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| author | Alexandre Bailon <abailon@baylibre.com> | 2023-09-18 11:37:51 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-10-17 11:41:42 +0200 |
| commit | d2567a84520d10b8418cc3b53454e4b6aadaf728 (patch) | |
| tree | 4f798f6afed20243e33b9e1390633d29ed56ebab /drivers/pmdomain/mediatek/mtk-pm-domains.c | |
| parent | ecaf11aaee98d3f79f195b73c5efc7065ef00072 (diff) | |
| download | linux-d2567a84520d10b8418cc3b53454e4b6aadaf728.tar.gz linux-d2567a84520d10b8418cc3b53454e4b6aadaf728.tar.bz2 linux-d2567a84520d10b8418cc3b53454e4b6aadaf728.zip | |
pmdomain: mediatek: Add support for MTK_SCPD_STRICT_BUS_PROTECTION cap
This adds support for MTK_SCPD_STRICT_BUS_PROTECTION capability. It is a
strict bus protection policy that requires the bus protection to be
disabled before accessing the bus.
This 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>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Tested-by: Alexandre Mergnat <amergnat@baylibre.com>
Link: https://lore.kernel.org/r/20230918093751.1188668-8-msp@baylibre.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/pmdomain/mediatek/mtk-pm-domains.c')
| -rw-r--r-- | drivers/pmdomain/mediatek/mtk-pm-domains.c | 27 |
1 files changed, 23 insertions, 4 deletions
diff --git a/drivers/pmdomain/mediatek/mtk-pm-domains.c b/drivers/pmdomain/mediatek/mtk-pm-domains.c index 4bf3a375b749..69cdf6ff00b8 100644 --- a/drivers/pmdomain/mediatek/mtk-pm-domains.c +++ b/drivers/pmdomain/mediatek/mtk-pm-domains.c @@ -262,9 +262,17 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) regmap_clear_bits(scpsys->base, pd->data->ctl_offs, PWR_ISO_BIT); regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_RST_B_BIT); - ret = clk_bulk_prepare_enable(pd->num_subsys_clks, pd->subsys_clks); - if (ret) - goto err_pwr_ack; + /* + * In few Mediatek platforms(e.g. MT6779), the bus protect policy is + * stricter, which leads to bus protect release must be prior to bus + * access. + */ + if (!MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION)) { + ret = clk_bulk_prepare_enable(pd->num_subsys_clks, + pd->subsys_clks); + if (ret) + goto err_pwr_ack; + } ret = scpsys_sram_enable(pd); if (ret < 0) @@ -274,12 +282,23 @@ static int scpsys_power_on(struct generic_pm_domain *genpd) if (ret < 0) goto err_disable_sram; + if (MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION)) { + ret = clk_bulk_prepare_enable(pd->num_subsys_clks, + pd->subsys_clks); + if (ret) + goto err_enable_bus_protect; + } + return 0; +err_enable_bus_protect: + scpsys_bus_protect_enable(pd); err_disable_sram: scpsys_sram_disable(pd); err_disable_subsys_clks: - clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks); + if (!MTK_SCPD_CAPS(pd, MTK_SCPD_STRICT_BUS_PROTECTION)) + clk_bulk_disable_unprepare(pd->num_subsys_clks, + pd->subsys_clks); err_pwr_ack: clk_bulk_disable_unprepare(pd->num_clks, pd->clks); err_reg: |