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[104.57.184.186]) by smtp.gmail.com with ESMTPSA id o6sm1057170oib.3.2021.07.02.17.55.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Jul 2021 17:55:36 -0700 (PDT) From: Bjorn Andersson To: Andy Gross , Bjorn Andersson , Ulf Hansson , Stephen Boyd , Rajendra Nayak , Dmitry Baryshkov Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] soc: qcom: rpmhpd: Make power_on actually enable the domain Date: Fri, 2 Jul 2021 17:54:16 -0700 Message-Id: <20210703005416.2668319-3-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210703005416.2668319-1-bjorn.andersson@linaro.org> References: <20210703005416.2668319-1-bjorn.andersson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The general expectation is that powering on a power-domain should make the power domain deliver some power, and if a specific performace state is needed further requests has to be made. But in contrast with other power-domain implementations (e.g. rpmpd) the RPMh does not have an interface to enable the power, so the driver has to vote for a particular corner (performance level) in rpmh_power_on(). But the corner is never initialized, so a typical request to simply enable the power domain would not actually turn on the hardware. Further more, when no more clients vote for a performance state (i.e. the aggregated vote is 0) the power domain would be turn off. Fix both of these issues by always voting for a corner with non-zero value, when the power domain is enabled. The tracking of the lowest non-zero corner is performed to handle the corner case if there's ever a domain with a non-zero lowest corner, in which case both rpmh_power_on() and rpmh_rpmhpd_set_performance_state() would be allowed to use this lowest corner. Fixes: 279b7e8a62cc ("soc: qcom: rpmhpd: Add RPMh power domain driver") Signed-off-by: Bjorn Andersson --- drivers/soc/qcom/rpmhpd.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/soc/qcom/rpmhpd.c b/drivers/soc/qcom/rpmhpd.c index fa209b479ab3..29a339942301 100644 --- a/drivers/soc/qcom/rpmhpd.c +++ b/drivers/soc/qcom/rpmhpd.c @@ -30,6 +30,7 @@ * @active_only: True if it represents an Active only peer * @corner: current corner * @active_corner: current active corner + * @enable_corner: lowest non-zero corner * @level: An array of level (vlvl) to corner (hlvl) mappings * derived from cmd-db * @level_count: Number of levels supported by the power domain. max @@ -47,6 +48,7 @@ struct rpmhpd { const bool active_only; unsigned int corner; unsigned int active_corner; + unsigned int enable_corner; u32 level[RPMH_ARC_MAX_LEVELS]; size_t level_count; bool enabled; @@ -385,13 +387,13 @@ static int rpmhpd_aggregate_corner(struct rpmhpd *pd, unsigned int corner) static int rpmhpd_power_on(struct generic_pm_domain *domain) { struct rpmhpd *pd = domain_to_rpmhpd(domain); - int ret = 0; + unsigned int corner; + int ret; mutex_lock(&rpmhpd_lock); - if (pd->corner) - ret = rpmhpd_aggregate_corner(pd, pd->corner); - + corner = max(pd->corner, pd->enable_corner); + ret = rpmhpd_aggregate_corner(pd, corner); if (!ret) pd->enabled = true; @@ -472,6 +474,10 @@ static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd) for (i = 0; i < rpmhpd->level_count; i++) { rpmhpd->level[i] = buf[i]; + /* Remember the first non-zero corner */ + if (!rpmhpd->enable_corner) + rpmhpd->enable_corner = i; + /* * The AUX data may be zero padded. These 0 valued entries at * the end of the map must be ignored. -- 2.29.2