2013-09-24 15:51:05 +0800 |
|---|---|---|
| committer | Isaac Christensen <isaac.christensen@se-eng.com> | 2014-08-18 19:03:39 +0200 |
| commit | 12b121f3fef61d6a346c2575266a9cb46bb9d31f (patch) | |
| tree | 24d4024371da777582f76b5cec6448272859dc03 /src/cpu/samsung/exynos5250/power.c | |
| parent | 68aef1169239cc5d33fb36f05cd32d7e062b7743 (diff) | |
arm/exynos: Allow releasing UART retention for resume.
The UART / serial console is put in retention state by kernel during suspend /
resume path, which caused Coreboot not able to print any messages during resume.
Sending values to the padret_uart_opt inside PMU may release UART, but that may
also cause unexpected output when kernel is back. However, it's still very
helpful when we are debugging suspend/resume inside Coreboot.
To get UART message on resume, call wakeup_enable_uart() in boot block or
romstage (before console_init).
Change-Id: Ib5759cb402c6e018d9dba14fad8b61f6a1b1a265
Reviewed-on: https://chromium-review.googlesource.com/170440
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 547fbbfe2eeb6da4e161f36be2caf8099f9eac9b)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6649
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/cpu/samsung/exynos5250/power.c')
| -rw-r--r-- | src/cpu/samsung/exynos5250/power.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/cpu/samsung/exynos5250/power.c b/src/cpu/samsung/exynos5250/power.c index e873129f64..c9d620a958 100644 --- a/src/cpu/samsung/exynos5250/power.c +++ b/src/cpu/samsung/exynos5250/power.c @@ -83,3 +83,8 @@ void power_enable_xclkout(void) clrsetbits_le32(&exynos_power->pmu_debug, PMU_DEBUG_CLKOUT_SEL_MASK, PMU_DEBUG_XXTI); } + +void power_release_uart_retention(void) +{ + writel(1 << 28, &exynos_power->padret_uart_opt); +} |