Messages in this thread Patch in this message | | | Date | Mon, 25 Jul 2022 11:55:27 +0200 | Subject | Re: [PATCH v2 2/4] soc: mediatek: Add support of WAY_EN operations | From | AngeloGioacchino Del Regno <> |
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Il 25/07/22 10:18, Markus Schneider-Pargmann ha scritto: > From: Alexandre Bailon <abailon@baylibre.com> > > This updates the power domain to support WAY_EN operations. These > operations enable a path between different units of the chip and are > labeled as 'way_en' in the register descriptions. > > This operation is required by the mt8365 for the MM power domain. > > Signed-off-by: Alexandre Bailon <abailon@baylibre.com> > Signed-off-by: Fabien Parent <fparent@baylibre.com> > Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com> > --- > > Notes: > Changes in v2: > - some minor style fixes. > - Renamed 'wayen' to 'way_en' to clarify the meaning > - Updated commit message > > drivers/soc/mediatek/mtk-pm-domains.c | 64 +++++++++++++++++++++------ > drivers/soc/mediatek/mtk-pm-domains.h | 28 +++++++----- > 2 files changed, 68 insertions(+), 24 deletions(-) > > diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c > index 5ced254b082b..d0eae2227813 100644 > --- a/drivers/soc/mediatek/mtk-pm-domains.c > +++ b/drivers/soc/mediatek/mtk-pm-domains.c > @@ -44,6 +44,7 @@ struct scpsys_domain { > struct clk_bulk_data *subsys_clks; > struct regmap *infracfg; > struct regmap *smi; > + struct regmap *infracfg_nao;
What does "nao" mean?
Besides, please move that before *infracfg to at least keep the same type members alphabetically sorted..
> struct regulator *supply; > }; > > @@ -116,23 +117,38 @@ static int scpsys_sram_disable(struct scpsys_domain *pd) > MTK_POLL_TIMEOUT); > } > > -static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, struct regmap *regmap) > +static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, > + struct regmap *regmap, struct regmap *infracfg_nao) > { > int i, ret; > > for (i = 0; i < SPM_MAX_BUS_PROT_DATA; i++) { > - u32 val, mask = bpd[i].bus_prot_mask; > + u32 mask = bpd[i].bus_prot_mask; > + u32 val = mask, sta_mask = mask;
You have modified the macros to use sta_mask as mask, so, why are you doing that distinction in here between the two? You can simply keep assigning
u32 mask = bpd[1].bus_prot_mask; u32 sta_mask = bpd[1].bus_prot_sta_mask;
> + struct regmap *ack_regmap = regmap;
Double assignment. You're reassigning this if way_en == true.
> > if (!mask) > break; > > + if (bpd[i].way_en) { > + if (!infracfg_nao) > + return -ENODEV; > + > + val = 0; > + sta_mask = bpd[i].bus_prot_sta_mask; > + ack_regmap = infracfg_nao; > + }
if (bpd[i].way_en) { ack_regmap = regmap_nao; val = 0; } else { ack_regmap = regmap; val = mask; }
> + > if (bpd[i].bus_prot_reg_update) > - regmap_set_bits(regmap, bpd[i].bus_prot_set, mask); > + regmap_update_bits(regmap, bpd[i].bus_prot_set, mask, val); > else > regmap_write(regmap, bpd[i].bus_prot_set, mask); > > - ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta, > - val, (val & mask) == mask, > + if (bpd[i].ignore_clr_ack) > + continue;
You're adding that ignore_clr_ack here in the bus prot enablement function which wasn't here before... and I didn't check carefully, but I think that this is wrong: as the name says, it's to "ignore CLEAR ack", we're not doing any clearing here, we're not in bus_protect_disable.
If you're really sure that this is not a mistake, you should guard it for way_en.
> + > + ret = regmap_read_poll_timeout(ack_regmap, bpd[i].bus_prot_sta, > + val, (val & sta_mask) == sta_mask, > MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); > if (ret) > return ret; > @@ -145,34 +161,49 @@ static int scpsys_bus_protect_enable(struct scpsys_domain *pd) > { > int ret; > > - ret = _scpsys_bus_protect_enable(pd->data->bp_infracfg, pd->infracfg); > + ret = _scpsys_bus_protect_enable(pd->data->bp_infracfg, > + pd->infracfg, pd->infracfg_nao); > if (ret) > return ret; > > - return _scpsys_bus_protect_enable(pd->data->bp_smi, pd->smi); > + return _scpsys_bus_protect_enable(pd->data->bp_smi, pd->smi, NULL); > } > > +#define mask_cond(way_en, val, mask) \ > + ((way_en && ((val & mask) == mask)) || (!way_en && !(val & mask))) > + > static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd, > - struct regmap *regmap) > + struct regmap *regmap, struct regmap *infracfg_nao) > { > int i, ret; > > for (i = SPM_MAX_BUS_PROT_DATA - 1; i >= 0; i--) { > - u32 val, mask = bpd[i].bus_prot_mask; > + u32 val = 0, mask = bpd[i].bus_prot_mask; > + u32 sta_mask = mask; > + struct regmap *ack_regmap = regmap; > > if (!mask) > continue; > > + if (bpd[i].way_en) { > + if (!infracfg_nao) > + return -ENODEV; > + > + val = mask; > + sta_mask = bpd[i].bus_prot_sta_mask; > + ack_regmap = infracfg_nao; > + } > + > if (bpd[i].bus_prot_reg_update) > - regmap_clear_bits(regmap, bpd[i].bus_prot_clr, mask); > + regmap_update_bits(regmap, bpd[i].bus_prot_clr, mask, val); > else > regmap_write(regmap, bpd[i].bus_prot_clr, mask); > > if (bpd[i].ignore_clr_ack) > continue; > > - ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta, > - val, !(val & mask), > + ret = regmap_read_poll_timeout(ack_regmap, bpd[i].bus_prot_sta, > + val, mask_cond(bpd[i].way_en, val, sta_mask),
"I don't know why", my brain still keeps telling me that using different functions for the WAY_EN (en/dis) is just better.
