linux-kernel - [PATCH v7 01/37] soc/tegra: pmc: Temporarily disable PMC state syncing

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Message-Id: <20210701232728.23591-2-digetx@gmail.com>
Date:   Fri,  2 Jul 2021 02:26:52 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: [PATCH v7 01/37] soc/tegra: pmc: Temporarily disable PMC state syncing

Disable PMC state syncing in order to ensure that we won't break older
kernels once device-trees will be updated with the addition of the power
domains. Previously this was unnecessary because the plan was to make clk
device that will attach to the domain for each clock, but the plan changed
and now we're going make a better GENPD implementation that will require
to update each device driver with the runtime PM and OPP support before
we could safely enable the state syncing.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/soc/tegra/pmc.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index ea62f84d1c8b..f63dfb2ca3f9 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -360,6 +360,7 @@ struct tegra_pmc_soc {
 	unsigned int num_pmc_clks;
 	bool has_blink_output;
 	bool has_usb_sleepwalk;
+	bool supports_core_domain;
 };
 
 /**
@@ -3029,6 +3030,7 @@ static void tegra20_pmc_setup_irq_polarity(struct tegra_pmc *pmc,
 }
 
 static const struct tegra_pmc_soc tegra20_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = ARRAY_SIZE(tegra20_powergates),
 	.powergates = tegra20_powergates,
 	.num_cpu_powergates = 0,
@@ -3089,6 +3091,7 @@ static const char * const tegra30_reset_sources[] = {
 };
 
 static const struct tegra_pmc_soc tegra30_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = ARRAY_SIZE(tegra30_powergates),
 	.powergates = tegra30_powergates,
 	.num_cpu_powergates = ARRAY_SIZE(tegra30_cpu_powergates),
@@ -3145,6 +3148,7 @@ static const u8 tegra114_cpu_powergates[] = {
 };
 
 static const struct tegra_pmc_soc tegra114_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = ARRAY_SIZE(tegra114_powergates),
 	.powergates = tegra114_powergates,
 	.num_cpu_powergates = ARRAY_SIZE(tegra114_cpu_powergates),
@@ -3261,6 +3265,7 @@ static const struct pinctrl_pin_desc tegra124_pin_descs[] = {
 };
 
 static const struct tegra_pmc_soc tegra124_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = ARRAY_SIZE(tegra124_powergates),
 	.powergates = tegra124_powergates,
 	.num_cpu_powergates = ARRAY_SIZE(tegra124_cpu_powergates),
@@ -3386,6 +3391,7 @@ static const struct tegra_wake_event tegra210_wake_events[] = {
 };
 
 static const struct tegra_pmc_soc tegra210_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = ARRAY_SIZE(tegra210_powergates),
 	.powergates = tegra210_powergates,
 	.num_cpu_powergates = ARRAY_SIZE(tegra210_cpu_powergates),
@@ -3543,6 +3549,7 @@ static const struct tegra_wake_event tegra186_wake_events[] = {
 };
 
 static const struct tegra_pmc_soc tegra186_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = 0,
 	.powergates = NULL,
 	.num_cpu_powergates = 0,
@@ -3677,6 +3684,7 @@ static const struct tegra_wake_event tegra194_wake_events[] = {
 };
 
 static const struct tegra_pmc_soc tegra194_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = 0,
 	.powergates = NULL,
 	.num_cpu_powergates = 0,
@@ -3745,6 +3753,7 @@ static const char * const tegra234_reset_sources[] = {
 };
 
 static const struct tegra_pmc_soc tegra234_pmc_soc = {
+	.supports_core_domain = false,
 	.num_powergates = 0,
 	.powergates = NULL,
 	.num_cpu_powergates = 0,
@@ -3791,6 +3800,14 @@ static void tegra_pmc_sync_state(struct device *dev)
 {
 	int err;
 
+	/*
+	 * Newer device-trees have power domains, but we need to prepare all
+	 * device drivers with runtime PM and OPP support first, otherwise
+	 * state syncing is unsafe.
+	 */
+	if (!pmc->soc->supports_core_domain)
+		return;
+
 	/*
 	 * Older device-trees don't have core PD, and thus, there are
 	 * no dependencies that will block the state syncing. We shouldn't
-- 
2.30.2