Re: [PATCH v2 2/4] soc: mediatek: Add support of WAY_EN operations
From: AngeloGioacchino Del Regno
Date: Mon Jul 25 2022 - 05:55:37 EST
Il 25/07/22 10:18, Markus Schneider-Pargmann ha scritto:
From: Alexandre Bailon <abailon@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Fabien Parent <fparent@xxxxxxxxxxxx>
Signed-off-by: Markus Schneider-Pargmann <msp@xxxxxxxxxxxx>
---
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;
};
/**