| Message ID | 20240621112303.1607621-7-claudiu.beznea.uj@bp.renesas.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | i2c: riic: Add support for Renesas RZ/G3S | expand |
Hi Claudiu, Thanks for the patch > -----Original Message----- > From: Claudiu <claudiu.beznea@tuxon.dev> > Sent: Friday, June 21, 2024 12:23 PM > Subject: [PATCH 06/12] i2c: riic: Add suspend/resume support > > From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> > > Add suspend/resume support for the RIIC driver. This is necessary for the Renesas RZ/G3S SoC which > support suspend to deep sleep state where power to most of the SoC components is turned off. As a > result the I2C controller needs to be reconfigured after suspend/resume. For this, the reset line > was stored in the driver private data structure as well as i2c timings. > The reset line and I2C timings are necessary to re-initialize the controller after resume. > > Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> > --- > drivers/i2c/busses/i2c-riic.c | 66 +++++++++++++++++++++++++++++------ > 1 file changed, 55 insertions(+), 11 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index > 00fb09786e48..f9b9e92570d8 100644 > --- a/drivers/i2c/busses/i2c-riic.c > +++ b/drivers/i2c/busses/i2c-riic.c > @@ -105,6 +105,8 @@ struct riic_dev { > struct completion msg_done; > struct i2c_adapter adapter; > struct clk *clk; > + struct reset_control *rstc; > + struct i2c_timings i2c_t; > }; > > struct riic_irq_desc { > @@ -306,11 +308,12 @@ static const struct i2c_algorithm riic_algo = { > .functionality = riic_func, > }; > > -static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t) > +static int riic_init_hw(struct riic_dev *riic) > { > int ret; > unsigned long rate; > int total_ticks, cks, brl, brh; > + struct i2c_timings *t = &riic->i2c_t; > struct device *dev = riic->adapter.dev.parent; > > if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) { @@ -429,8 +432,6 @@ static int > riic_i2c_probe(struct platform_device *pdev) > struct device *dev = &pdev->dev; > struct riic_dev *riic; > struct i2c_adapter *adap; > - struct i2c_timings i2c_t; > - struct reset_control *rstc; > int i, ret; > > riic = devm_kzalloc(dev, sizeof(*riic), GFP_KERNEL); @@ -447,16 +448,16 @@ static int > riic_i2c_probe(struct platform_device *pdev) > return PTR_ERR(riic->clk); > } > > - rstc = devm_reset_control_get_optional_exclusive(dev, NULL); > - if (IS_ERR(rstc)) > - return dev_err_probe(dev, PTR_ERR(rstc), > + riic->rstc = devm_reset_control_get_optional_exclusive(dev, NULL); > + if (IS_ERR(riic->rstc)) > + return dev_err_probe(dev, PTR_ERR(riic->rstc), > "Error: missing reset ctrl\n"); > > - ret = reset_control_deassert(rstc); > + ret = reset_control_deassert(riic->rstc); > if (ret) > return ret; > > - ret = devm_add_action_or_reset(dev, riic_reset_control_assert, rstc); > + ret = devm_add_action_or_reset(dev, riic_reset_control_assert, > +riic->rstc); > if (ret) > return ret; > > @@ -485,13 +486,13 @@ static int riic_i2c_probe(struct platform_device *pdev) > > init_completion(&riic->msg_done); > > - i2c_parse_fw_timings(dev, &i2c_t, true); > + i2c_parse_fw_timings(dev, &riic->i2c_t, true); > > pm_runtime_set_autosuspend_delay(dev, 0); > pm_runtime_use_autosuspend(dev); > pm_runtime_enable(dev); > > - ret = riic_init_hw(riic, &i2c_t); > + ret = riic_init_hw(riic); > if (ret) > goto out; > > @@ -501,7 +502,7 @@ static int riic_i2c_probe(struct platform_device *pdev) > > platform_set_drvdata(pdev, riic); > > - dev_info(dev, "registered