* [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply @ 2021-12-22 3:06 ` Michael Wu 0 siblings, 0 replies; 10+ messages in thread From: Michael Wu @ 2021-12-22 3:06 UTC (permalink / raw) To: ulf.hansson, mripard, wens, samuel, andre.przywara Cc: jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel, Michael Wu Because some platform has no regulator, only use discrete devices to supply power,For this situation, to use sd/mmc card, we add ocr manually Signed-off-by: Michael Wu <michael@allwinnertech.com> --- drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 2702736a1c57..afeefead6501 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, if (ret) return ret; + /** + * Some platforms has no regulator. Discrete devices are used instead. + * To support sd/mmc card, we need to add ocr manually. + */ + if (!host->mmc->ocr_avail) + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + + host->reg_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(host->reg_base)) return PTR_ERR(host->reg_base); -- 2.29.0 ^ permalink raw reply related [flat|nested] 10+ messages in thread
* [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply @ 2021-12-22 3:06 ` Michael Wu 0 siblings, 0 replies; 10+ messages in thread From: Michael Wu @ 2021-12-22 3:06 UTC (permalink / raw) To: ulf.hansson, mripard, wens, samuel, andre.przywara Cc: jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel, Michael Wu Because some platform has no regulator, only use discrete devices to supply power,For this situation, to use sd/mmc card, we add ocr manually Signed-off-by: Michael Wu <michael@allwinnertech.com> --- drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 2702736a1c57..afeefead6501 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, if (ret) return ret; + /** + * Some platforms has no regulator. Discrete devices are used instead. + * To support sd/mmc card, we need to add ocr manually. + */ + if (!host->mmc->ocr_avail) + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; + + host->reg_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(host->reg_base)) return PTR_ERR(host->reg_base); -- 2.29.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply 2021-12-22 3:06 ` Michael Wu @ 2021-12-28 16:49 ` Ulf Hansson -1 siblings, 0 replies; 10+ messages in thread From: Ulf Hansson @ 2021-12-28 16:49 UTC (permalink / raw) To: Michael Wu Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > Because some platform has no regulator, only use discrete devices > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > --- > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > index 2702736a1c57..afeefead6501 100644 > --- a/drivers/mmc/host/sunxi-mmc.c > +++ b/drivers/mmc/host/sunxi-mmc.c > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > if (ret) > return ret; > > + /** > + * Some platforms has no regulator. Discrete devices are used instead. > + * To support sd/mmc card, we need to add ocr manually. > + */ > + if (!host->mmc->ocr_avail) > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > + Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. Nevertheless, it seems reasonable to check that the ocr_avail gets set up correctly. And if it doesn't, perhaps we should print a warning and return an error code. > + > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(host->reg_base)) > return PTR_ERR(host->reg_base); Kind regards Uffe ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply @ 2021-12-28 16:49 ` Ulf Hansson 0 siblings, 0 replies; 10+ messages in thread From: Ulf Hansson @ 2021-12-28 16:49 UTC (permalink / raw) To: Michael Wu Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > Because some platform has no regulator, only use discrete devices > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > --- > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > index 2702736a1c57..afeefead6501 100644 > --- a/drivers/mmc/host/sunxi-mmc.c > +++ b/drivers/mmc/host/sunxi-mmc.c > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > if (ret) > return ret; > > + /** > + * Some platforms has no regulator. Discrete devices are used instead. > + * To support sd/mmc card, we need to add ocr manually. > + */ > + if (!host->mmc->ocr_avail) > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > + Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. Nevertheless, it seems reasonable to check that the ocr_avail gets set up correctly. And if it doesn't, perhaps we should print a warning and return an error code. > + > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(host->reg_base)) > return PTR_ERR(host->reg_base); Kind regards Uffe _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply 2021-12-28 16:49 ` Ulf Hansson @ 2021-12-31 8:27 ` michael -1 siblings, 0 replies; 10+ messages in thread From: michael @ 2021-12-31 8:27 UTC (permalink / raw) To: Ulf Hansson Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel > From: Ulf Hansson > Date: 2021-12-29 00:49 > To: Michael Wu > CC: mripard; wens; samuel; andre.przywara; jernej.skrabec; linux-mmc; linux-arm-kernel; linux-sunxi; linux-kernel > Subject: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply > On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > > > Because some platform has no regulator, only use discrete devices > > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > --- > > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > index 2702736a1c57..afeefead6501 100644 > > --- a/drivers/mmc/host/sunxi-mmc.c > > +++ b/drivers/mmc/host/sunxi-mmc.c > > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > > if (ret) > > return ret; > > > > + /** > > + * Some platforms has no regulator. Discrete devices are used instead. > > + * To support sd/mmc card, we need to add ocr manually. > > + */ > > + if (!host->mmc->ocr_avail) > > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > > + > > Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. > > Nevertheless, it seems reasonable to check that the ocr_avail gets set > up correctly. And if it doesn't, perhaps we should print a warning and > return an error code. > > > + > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > if (IS_ERR(host->reg_base)) > > return PTR_ERR(host->reg_base); > > Kind regards > Uffe Dear Uffe, Thanks for your suggestion. It is a better solution. I've modified my patch. Please check if it's reasonable. If it is, I'll re-sumbit it later. --- Subject: [PATCH v2] mmc: sunxi-mmc: check ocr_avail on resource request Some platforms have no regulator, discrete power devices are used instead. However, sunxi_mmc_probe does not catch this exception when regulator is absent in DTS. This leads to sd or eMMC init failure. To solve this, a fixed vmmc regulator must be hooked up in DTS, like this: reg_dummy_vmmc: dummy_vmmc { compatible = "regulator-fixed"; regulator-name = "dummy-vmmc"; regulator-min-microvolt = <500000>; regulator-max-microvolt = <3500000>; }; mmc0:mmc@4020000 { compatible = "allwinner,sun50i-a100-emmc"; device_type = "mmc0"; vmmc-supply = <®_dummy_vmmc>; } In this patch, we print an error message and abort the probe process if the regulator is not specified in DTS. Signed-off-by: Michael Wu <michael@allwinnertech.com> --- diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 2702736..0da74bd 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -1300,6 +1300,11 @@ if (ret) return ret; + if (!host->mmc->ocr_avail) { + dev_err(&pdev->dev, "Could not get mmc regulator\n"); + return -EINVAL; + } + host->reg_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(host->reg_base)) return PTR_ERR(host->reg_base); Best Regards, Michael Wu ^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply @ 2021-12-31 8:27 ` michael 0 siblings, 0 replies; 10+ messages in thread From: michael @ 2021-12-31 8:27 UTC (permalink / raw) To: Ulf Hansson Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel > From: Ulf Hansson > Date: 2021-12-29 00:49 > To: Michael Wu > CC: mripard; wens; samuel; andre.przywara; jernej.skrabec; linux-mmc; linux-arm-kernel; linux-sunxi; linux-kernel > Subject: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply > On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > > > Because some platform has no regulator, only use discrete devices > > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > --- > > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > index 2702736a1c57..afeefead6501 100644 > > --- a/drivers/mmc/host/sunxi-mmc.c > > +++ b/drivers/mmc/host/sunxi-mmc.c > > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > > if (ret) > > return ret; > > > > + /** > > + * Some platforms has no regulator. Discrete devices are used instead. > > + * To support sd/mmc card, we need to add ocr manually. > > + */ > > + if (!host->mmc->ocr_avail) > > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > > + > > Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. > > Nevertheless, it seems reasonable to check that the ocr_avail gets set > up correctly. And if it doesn't, perhaps we should print a warning and > return