Re: [PATCH v3] clk: imx: imx8mp: Add pm_runtime support for power saving

From: Shengjiu Wang
Date: Thu Mar 21 2024 - 08:40:35 EST


On Thu, Mar 21, 2024 at 5:04 PM Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> wrote:
>
> On 21.03.2024 16:36:51, Shengjiu Wang wrote:
> > Add pm_runtime support for power saving. In pm runtime suspend
> > state the registers will be reseted, so add registers save
> > in pm runtime suspend and restore them in pm runtime resume.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@xxxxxxx>
> > Reviewed-by: Peng Fan <peng.fan@xxxxxxx>
> > ---
> > changes in v3:
> > - remove REGS_NUM, use the ARRAY_SIZE
> > - merge clk_imx8mp_audiomix_drvdata and clk_hw_onecell_data together.
>
> Look way nicer, but still room for improvement.
>
> > changes in v2:
> > - move pm_runtime_enable before the clk register
> >
> > drivers/clk/imx/clk-imx8mp-audiomix.c | 157 ++++++++++++++++++++++----
> > 1 file changed, 136 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/clk/imx/clk-imx8mp-audiomix.c b/drivers/clk/imx/clk-imx8mp-audiomix.c
> > index 55ed211a5e0b..5ae33bce8ad8 100644
> > --- a/drivers/clk/imx/clk-imx8mp-audiomix.c
> > +++ b/drivers/clk/imx/clk-imx8mp-audiomix.c
> > @@ -7,10 +7,12 @@
> >
> > #include <linux/clk-provider.h>
> > #include <linux/device.h>
> > +#include <linux/io.h>
> > #include <linux/mod_devicetable.h>
> > #include <linux/module.h>
> > #include <linux/of.h>
> > #include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> >
> > #include <dt-bindings/clock/imx8mp-clock.h>
> >
> > @@ -18,6 +20,7 @@
> >
> > #define CLKEN0 0x000
> > #define CLKEN1 0x004
> > +#define EARC 0x200
> > #define SAI1_MCLK_SEL 0x300
> > #define SAI2_MCLK_SEL 0x304
> > #define SAI3_MCLK_SEL 0x308
> > @@ -26,6 +29,11 @@
> > #define SAI7_MCLK_SEL 0x314
> > #define PDM_SEL 0x318
> > #define SAI_PLL_GNRL_CTL 0x400
> > +#define SAI_PLL_FDIVL_CTL0 0x404
> > +#define SAI_PLL_FDIVL_CTL1 0x408
> > +#define SAI_PLL_SSCG_CTL 0x40C
> > +#define SAI_PLL_MNIT_CTL 0x410
> > +#define IPG_LP_CTRL 0x504
> >
> > #define SAIn_MCLK1_PARENT(n) \
> > static const struct clk_parent_data \
> > @@ -182,26 +190,82 @@ static struct clk_imx8mp_audiomix_sel sels[] = {
> > CLK_SAIn(7)
> > };
> >
> > +static const u16 audiomix_regs[] = {
> > + CLKEN0,
> > + CLKEN1,
> > + EARC,
> > + SAI1_MCLK_SEL,
> > + SAI2_MCLK_SEL,
> > + SAI3_MCLK_SEL,
> > + SAI5_MCLK_SEL,
> > + SAI6_MCLK_SEL,
> > + SAI7_MCLK_SEL,
> > + PDM_SEL,
> > + SAI_PLL_GNRL_CTL,
> > + SAI_PLL_FDIVL_CTL0,
> > + SAI_PLL_FDIVL_CTL1,
> > + SAI_PLL_SSCG_CTL,
> > + SAI_PLL_MNIT_CTL,
> > + IPG_LP_CTRL,
> > +};
> > +
> > +struct clk_imx8mp_audiomix_priv {
> > + void __iomem *base;
> > + struct clk_hw_onecell_data *clk_hw_data;
> > + u32 regs_save[ARRAY_SIZE(audiomix_regs)];
>
> Put the "struct clk_hw_onecell_data clk_hw_data" at the end of the
> struct. Then allocating should be easier and you don't need the
> additional pointer.

Ok, will do this change in next version.

Best Regards
Shengjiu Wang
>
> Marc
>
> --
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