diff options
| author |   Claudiu Beznea <claudiu.beznea@microchip.com> | 2021-10-11 14:27:05 +0300 |
|---|---|---|
| committer |   Stephen Boyd <sboyd@kernel.org> | 2021-10-26 18:27:41 -0700 |
| commit | 36971566ea7a519bcde1830f39b6aa37c34e0fb4 (patch) | |
| tree | 5e2bc834ef97c1b35b5ecce1cf7a01bc4c377cba /drivers/clk/at91/clk-utmi.c | |
| parent | clk: at91: check pmc node status before registering syscore ops (diff) | |
| download | wireguard-linux-36971566ea7a519bcde1830f39b6aa37c34e0fb4.tar.xz wireguard-linux-36971566ea7a519bcde1830f39b6aa37c34e0fb4.zip | |
clk: at91: re-factor clocks suspend/resume
SAMA5D2 and SAMA7G5 have a special power saving mode (backup mode) where
most of the SoC's components are powered off (including PMC). Resuming
from this mode is done with the help of bootloader. Peripherals are not
aware of the power saving mode thus most of them are disabling clocks in
proper suspend API and re-enable them in resume API without taking into
account the previously setup rate. Moreover some of the peripherals are
acting as wakeup sources and are not disabling the clocks in this
scenario, when suspending. Since backup mode cuts the power for
peripherals, in resume part these clocks needs to be re-configured.
The initial PMC suspend/resume code was designed only for SAMA5D2's PMC
(as it was the only one supporting backup mode). SAMA7G supports also
backup mode and its PMC is different (few new functionalities, different
registers offsets, different offsets in registers for each
functionalities). To address both SAMA5D2 and SAMA7G5 PMC add
.save_context()/.resume_context() support to each clocks driver and call
this from PMC driver.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-2-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/at91/clk-utmi.c')
| -rw-r--r-- | drivers/clk/at91/clk-utmi.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c index df9f3fc3b6a6..a22c10d9a1b9 100644 --- a/drivers/clk/at91/clk-utmi.c +++ b/drivers/clk/at91/clk-utmi.c @@ -23,6 +23,7 @@ struct clk_utmi { struct clk_hw hw; struct regmap *regmap_pmc; struct regmap *regmap_sfr; + struct at91_clk_pms pms; }; #define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw) @@ -113,11 +114,30 @@ static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw, return UTMI_RATE; } +static int clk_utmi_save_context(struct clk_hw *hw) +{ + struct clk_utmi *utmi = to_clk_utmi(hw); + + utmi->pms.status = clk_utmi_is_prepared(hw); + + return 0; +} + +static void clk_utmi_restore_context(struct clk_hw *hw) +{ + struct clk_utmi *utmi = to_clk_utmi(hw); + + if (utmi->pms.status) + clk_utmi_prepare(hw); +} + static const struct clk_ops utmi_ops = { .prepare = clk_utmi_prepare, .unprepare = clk_utmi_unprepare, .is_prepared = clk_utmi_is_prepared, .recalc_rate = clk_utmi_recalc_rate, + .save_context = clk_utmi_save_context, + .restore_context = clk_utmi_restore_context, }; static struct clk_hw * __init @@ -232,10 +252,29 @@ static int clk_utmi_sama7g5_is_prepared(struct clk_hw *hw) return 0; } +static int clk_utmi_sama7g5_save_context(struct clk_hw *hw) +{ + struct clk_utmi *utmi = to_clk_utmi(hw); + + utmi->pms.status = clk_utmi_sama7g5_is_prepared(hw); + + return 0; +} + +static void clk_utmi_sama7g5_restore_context(struct clk_hw *hw) +{ + struct clk_utmi *utmi = to_clk_utmi(hw); + + if (utmi->pms.status) + clk_utmi_sama7g5_prepare(hw); +} + static const struct clk_ops sama7g5_utmi_ops = { .prepare = clk_utmi_sama7g5_prepare, .is_prepared = clk_utmi_sama7g5_is_prepared, .recalc_rate = clk_utmi_recalc_rate, + .save_context = clk_utmi_sama7g5_save_context, + .restore_context = clk_utmi_sama7g5_restore_context, }; struct clk_hw * __init |