an error code. > > > + > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > if (IS_ERR(host->reg_base)) > > return PTR_ERR(host->reg_base); > > Kind regards > Uffe Dear Uffe, Thanks for your suggestion. It is a better solution. I've modified my patch. Please check if it's reasonable. If it is, I'll re-sumbit it later. --- Subject: [PATCH v2] mmc: sunxi-mmc: check ocr_avail on resource request Some platforms have no regulator, discrete power devices are used instead. However, sunxi_mmc_probe does not catch this exception when regulator is absent in DTS. This leads to sd or eMMC init failure. To solve this, a fixed vmmc regulator must be hooked up in DTS, like this: reg_dummy_vmmc: dummy_vmmc { compatible = "regulator-fixed"; regulator-name = "dummy-vmmc"; regulator-min-microvolt = <500000>; regulator-max-microvolt = <3500000>; }; mmc0:mmc@4020000 { compatible = "allwinner,sun50i-a100-emmc"; device_type = "mmc0"; vmmc-supply = <®_dummy_vmmc>; } In this patch, we print an error message and abort the probe process if the regulator is not specified in DTS. Signed-off-by: Michael Wu <michael@allwinnertech.com> --- diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c index 2702736..0da74bd 100644 --- a/drivers/mmc/host/sunxi-mmc.c +++ b/drivers/mmc/host/sunxi-mmc.c @@ -1300,6 +1300,11 @@ if (ret) return ret; + if (!host->mmc->ocr_avail) { + dev_err(&pdev->dev, "Could not get mmc regulator\n"); + return -EINVAL; + } + host->reg_base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(host->reg_base)) return PTR_ERR(host->reg_base); Best Regards, Michael Wu _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply 2021-12-31 8:27 ` michael @ 2021-12-31 12:14 ` Ulf Hansson -1 siblings, 0 replies; 10+ messages in thread From: Ulf Hansson @ 2021-12-31 12:14 UTC (permalink / raw) To: michael Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel On Fri, 31 Dec 2021 at 09:28, michael@allwinnertech.com <michael@allwinnertech.com> wrote: > > > From: Ulf Hansson > > Date: 2021-12-29 00:49 > > To: Michael Wu > > CC: mripard; wens; samuel; andre.przywara; jernej.skrabec; linux-mmc; linux-arm-kernel; linux-sunxi; linux-kernel > > Subject: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply > > On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > > > > > Because some platform has no regulator, only use discrete devices > > > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > > --- > > > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > > > 1 file changed, 8 insertions(+) > > > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > > index 2702736a1c57..afeefead6501 100644 > > > --- a/drivers/mmc/host/sunxi-mmc.c > > > +++ b/drivers/mmc/host/sunxi-mmc.c > > > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > > > if (ret) > > > return ret; > > > > > > + /** > > > + * Some platforms has no regulator. Discrete devices are used instead. > > > + * To support sd/mmc card, we need to add ocr manually. > > > + */ > > > + if (!host->mmc->ocr_avail) > > > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > > > + > > > > Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. > > > > Nevertheless, it seems reasonable to check that the ocr_avail gets set > > up correctly. And if it doesn't, perhaps we should print a warning and > > return an error code. > > > > > + > > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > > if (IS_ERR(host->reg_base)) > > > return PTR_ERR(host->reg_base); > > > > Kind regards > > Uffe > > Dear Uffe, > Thanks for your suggestion. It is a better solution. > I've modified my patch. Please check if it's reasonable. If it is, I'll re-sumbit it later. > > --- > Subject: [PATCH v2] mmc: sunxi-mmc: check ocr_avail on resource request > > Some platforms have no regulator, discrete power devices are used instead. > However, sunxi_mmc_probe does not catch this exception when regulator is > absent in DTS. This leads to sd or eMMC init failure. > To solve this, a fixed vmmc regulator must be hooked up in DTS, like this: > reg_dummy_vmmc: dummy_vmmc { > compatible = "regulator-fixed"; > regulator-name = "dummy-vmmc"; > regulator-min-microvolt = <500000>; > regulator-max-microvolt = <3500000>; The min/max should be set to the same value as you can't really change the voltage levels. If you know the voltage level that is supplied for your platform, then state this value - otherwise I would suggest picking 3.3V, which is rather commonly used for MMC/SD. > }; > mmc0:mmc@4020000 { > compatible = "allwinner,sun50i-a100-emmc"; > device_type = "mmc0"; > vmmc-supply = <®_dummy_vmmc>; > } > In this patch, we print an error message and abort the probe process if > the regulator is not specified in DTS. > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > --- > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > index 2702736..0da74bd 100644 > --- a/drivers/mmc/host/sunxi-mmc.c > +++ b/drivers/mmc/host/sunxi-mmc.c > @@ -1300,6 +1300,11 @@ > if (ret) > return ret; > > + if (!host->mmc->ocr_avail) { > + dev_err(&pdev->dev, "Could not get mmc regulator\n"); > + return -EINVAL; > + } > + > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(host->reg_base)) > return PTR_ERR(host->reg_base); > > Best Regards, > Michael Wu Yep, this looks good to me! Kind regards Uffe ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply @ 2021-12-31 12:14 ` Ulf Hansson 0 siblings, 0 replies; 10+ messages in thread From: Ulf Hansson @ 2021-12-31 12:14 UTC (permalink / raw) To: michael Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel On Fri, 31 Dec 2021 at 09:28, michael@allwinnertech.com <michael@allwinnertech.com> wrote: > > > From: Ulf Hansson > > Date: 2021-12-29 00:49 > > To: Michael Wu > > CC: mripard; wens; samuel; andre.przywara; jernej.skrabec; linux-mmc; linux-arm-kernel; linux-sunxi; linux-kernel > > Subject: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply > > On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > > > > > Because some platform has no regulator, only use discrete devices > > > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > > --- > > > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > > > 1 file changed, 8 insertions(+) > > > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > > index 2702736a1c57..afeefead6501 100644 > > > --- a/drivers/mmc/host/sunxi-mmc.c > > > +++ b/drivers/mmc/host/sunxi-mmc.c > > > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > > > if (ret) > > > return ret; > > > > > > + /** > > > + * Some platforms has no regulator. Discrete devices are used instead. > > > + * To support sd/mmc card, we need to add ocr manually. > > > + */ > > > + if (!host->mmc->ocr_avail) > > > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > > > + > > > > Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. > > > > Nevertheless, it seems reasonable to check that the ocr_avail gets set > > up correctly. And if it doesn't, perhaps we should print a warning and > > return an error code. > > > > > + > > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > > if (IS_ERR(host->reg_base)) > > > return PTR_ERR(host->reg_base); > > > > Kind regards > > Uffe > > Dear Uffe, > Thanks for your suggestion. It is a better solution. > I've modified my patch. Please check if it's reasonable. If it is, I'll re-sumbit it later. > > --- > Subject: [PATCH v2] mmc: sunxi-mmc: check ocr_avail on resource request > > Some platforms have no regulator, discrete power devices are used instead. > However, sunxi_mmc_probe does not catch this exception when regulator is > absent in DTS. This leads to sd or eMMC init failure. > To solve this, a fixed vmmc regulator must be hooked up in DTS, like this: > reg_dummy_vmmc: dummy_vmmc { > compatible = "regulator-fixed"; > regulator-name = "dummy-vmmc"; > regulator-min-microvolt = <500000>; > regulator-max-microvolt = <3500000>; The min/max should be set to the same value as you can't really change the voltage levels. If you know the voltage level that is supplied for your platform, then state this value - otherwise I would suggest picking 3.3V, which is rather commonly used for MMC/SD. > }; > mmc0:mmc@4020000 { > compatible = "allwinner,sun50i-a100-emmc"; > device_type = "mmc0"; > vmmc-supply = <®_dummy_vmmc>; > } > In this patch, we print an error message and abort the probe process if > the regulator is not specified in DTS. > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > --- > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > index 2702736..0da74bd 100644 > --- a/drivers/mmc/host/sunxi-mmc.c > +++ b/drivers/mmc/host/sunxi-mmc.c > @@ -1300,6 +1300,11 @@ > if (ret) > return ret; > > + if (!host->mmc->ocr_avail) { > + dev_err(&pdev->dev, "Could not get mmc regulator\n"); > + return -EINVAL; > + } > + > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > if (IS_ERR(host->reg_base)) > return PTR_ERR(host->reg_base); > > Best Regards, > Michael Wu Yep, this looks good to me! Kind regards Uffe _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply 2021-12-31 12:14 ` Ulf Hansson @ 2021-12-31 