On 05/01/2023 18:07, Markus Schneider-Pargmann wrote:
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 v4:
- Redesigned the patch to be better to understand and have less code
duplication
Changes in v3:
- Separated the way_en functions for clarity
- Added some checks for infracfg_nao
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 | 57 ++++++++++++++++++++-------
drivers/soc/mediatek/mtk-pm-domains.h | 16 ++++++--
2 files changed, 54 insertions(+), 19 deletions(-)
diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 999e1f6c86b0..d53309f050ee 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -43,6 +43,7 @@ struct scpsys_domain {
struct clk_bulk_data *clks;
int num_subsys_clks;
struct clk_bulk_data *subsys_clks;
+ struct regmap *infracfg_nao;
struct regmap *infracfg;
struct regmap *smi;
struct regulator *supply;
@@ -118,10 +119,13 @@ static int scpsys_sram_disable(struct scpsys_domain *pd)
}
static int scpsys_bus_protect_clear(const struct scpsys_bus_prot_data *bpd,
- struct regmap *regmap)
+ struct regmap *regmap,
+ struct regmap *sta_regmap)
I had a look at this and I don't like the idea to add another regmap that's used
based on flag in scpsys_bus_prot_data.
Up to now the assumption was that the different actions to enable/disable bus
protection were done using one regmap. For this reason the regmap was defined
once in scpsys_domain. It's not a good design to just pass more and more regmaps
or other members to the functions. We should try to find a better way to
structure the data so that it fulfills our needs.
Possible solutions I can think of right now:
a) Pass a struct of two regmaps to _scpsys_bus_protect_[disable,enable]()
We can pass the second regmap only if pd->way_en is set, otherwise it will be
ignored anyway.
It's less flexible if in the future we need another regmap. We will have two a
flag to mark we use way_en twice, in struct scpsys_domain and in struct
scpsys_domain_data. Please see my comment below. It's something else to think about.
b) Add a flag field to scpsys_bus_prot_data to say explicitely if we want to use
infracfg, smi with/without way_en. Then we can pass all three regmaps in a
struct, it will be easy to add new regmaps in the future.
Downsides:
1) We will overload even more the _BUS_PROT macros, which get's hard to read and
understand already. Maybe that can somehow be fixed. An idea would be by adding
a bit field to scpsys_bus_prot_data.
2) We will need to rework all the scpsys_domain_data structures for all SoCs
already supported. It's doable, but it's some extra work.
Any other ideas?
{
u32 val;
u32 sta_mask = bpd->bus_prot_sta_mask;
+ /* way_en acknowledges successful clear with the bit being set */
+ u32 expected_ack = (bpd->way_en ? sta_mask : 0);
if (bpd->bus_prot_reg_update)
regmap_clear_bits(regmap, bpd->bus_prot_clr, bpd->bus_prot_set_clr_mask);
@@ -131,13 +135,14 @@ static int scpsys_bus_protect_clear(const struct scpsys_bus_prot_data *bpd,
if (bpd->ignore_clr_ack)
return 0;
- return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta,
- val, !(val & sta_mask),
+ return regmap_read_poll_timeout(sta_regmap, bpd->bus_prot_sta,
+ val, (val & sta_mask) == expected_ack,
MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
}
static int scpsys_bus_protect_set(const struct scpsys_bus_prot_data *bpd,
- struct regmap *regmap)
+ struct regmap *regmap,
+ struct regmap *sta_regmap)
{
u32 val;
u32 sta_mask = bpd->bus_prot_sta_mask;
@@ -147,12 +152,13 @@ static int scpsys_bus_protect_set(const struct scpsys_bus_prot_data *bpd,
else
regmap_write(regmap, bpd->bus_prot_set, bpd->bus_prot_set_clr_mask);
- return regmap_read_poll_timeout(regmap, bpd->bus_prot_sta,
+ return regmap_read_poll_timeout(sta_regmap, bpd->bus_prot_sta,
