| Message ID | 20181213161528.20318-1-marek.vasut+renesas@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | [V3] clk: vc5: Add suspend/resume support | expand |
Hi Marek, Thank you for the patch. On Thursday, 13 December 2018 18:15:28 EET Marek Vasut wrote: > Add simple suspend/resume handlers to the driver to restore the chip > configuration after resume. It is possible that the chip was configured > with non-default values before suspend-resume cycle and that the chip > is powered down during this cycle, so the configuration could get lost. > > Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> > Cc: Alexey Firago <alexey_firago@mentor.com> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > Cc: Michael Turquette <mturquette@baylibre.com> > Cc: Stephen Boyd <sboyd@codeaurora.org> > Cc: linux-renesas-soc@vger.kernel.org Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > V2: Replace ifdef with __maybe_unused > Simplify return value handling in resume > V3: Drop useless regcache_sync() call from suspend callback > (thanks Laurent for testing with working DU) > --- > drivers/clk/clk-versaclock5.c | 25 +++++++++++++++++++++++++ > 1 file changed, 25 insertions(+) > > diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c > index decffb3826ec..5b393e711e94 100644 > --- a/drivers/clk/clk-versaclock5.c > +++ b/drivers/clk/clk-versaclock5.c > @@ -906,6 +906,28 @@ static int vc5_remove(struct i2c_client *client) > return 0; > } > > +static int __maybe_unused vc5_suspend(struct device *dev) > +{ > + struct vc5_driver_data *vc5 = dev_get_drvdata(dev); > + > + regcache_cache_only(vc5->regmap, true); > + regcache_mark_dirty(vc5->regmap); > + > + return 0; > +} > + > +static int __maybe_unused vc5_resume(struct device *dev) > +{ > + struct vc5_driver_data *vc5 = dev_get_drvdata(dev); > + int ret; > + > + regcache_cache_only(vc5->regmap, false); > + ret = regcache_sync(vc5->regmap); > + if (ret) > + dev_err(dev, "Failed to restore register map: %d\n", ret); > + return ret; > +} > + > static const struct vc5_chip_info idt_5p49v5923_info = { > .model = IDT_VC5_5P49V5923, > .clk_fod_cnt = 2, > @@ -961,9 +983,12 @@ static const struct of_device_id clk_vc5_of_match[] = { > }; > MODULE_DEVICE_TABLE(of, clk_vc5_of_match); > > +static SIMPLE_DEV_PM_OPS(vc5_pm_ops, vc5_suspend, vc5_resume); > + > static struct i2c_driver vc5_driver = { > .driver = { > .name = "vc5", > + .pm = &vc5_pm_ops, > .of_match_table = clk_vc5_of_match, > }, > .probe = vc5_probe,
Quoting Marek Vasut (2018-12-13 08:15:28) > Add simple suspend/resume handlers to the driver to restore the chip > configuration after resume. It is possible that the chip was configured > with non-default values before suspend-resume cycle and that the chip > is powered down during this cycle, so the configuration could get lost. > > Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> > Cc: Alexey Firago <alexey_firago@mentor.com> > Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > Cc: Michael Turquette <mturquette@baylibre.com> > Cc: Stephen Boyd <sboyd@codeaurora.org> > Cc: linux-renesas-soc@vger.kernel.org > --- Applied to clk-next
diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c index decffb3826ec..5b393e711e94 100644 --- a/drivers/clk/clk-versaclock5.c +++ b/drivers/clk/clk-versaclock5.c @@ -906,6 +906,28 @@ static int vc5_remove(struct i2c_client *client) return 0; } +static int __maybe_unused vc5_suspend(struct device *dev) +{ + struct vc5_driver_data *vc5 = dev_get_drvdata(dev); + + regcache_cache_only(vc5->regmap, true); + regcache_mark_dirty(vc5->regmap); + + return 0; +} + +static int __maybe_unused vc5_resume(struct device *dev) +{ + struct vc5_driver_data *vc5 = dev_get_drvdata(dev); + int ret; + + regcache_cache_only(vc5->regmap, false); + ret = regcache_sync(vc5->regmap); + if (ret) + dev_err(dev, "Failed to restore register map: %d\n", ret); + return ret; +} + static const struct vc5_chip_info idt_5p49v5923_info = { .model = IDT_VC5_5P49V5923, .clk_fod_cnt = 2, @@ -961,9 +983,12 @@ static const struct of_device_id clk_vc5_of_match[] = { }; MODULE_DEVICE_TABLE(of, clk_vc5_of_match); +static SIMPLE_DEV_PM_OPS(vc5_pm_ops, vc5_suspend, vc5_resume); + static struct i2c_driver vc5_driver = { .driver = { .name = "vc5", + .pm = &vc5_pm_ops, .of_match_table = clk_vc5_of_match, }, .probe = vc5_probe,
Add simple suspend/resume handlers to the driver to restore the chip configuration after resume. It is possible that the chip was configured with non-default values before suspend-resume cycle and that the chip is powered down during this cycle, so the configuration could get lost. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Alexey Firago <alexey_firago@mentor.com> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Michael Turquette <mturquette@baylibre.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: linux-renesas-soc@vger.kernel.org --- V2: Replace ifdef with __maybe_unused Simplify return value handling in resume V3: Drop useless regcache_sync() call from suspend callback (thanks Laurent for testing with working DU) --- drivers/clk/clk-versaclock5.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)