14:06 ` michael -1 siblings, 0 replies; 10+ messages in thread From: michael @ 2021-12-31 14:06 UTC (permalink / raw) To: Ulf Hansson Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel > On Fri, 31 Dec 2021 at 09:28, michael@allwinnertech.com > <michael@allwinnertech.com> wrote: > > > > > From: Ulf Hansson > > > Date: 2021-12-29 00:49 > > > To: Michael Wu > > > CC: mripard; wens; samuel; andre.przywara; jernej.skrabec; linux-mmc; linux-arm-kernel; linux-sunxi; linux-kernel > > > Subject: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply > > > On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > > > > > > > Because some platform has no regulator, only use discrete devices > > > > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > > > > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > > > --- > > > > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > > > > 1 file changed, 8 insertions(+) > > > > > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > > > index 2702736a1c57..afeefead6501 100644 > > > > --- a/drivers/mmc/host/sunxi-mmc.c > > > > +++ b/drivers/mmc/host/sunxi-mmc.c > > > > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > > > > if (ret) > > > > return ret; > > > > > > > > + /** > > > > + * Some platforms has no regulator. Discrete devices are used instead. > > > > + * To support sd/mmc card, we need to add ocr manually. > > > > + */ > > > > + if (!host->mmc->ocr_avail) > > > > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > > > > + > > > > > > Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. > > > > > > Nevertheless, it seems reasonable to check that the ocr_avail gets set > > > up correctly. And if it doesn't, perhaps we should print a warning and > > > return an error code. > > > > > > > + > > > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > > > if (IS_ERR(host->reg_base)) > > > > return PTR_ERR(host->reg_base); > > > > > > Kind regards > > > Uffe > > > > Dear Uffe, > > Thanks for your suggestion. It is a better solution. > > I've modified my patch. Please check if it's reasonable. If it is, I'll re-sumbit it later. > > > > --- > > Subject: [PATCH v2] mmc: sunxi-mmc: check ocr_avail on resource request > > > > Some platforms have no regulator, discrete power devices are used instead. > > However, sunxi_mmc_probe does not catch this exception when regulator is > > absent in DTS. This leads to sd or eMMC init failure. > > To solve this, a fixed vmmc regulator must be hooked up in DTS, like this: > > reg_dummy_vmmc: dummy_vmmc { > > compatible = "regulator-fixed"; > > regulator-name = "dummy-vmmc"; > > regulator-min-microvolt = <500000>; > > regulator-max-microvolt = <3500000>; > > The min/max should be set to the same value as you can't really change > the voltage levels. > > If you know the voltage level that is supplied for your platform, then > state this value - otherwise I would suggest picking 3.3V, which is > rather commonly used for MMC/SD. Okay. The supplied voltage is 2.7V~3.6V. l'll correct the min/max value to 3.3V: regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; > > }; > > mmc0:mmc@4020000 { > > compatible = "allwinner,sun50i-a100-emmc"; > > device_type = "mmc0"; > > vmmc-supply = <®_dummy_vmmc>; > > } > > In this patch, we print an error message and abort the probe process if > > the regulator is not specified in DTS. > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > --- > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > index 2702736..0da74bd 100644 > > --- a/drivers/mmc/host/sunxi-mmc.c > > +++ b/drivers/mmc/host/sunxi-mmc.c > > @@ -1300,6 +1300,11 @@ > > if (ret) > > return ret; > > > > + if (!host->mmc->ocr_avail) { > > + dev_err(&pdev->dev, "Could not get mmc regulator\n"); > > + return -EINVAL; > > + } > > + > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > if (IS_ERR(host->reg_base)) > > return PTR_ERR(host->reg_base); > > > > Best Regards, > > Michael Wu > > Yep, this looks good to me! > > Kind regards > Uffe I'll submit the patch once I get back to work. Thanks for your effort and happy new year :) Best Regards, Michael Wu _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply @ 2021-12-31 14:06 ` michael 0 siblings, 0 replies; 10+ messages in thread From: michael @ 2021-12-31 14:06 UTC (permalink / raw) To: Ulf Hansson Cc: mripard, wens, samuel, andre.przywara, jernej.skrabec, linux-mmc, linux-arm-kernel, linux-sunxi, linux-kernel > On Fri, 31 Dec 2021 at 09:28, michael@allwinnertech.com > <michael@allwinnertech.com> wrote: > > > > > From: Ulf Hansson > > > Date: 2021-12-29 00:49 > > > To: Michael Wu > > > CC: mripard; wens; samuel; andre.przywara; jernej.skrabec; linux-mmc; linux-arm-kernel; linux-sunxi; linux-kernel > > > Subject: Re: [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply > > > On Wed, 22 Dec 2021 at 04:07, Michael Wu <michael@allwinnertech.com> wrote: > > > > > > > > Because some platform has no regulator, only use discrete devices > > > > to supply power,For this situation, to use sd/mmc card, we add ocr manually > > > > > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > > > --- > > > > drivers/mmc/host/sunxi-mmc.c | 8 ++++++++ > > > > 1 file changed, 8 insertions(+) > > > > > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > > > index 2702736a1c57..afeefead6501 100644 > > > > --- a/drivers/mmc/host/sunxi-mmc.c > > > > +++ b/drivers/mmc/host/sunxi-mmc.c > > > > @@ -1300,6 +1300,14 @@ static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host, > > > > if (ret) > > > > return ret; > > > > > > > > + /** > > > > + * Some platforms has no regulator. Discrete devices are used instead. > > > > + * To support sd/mmc card, we need to add ocr manually. > > > > + */ > > > > + if (!host->mmc->ocr_avail) > > > > + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34; > > > > + > > > > > > Rather than doing this, I suggest you hook up a fixed vmmc regulator in the DTS. > > > > > > Nevertheless, it seems reasonable to check that the ocr_avail gets set > > > up correctly. And if it doesn't, perhaps we should print a warning and > > > return an error code. > > > > > > > + > > > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > > > if (IS_ERR(host->reg_base)) > > > > return PTR_ERR(host->reg_base); > > > > > > Kind regards > > > Uffe > > > > Dear Uffe, > > Thanks for your suggestion. It is a better solution. > > I've modified my patch. Please check if it's reasonable. If it is, I'll re-sumbit it later. > > > > --- > > Subject: [PATCH v2] mmc: sunxi-mmc: check ocr_avail on resource request > > > > Some platforms have no regulator, discrete power devices are used instead. > > However, sunxi_mmc_probe does not catch this exception when regulator is > > absent in DTS. This leads to sd or eMMC init failure. > > To solve this, a fixed vmmc regulator must be hooked up in DTS, like this: > > reg_dummy_vmmc: dummy_vmmc { > > compatible = "regulator-fixed"; > > regulator-name = "dummy-vmmc"; > > regulator-min-microvolt = <500000>; > > regulator-max-microvolt = <3500000>; > > The min/max should be set to the same value as you can't really change > the voltage levels. > > If you know the voltage level that is supplied for your platform, then > state this value - otherwise I would suggest picking 3.3V, which is > rather commonly used for MMC/SD. Okay. The supplied voltage is 2.7V~3.6V. l'll correct the min/max value to 3.3V: regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; > > }; > > mmc0:mmc@4020000 { > > compatible = "allwinner,sun50i-a100-emmc"; > > device_type = "mmc0"; > > vmmc-supply = <®_dummy_vmmc>; > > } > > In this patch, we print an error message and abort the probe process if > > the regulator is not specified in DTS. > > > > Signed-off-by: Michael Wu <michael@allwinnertech.com> > > --- > > > > diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c > > index 2702736..0da74bd 100644 > > --- a/drivers/mmc/host/sunxi-mmc.c > > +++ b/drivers/mmc/host/sunxi-mmc.c > > @@ -1300,6 +1300,11 @@ > > if (ret) > > return ret; > > > > + if (!host->mmc->ocr_avail) { > > + dev_err(&pdev->dev, "Could not get mmc regulator\n"); > > + return -EINVAL; > > + } > > + > > host->reg_base = devm_platform_ioremap_resource(pdev, 0); > > if (IS_ERR(host->reg_base)) > > return PTR_ERR(host->reg_base); > > > > Best Regards, > > Michael Wu > > Yep, this looks good to me! > > Kind regards > Uffe I'll submit the patch once I get back to work. Thanks for your effort and happy new year :) Best Regards, Michael Wu ^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2021-12-31 14:11 UTC | newest] Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-12-22 3:06 [PATCH 1/3] mmc:sunxi-mmc:add support on discrete device power supply Michael Wu 2021-12-22 3:06 ` Michael Wu 2021-12-28 16:49 ` Ulf Hansson 2021-12-28 16:49 ` Ulf Hansson 2021-12-31 8:27 ` michael 2021-12-31 8:27 ` michael 2021-12-31 12:14 ` Ulf Hansson 2021-12-31 12:14 ` Ulf Hansson 2021-12-31 14:06 ` michael 2021-12-31 14:06 ` michael
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