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@xxxxxxxxx>
> Cc: Alexey Firago <alexey_firago@xxxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Michael Turquette <mturquette@xxxxxxxxxxxx>
> Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> Cc: linux-renesas-soc@xxxxxxxxxxxxxxx
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Tested-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> 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,
--
Regards,
Laurent Pinchart
