| Message ID | 20250417124645.24456-3-quic_nitirawa@quicinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support to disable UFS LPM | expand |
On 4/17/2025 6:16 PM, Nitin Rawat wrote: [...] > +/** > + * ufshcd_parse_lpm_support - read from DT whether LPM modes should be disabled. > + * @hba: host controller instance > + */ > +static void ufshcd_parse_lpm_support(struct ufs_hba *hba) > +{ > + struct device *dev = hba->dev; > + > + hba->disable_lpm = of_property_read_bool(dev->of_node, "disable-lpm"); > + if (hba->disable_lpm) > + dev_info(hba->dev, "UFS LPM is disabled\n"); How about keeping as debug ? > +} > + [...] > -- > 2.48.1 > >
diff --git a/drivers/ufs/host/ufshcd-pltfrm.c b/drivers/ufs/host/ufshcd-pltfrm.c index ffe5d1d2b215..764525d9262b 100644 --- a/drivers/ufs/host/ufshcd-pltfrm.c +++ b/drivers/ufs/host/ufshcd-pltfrm.c @@ -210,6 +210,19 @@ static void ufshcd_init_lanes_per_dir(struct ufs_hba *hba) } } +/** + * ufshcd_parse_lpm_support - read from DT whether LPM modes should be disabled. + * @hba: host controller instance + */ +static void ufshcd_parse_lpm_support(struct ufs_hba *hba) +{ + struct device *dev = hba->dev; + + hba->disable_lpm = of_property_read_bool(dev->of_node, "disable-lpm"); + if (hba->disable_lpm) + dev_info(hba->dev, "UFS LPM is disabled\n"); +} + /** * ufshcd_parse_clock_min_max_freq - Parse MIN and MAX clocks freq * @hba: per adapter instance @@ -495,6 +508,8 @@ int ufshcd_pltfrm_init(struct platform_device *pdev, ufshcd_init_lanes_per_dir(hba); + ufshcd_parse_lpm_support(hba); + err = ufshcd_parse_operating_points(hba); if (err) { dev_err(dev, "%s: OPP parse failed %d\n", __func__, err); diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index e928ed0265ff..5a3daed1f086 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -1143,6 +1143,7 @@ struct ufs_hba { int critical_health_count; atomic_t dev_lvl_exception_count; u64 dev_lvl_exception_id; + bool disable_lpm; }; /**
There are emulation FPGA platforms or other platforms where UFS low power mode is either unsupported or power efficiency is not a critical requirement. Add support for parsing disable LPM property from device tree . The disable lpm support in devicetree is added through the "disable-lpm" property for such platforms. Disabling LPM ensure stable operation and compatibility with these environments, where power management features might interfere with performance or functionality. Signed-off-by: Nitin Rawat <quic_nitirawa@quicinc.com> --- drivers/ufs/host/ufshcd-pltfrm.c | 15 +++++++++++++++ include/ufs/ufshcd.h | 1 + 2 files changed, 16 insertions(+) -- 2.48.1