TononixOS/ubports_kernel_google_msm
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mmc: core: Fixup broken suspend and eMMC4.5 power off notify

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This patch fixes up the broken suspend sequence for eMMC with sleep
support. Additionally it reworks the eMMC4.5 Power Off Notification
feature so it fits together with the existing sleep feature.

The CMD0 based re-initialization of the eMMC at resume is re-introduced
to maintain compatiblity for devices using sleep.

A host shall use MMC_CAP2_POWEROFF_NOTIFY to enable the Power Off
Notification feature. We might be able to remove this cap later on,
if we think that Power Off Notification always is preferred over
sleep, even if the host is not able to cut the eMMC VCCQ power.

[merez@codeaurora.org: resolved various merge conflicts.
                       Fix in mmc_resume already exists]
(cherry picked from commit cec02a451276a70cdeb0576ec89d6b5b76e4e18b)
Change-Id: I4f29c213d745dcb1ec50b34b535657328042b4b2
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Saugata Das <saugata.das@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
(cherry picked from commit 91cf2698afab3f0707f739a02eb639205798f1dc)
This commit is contained in:
Maya Erez
2012-10-19 20:18:17 +02:00
committed by Stephen Boyd
parent f80b8d0ade
commit 6fbfb09306
6 changed files with 36 additions and 97 deletions
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4
include/linux/mmc/host.h
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@@ -249,10 +249,6 @@ struct mmc_host {
#define MMC_CAP2_SANITIZE (1 << 13) /* Support Sanitize */
#define MMC_CAP2_INIT_BKOPS (1 << 15) /* Need to set BKOPS_EN */
mmc_pm_flag_t pm_caps; /* supported pm features */
unsigned int power_notify_type;
#define MMC_HOST_PW_NOTIFY_NONE 0
#define MMC_HOST_PW_NOTIFY_SHORT 1
#define MMC_HOST_PW_NOTIFY_LONG 2
int clk_requests; /* internal reference counter */
unsigned int clk_delay; /* number of MCI clk hold cycles */