val, (val & sta_mask) == sta_mask,
MTK_POLL_DELAY_US, 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;
@@ -160,9 +166,14 @@ static int _scpsys_bus_protect_enable(const struct scpsys_bus_prot_data *bpd, st
if (!bpd[i].bus_prot_set_clr_mask)
break;
- ret = scpsys_bus_protect_set(&bpd[i], regmap);
- if (ret)
+ if (bpd[i].way_en)
+ ret = scpsys_bus_protect_clear(&bpd[i], regmap, infracfg_nao);
+ else
+ ret = scpsys_bus_protect_set(&bpd[i], regmap, regmap);
+ if (ret) {
+ pr_err("%s %d %d\n", __PRETTY_FUNCTION__, __LINE__, ret);
return ret;
+ }
}
return 0;
@@ -172,15 +183,17 @@ 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);
}
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;
@@ -188,9 +201,14 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
if (!bpd[i].bus_prot_set_clr_mask)
continue;
- ret = scpsys_bus_protect_clear(&bpd[i], regmap);
- if (ret)
+ if (bpd[i].way_en)
+ ret = scpsys_bus_protect_set(&bpd[i], regmap, infracfg_nao);
+ else
+ ret = scpsys_bus_protect_clear(&bpd[i], regmap, regmap);
+ if (ret) {
+ pr_err("%s %d %d\n", __PRETTY_FUNCTION__, __LINE__, ret);
return ret;
+ }
}
return 0;
@@ -200,11 +218,12 @@ 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)
@@ -378,6 +397,14 @@ 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(node, "mediatek,infracfg-nao");
+ if (IS_ERR(pd->infracfg_nao)) {
+ if (MTK_SCPD_CAPS(pd, MTK_SCPD_HAS_WAY_EN))
+ return ERR_CAST(pd->infracfg_nao);
I don't like the fact that we have a caps to show we have WAY_EN and then we
have a bool in scpsys_bus_prot_data to flag when we need to use the second
regmap and the expected_ack mask.
Can't we just make the lookup optional and let it all blow up if DTS is wrong
because no infracfg-nao was defined while there is at least one domain using way_en?
Regards,
Matthias
+
+ 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 34642a279213..1fa634509db1 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.h
+++ b/drivers/soc/mediatek/mtk-pm-domains.h
@@ -10,6 +10,7 @@
#define MTK_SCPD_DOMAIN_SUPPLY BIT(4)
/* can't set MTK_SCPD_KEEP_DEFAULT_OFF at the same time */
#define MTK_SCPD_ALWAYS_ON BIT(5)
+#define MTK_SCPD_HAS_WAY_EN BIT(6)
#define MTK_SCPD_CAPS(_scpd, _x) ((_scpd)->data->caps & (_x))
#define SPM_VDE_PWR_CON 0x0210
@@ -41,7 +42,7 @@
#define SPM_MAX_BUS_PROT_DATA 6
-#define _BUS_PROT(_set_clr_mask, _set, _clr, _sta_mask, _sta, _update, _ignore) { \
+#define _BUS_PROT(_set_clr_mask, _set, _clr, _sta_mask, _sta, _update, _ignore, _way_en) { \
.bus_prot_set_clr_mask = (_set_clr_mask), \
.bus_prot_set = _set, \
.bus_prot_clr = _clr, \
@@ -49,16 +50,20 @@
.bus_prot_sta = _sta, \
.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, _mask, _sta, false, false)
+ _BUS_PROT(_mask, _set, _clr, _mask, _sta, false, false, false)
#define BUS_PROT_WR_IGN(_mask, _set, _clr, _sta) \
- _BUS_PROT(_mask, _set, _clr, _mask, _sta, false, true)
+ _BUS_PROT(_mask, _set, _clr, _mask, _sta, false, true, false)
#define BUS_PROT_UPDATE(_mask, _set, _clr, _sta) \
- _BUS_PROT(_mask, _set, _clr, _mask, _sta, true, false)
+ _BUS_PROT(_mask, _set, _clr, _mask, _sta, true, false, false)
+
+#define BUS_PROT_WAY_EN(_set_mask, _set, _sta_mask, _sta) \
+ _BUS_PROT(_set_mask, _set, _set, _sta_mask, _sta, true, false, true)
#define BUS_PROT_UPDATE_TOPAXI(_mask) \
BUS_PROT_UPDATE(_mask, \
@@ -77,6 +82,8 @@
* write the whole register.
* @ignore_clk_ack: Ignore the result in the status register for clear
* operations.
+ * @way_en: Enable a way in the SoC. For this type the status bit to acknowledge
+ * the change is always 1 on successful change.
*/
struct scpsys_bus_prot_data {
u32 bus_prot_set_clr_mask;
@@ -86,6 +93,7 @@ struct scpsys_bus_prot_data {
u32 bus_prot_sta;
bool bus_prot_reg_update;
bool ignore_clr_ack;
+ bool way_en;
};
/**