This commit seems to be overcomplicating two "easy" en/dis functions.
> MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT); > if (ret) > return ret; > @@ -185,11 +216,12 @@ static int scpsys_bus_protect_disable(struct scpsys_domain *pd) > { > int ret; > > - ret = _scpsys_bus_protect_disable(pd->data->bp_smi, pd->smi); > + ret = _scpsys_bus_protect_disable(pd->data->bp_smi, pd->smi, NULL); > if (ret) > return ret; > > - return _scpsys_bus_protect_disable(pd->data->bp_infracfg, pd->infracfg); > + return _scpsys_bus_protect_disable(pd->data->bp_infracfg, > + pd->infracfg, pd->infracfg_nao); > } > > static int scpsys_regulator_enable(struct regulator *supply) > @@ -363,6 +395,10 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no > return ERR_CAST(pd->smi); > } > > + pd->infracfg_nao = syscon_regmap_lookup_by_phandle_optional(node, "mediatek,infracfg_nao"); > + if (IS_ERR(pd->infracfg_nao)) > + return ERR_CAST(pd->infracfg_nao); > +
I think that we should enforce a check here:
pd->infracfg_nao = syscon_regmap_lookup_by_phandle(node, "mediatek,infracfg_nao"); if (IS_ERR(pd->infracfg_nao)) { /* checking if infracfg_nao != NULL at every pwoeron/poweroff is largely * suboptimal, as if it't present once, it's present always (!) */ if (we have WAY_EN) return ERR_CAST ... pd->infracfg_nao = NULL; }
> num_clks = of_clk_get_parent_count(node); > if (num_clks > 0) { > /* Calculate number of subsys_clks */ > diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h > index daa24e890dd4..e788d6bdde9d 100644 > --- a/drivers/soc/mediatek/mtk-pm-domains.h > +++ b/drivers/soc/mediatek/mtk-pm-domains.h > @@ -39,23 +39,29 @@ > > #define SPM_MAX_BUS_PROT_DATA 6 > > -#define _BUS_PROT(_mask, _set, _clr, _sta, _update, _ignore) { \ > - .bus_prot_mask = (_mask), \ > - .bus_prot_set = _set, \ > - .bus_prot_clr = _clr, \ > - .bus_prot_sta = _sta, \ > - .bus_prot_reg_update = _update, \ > - .ignore_clr_ack = _ignore, \ > +#define _BUS_PROT(_mask, _sta_mask, _set, _clr, _sta, _update, _ignore, _way_en) { \ > + .bus_prot_mask = (_mask), \ > + .bus_prot_set = _set, \ > + .bus_prot_clr = _clr, \ > + .bus_prot_sta = _sta, \ > + .bus_prot_sta_mask = _sta_mask, \ > + .bus_prot_reg_update = _update, \ > + .ignore_clr_ack = _ignore, \ > + .way_en = _way_en, \ > } > > #define BUS_PROT_WR(_mask, _set, _clr, _sta) \ > - _BUS_PROT(_mask, _set, _clr, _sta, false, false) > + _BUS_PROT(_mask, _mask, _set, _clr, _sta, false, false, false) > > #define BUS_PROT_WR_IGN(_mask, _set, _clr, _sta) \ > - _BUS_PROT(_mask, _set, _clr, _sta, false, true) > + _BUS_PROT(_mask, _mask, _set, _clr, _sta, false, true, false) > > #define BUS_PROT_UPDATE(_mask, _set, _clr, _sta) \ > - _BUS_PROT(_mask, _set, _clr, _sta, true, false) > + _BUS_PROT(_mask, _mask, _set, _clr, _sta, true, false, false) > + > +#define BUS_PROT_WAY_EN(_en_mask, _sta_mask, _set, _sta) \ > + _BUS_PROT(_en_mask, _sta_mask, _set, _set, _sta, true, false, \ > + true) > > #define BUS_PROT_UPDATE_TOPAXI(_mask) \ > BUS_PROT_UPDATE(_mask, \ > @@ -68,8 +74,10 @@ struct scpsys_bus_prot_data { > u32 bus_prot_set; > u32 bus_prot_clr; > u32 bus_prot_sta; > + u32 bus_prot_sta_mask; > bool bus_prot_reg_update; > bool ignore_clr_ack; > + bool way_en; > }; > > /**
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