with %dHz bus speed\n", i2c_t.bus_freq_hz); > + dev_info(dev, "registered with %dHz bus speed\n", > +riic->i2c_t.bus_freq_hz); > return 0; > > out: > @@ -561,6 +562,48 @@ static const struct riic_of_data riic_rz_v2h_info = { > }, > }; > > +static int riic_i2c_suspend(struct device *dev) { > + struct riic_dev *riic = dev_get_drvdata(dev); > + int ret; > + > + ret = pm_runtime_resume_and_get(dev); > + if (ret) > + return ret; > + > + i2c_mark_adapter_suspended(&riic->adapter); > + > + /* Disable output on SDA, SCL pins. */ > + riic_clear_set_bit(riic, ICCR1_ICE, 0, RIIC_ICCR1); > + > + pm_runtime_mark_last_busy(dev); > + pm_runtime_put_sync(dev); > + > + return reset_control_assert(riic->rstc); } > + > +static int riic_i2c_resume(struct device *dev) { > + struct riic_dev *riic = dev_get_drvdata(dev); > + int ret; > + > + ret = reset_control_deassert(riic->rstc); > + if (ret) > + return ret; > + > + ret = riic_init_hw(riic); > + if (ret) > + return ret; On error case we need to assert back?? Cheers, Biju > + > + i2c_mark_adapter_resumed(&riic->adapter); > + > + return 0; > +} > + > +static const struct dev_pm_ops riic_i2c_pm_ops = { > + SYSTEM_SLEEP_PM_OPS(riic_i2c_suspend, riic_i2c_resume) }; > + > static const struct of_device_id riic_i2c_dt_ids[] = { > { .compatible = "renesas,riic-rz", .data = &riic_rz_a_info }, > { .compatible = "renesas,riic-r9a09g057", .data = &riic_rz_v2h_info }, @@ -573,6 +616,7 @@ > static struct platform_driver riic_i2c_driver = { > .driver = { > .name = "i2c-riic", > .of_match_table = riic_i2c_dt_ids, > + .pm = pm_ptr(&riic_i2c_pm_ops), > }, > }; > > -- > 2.39.2 >
On 21.06.2024 15:30, Biju Das wrote: > Hi Claudiu, > > Thanks for the patch > >> -----Original Message----- >> From: Claudiu <claudiu.beznea@tuxon.dev> >> Sent: Friday, June 21, 2024 12:23 PM >> Subject: [PATCH 06/12] i2c: riic: Add suspend/resume support >> >> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> >> >> Add suspend/resume support for the RIIC driver. This is necessary for the Renesas RZ/G3S SoC which >> support suspend to deep sleep state where power to most of the SoC components is turned off. As a >> result the I2C controller needs to be reconfigured after suspend/resume. For this, the reset line >> was stored in the driver private data structure as well as i2c timings. >> The reset line and I2C timings are necessary to re-initialize the controller after resume. >> >> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com> >> --- >> drivers/i2c/busses/i2c-riic.c | 66 +++++++++++++++++++++++++++++------ >> 1 file changed, 55 insertions(+), 11 deletions(-) >> >> diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index >> 00fb09786e48..f9b9e92570d8 100644 >> --- a/drivers/i2c/busses/i2c-riic.c >> +++ b/drivers/i2c/busses/i2c-riic.c >> @@ -105,6 +105,8 @@ struct riic_dev { >> struct completion msg_done; >> struct i2c_adapter adapter; >> struct clk *clk; >> + struct reset_control *rstc; >> + struct i2c_timings i2c_t; >> }; >> >> struct riic_irq_desc { >> @@ -306,11 +308,12 @@ static const struct i2c_algorithm riic_algo = { >> .functionality = riic_func, >> }; >> >> -static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t) >> +static int riic_init_hw(struct riic_dev *riic) >> { >> int ret; >> unsigned long rate; >> int total_ticks, cks, brl, brh; >> + struct i2c_timings *t = &riic->i2c_t; >> struct device *dev = riic->adapter.dev.parent; >> >> if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) { @@ -429,8 +432,6 @@ static int >> riic_i2c_probe(struct platform_device *pdev) >> struct device *dev = &pdev->dev; >> struct riic_dev *riic; >> struct i2c_adapter *adap; >> - struct i2c_timings i2c_t; >> - struct reset_control *rstc; >> int i, ret; >> >> riic = devm_kzalloc(dev, sizeof(*riic), GFP_KERNEL); @@ -447,16 +448,16 @@ static int >> riic_i2c_probe(struct platform_device *pdev) >> return PTR_ERR(riic->clk); >> } >> >> - rstc = devm_reset_control_get_optional_exclusive(dev, NULL); >> - if (IS_ERR(rstc)) >> - return dev_err_probe(dev, PTR_ERR(rstc), >> + riic->rstc = devm_reset_control_get_optional_exclusive(dev, NULL); >> + if (IS_ERR(riic->rstc)) >> + return dev_err_probe(dev, PTR_ERR(riic->rstc), >> "Error: missing reset ctrl\n"); >> >> - ret = reset_control_deassert(rstc); >> + ret = reset_control_deassert(riic->rstc); >> if (ret) >> return ret; >> >> - ret = devm_add_action_or_reset(dev, riic_reset_control_assert, rstc); >> + ret = devm_add_action_or_reset(dev, riic_reset_control_assert, >> +riic->rstc); >> if (ret) >> return ret; >> >> @@ -485,13 +486,13 @@ static int riic_i2c_probe(struct platform_device *pdev) >> >> init_completion(&riic->msg_done); >> >> - i2c_parse_fw_timings(dev, &i2c_t, true); >> + i2c_parse_fw_timings(dev, &riic->i2c_t, true); >> >> pm_runtime_set_autosuspend_delay(dev, 0); >> pm_runtime_use_autosuspend(dev); >> pm_runtime_enable(dev); >> >> - ret = riic_init_hw(riic, &i2c_t); >> + ret = riic_init_hw(riic); >> if (ret) >> goto out; >> >> @@ -501,7 +502,7 @@ static int riic_i2c_probe(struct platform_device *pdev) >> >> platform_set_drvdata(pdev, riic); >> >> - dev_info(dev, "registered with %dHz bus speed\n", i2c_t.bus_freq_hz); >> + dev_info(dev, "registered with %dHz bus speed\n", >> +riic->i2c_t.bus_freq_hz); >> return 0; >> >> out: >> @@ -561,6 +562,48 @@ static const struct riic_of_data riic_rz_v2h_info = { >> }, >> }; >> >> +static int riic_i2c_suspend(struct device *dev) { >> + struct riic_dev *riic = dev_get_drvdata(dev); >> + int ret; >> + >> + ret = pm_runtime_resume_and_get(dev); >> + if (ret) >> + return ret; >> + >> + i2c_mark_adapter_suspended(&riic->adapter); >> + >> + /* Disable output on SDA, SCL pins. */ >> + riic_clear_set_bit(riic, ICCR1_ICE, 0, RIIC_ICCR1); >> + >> + pm_runtime_mark_last_busy(dev); >> + pm_runtime_put_sync(dev); >> + >> + return reset_control_assert(riic->rstc); } >> + >> +static int riic_i2c_resume(struct device *dev) { >> + struct riic_dev *riic = dev_get_drvdata(dev); >> + int ret; >> + >> + ret = reset_control_deassert(riic->rstc); >> + if (ret) >> + return ret; >> + >> + ret = riic_init_hw(riic); >> + if (ret) >> + return ret; > > On error case we need to assert back?? Yes, it would be better as we cannot recover though other paths anymore, if that happens. > > Cheers, > Biju > >> + >> + i2c_mark_adapter_resumed(&riic->adapter); >> + >> + return 0; >> +} >> + >> +static const struct dev_pm_ops riic_i2c_pm_ops = { >> + SYSTEM_SLEEP_PM_OPS(riic_i2c_suspend, riic_i2c_resume) }; >> + >> static const struct of_device_id riic_i2c_dt_ids[] = { >> { .compatible = "renesas,riic-rz", .data = &riic_rz_a_info }, >> { .compatible = "renesas,riic-r9a09g057", .data = &riic_rz_v2h_info }, @@ -573,6 +616,7 @@ >> static struct platform_driver riic_i2c_driver = { >> .driver = { >> .name = "i2c-riic", >> .of_match_table = riic_i2c_dt_ids, >> + .pm = pm_ptr(&riic_i2c_pm_ops), >> }, >> }; >> >> -- >> 2.39.2 >> >
diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c index 00fb09786e48..f9b9e92570d8 100644 --- a/drivers/i2c/busses/i2c-riic.c +++ b/drivers/i2c/busses/i2c-riic.c @@ -105,6 +105,8 @@ struct riic_dev { struct completion msg_done; struct i2c_adapter adapter; struct clk *clk; + struct reset_control *rstc; + struct i2c_timings i2c_t; }; struct riic_irq_desc { @@ -306,11 +308,12 @@ static const struct i2c_algorithm riic_algo = { .functionality = riic_func, }; -static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t) +static int riic_init_hw(struct riic_dev *riic) { int ret; unsigned long rate; int total_ticks, cks, brl, brh; + struct i2c_timings *t = &riic->i2c_t; struct device *dev = riic->adapter.dev.parent; if (t->bus_freq_hz > I2C_MAX_FAST_MODE_FREQ) { @@ -429,8 +432,6 @@ static int riic_i2c_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct riic_dev *riic; struct i2c_adapter *adap; - struct i2c_timings i2c_t; - struct reset_control *rstc; int i, ret; riic = devm_kzalloc(dev, sizeof(*riic), GFP_KERNEL); @@ -447,16 +448,16 @@ static int riic_i2c_probe(struct platform_device *pdev) return PTR_ERR(riic->clk); } - rstc = devm_reset_control_get_optional_exclusive(dev, NULL); - if (IS_ERR(rstc)) - return dev_err_probe(dev, PTR_ERR(rstc), + riic->rstc = devm_reset_control_get_optional_exclusive(dev, NULL); + if (IS_ERR(riic->rstc)) + return dev_err_probe(dev, PTR_ERR(riic->rstc), "Error: missing reset ctrl\n"); - ret = reset_control_deassert(rstc); + ret = reset_control_deassert(riic->rstc); if (ret) return ret; - ret = devm_add_action_or_reset(dev, riic_reset_control_assert, rstc); + ret = devm_add_action_or_reset(dev, riic_reset_control_assert, riic->rstc); if (ret) return ret; @@ -485,13 +486,13 @@ static int riic_i2c_probe(struct platform_device *pdev) init_completion(&riic->msg_done); - i2c_parse_fw_timings(dev, &i2c_t, true); + i2c_parse_fw_timings(dev, &riic->i2c_t, true); pm_runtime_set_autosuspend_delay(dev, 0); pm_runtime_use_autosuspend(dev); pm_runtime_enable(dev); - ret = riic_init_hw(riic, &i2c_t); + ret = riic_init_hw(riic); if (ret) goto out; @@ -501,7 +502,7 @@ static int riic_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, riic); - dev_info(dev, "registered with %dHz bus speed\n", i2c_t.bus_freq_hz); + dev_info(dev, "registered with %dHz bus speed\n", riic->i2c_t.bus_freq_hz); return 0; out: @@ -561,6 +562,48 @@ static const struct riic_of_data riic_rz_v2h_info = { }, }; +static int riic_i2c_suspend(struct device *dev) +{ + struct riic_dev *riic = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + return ret; + + i2c_mark_adapter_suspended(&riic->adapter); + + /* Disable output on SDA, SCL pins. */ + riic_clear_set_bit(riic, ICCR1_ICE, 0, RIIC_ICCR1); + + pm_runtime_mark_last_busy(dev); + pm_runtime_put_sync(dev); + + return reset_control_assert(riic->rstc); +} + +static int riic_i2c_resume(struct device *dev) +{ + struct riic_dev *riic = dev_get_drvdata(dev); + int ret; + + ret = reset_control_deassert(riic->rstc); + if (ret) + return ret; + + ret = riic_init_hw(riic); + if (ret) + return ret; + + i2c_mark_adapter_resumed(&riic->adapter); + + return 0; +} + +static const struct dev_pm_ops riic_i2c_pm_ops = { + SYSTEM_SLEEP_PM_OPS(riic_i2c_suspend, riic_i2c_resume) +}; + static const struct of_device_id riic_i2c_dt_ids[] = { { .compatible = "renesas,riic-rz", .data = &riic_rz_a_info }, { .compatible = "renesas,riic-r9a09g057", .data = &riic_rz_v2h_info }, @@ -573,6 +616,7 @@ static struct platform_driver riic_i2c_driver = { .driver = { .name = "i2c-riic", .of_match_table = riic_i2c_dt_ids, + .pm = pm_ptr(&riic_i2c_pm_ops), }, };