From: Keerthy <j-keerthy@ti.com> To: <vireshk@kernel.org>, <nm@ti.com>, <sboyd@kernel.org> Cc: <linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <d-gerlach@ti.com>, <t-kristo@ti.com>, <j-keerthy@ti.com> Subject: [PATCH 1/2] opp: ti-opp-supply: Dynamically update u_volt_min Date: Wed, 7 Nov 2018 10:04:22 +0530 [thread overview] Message-ID: <1541565263-8296-2-git-send-email-j-keerthy@ti.com> (raw) In-Reply-To: <1541565263-8296-1-git-send-email-j-keerthy@ti.com> The voltage range (min, max) provided in the device tree is from the data manual and is pretty big, catering to a wide range of devices. On a i2c read/write failure the regulator_set_voltage_triplet function falls back to set voltage between min and max. The min value from Device Tree can be lesser than the optimal value and in that case that can lead to a hang or crash. Hence set the u_volt_min dynamically to the optimal voltage value. Fixes: 9a835fa6e47 ("PM / OPP: Add ti-opp-supply driver") Signed-off-by: Keerthy <j-keerthy@ti.com> --- drivers/opp/ti-opp-supply.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/opp/ti-opp-supply.c b/drivers/opp/ti-opp-supply.c index 9e5a9a3..29e08a4 100644 --- a/drivers/opp/ti-opp-supply.c +++ b/drivers/opp/ti-opp-supply.c @@ -290,6 +290,9 @@ static int ti_opp_supply_set_opp(struct dev_pm_set_opp_data *data) vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data, new_supply_vbb->u_volt); + if (new_supply_vdd->u_volt_min < vdd_uv) + new_supply_vdd->u_volt_min = vdd_uv; + /* Scaling up? Scale voltage before frequency */ if (freq > old_freq) { ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg, -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Keerthy <j-keerthy@ti.com> To: vireshk@kernel.org, nm@ti.com, sboyd@kernel.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, d-gerlach@ti.com, t-kristo@ti.com, j-keerthy@ti.com Subject: [PATCH 1/2] opp: ti-opp-supply: Dynamically update u_volt_min Date: Wed, 7 Nov 2018 10:04:22 +0530 [thread overview] Message-ID: <1541565263-8296-2-git-send-email-j-keerthy@ti.com> (raw) In-Reply-To: <1541565263-8296-1-git-send-email-j-keerthy@ti.com> The voltage range (min, max) provided in the device tree is from the data manual and is pretty big, catering to a wide range of devices. On a i2c read/write failure the regulator_set_voltage_triplet function falls back to set voltage between min and max. The min value from Device Tree can be lesser than the optimal value and in that case that can lead to a hang or crash. Hence set the u_volt_min dynamically to the optimal voltage value. Fixes: 9a835fa6e47 ("PM / OPP: Add ti-opp-supply driver") Signed-off-by: Keerthy <j-keerthy@ti.com> --- drivers/opp/ti-opp-supply.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/opp/ti-opp-supply.c b/drivers/opp/ti-opp-supply.c index 9e5a9a3..29e08a4 100644 --- a/drivers/opp/ti-opp-supply.c +++ b/drivers/opp/ti-opp-supply.c @@ -290,6 +290,9 @@ static int ti_opp_supply_set_opp(struct dev_pm_set_opp_data *data) vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data, new_supply_vbb->u_volt); + if (new_supply_vdd->u_volt_min < vdd_uv) + new_supply_vdd->u_volt_min = vdd_uv; + /* Scaling up? Scale voltage before frequency */ if (freq > old_freq) { ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg, -- 1.9.1
next prev parent reply other threads:[~2018-11-07 4:34 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-11-07 4:34 [PATCH 0/2] opp: ti-opp-supply: Fixes Keerthy 2018-11-07 4:34 ` Keerthy 2018-11-07 4:34 ` Keerthy [this message] 2018-11-07 4:34 ` [PATCH 1/2] opp: ti-opp-supply: Dynamically update u_volt_min Keerthy 2018-11-08 5:54 ` Viresh Kumar 2018-11-12 3:15 ` J, KEERTHY 2018-11-12 3:15 ` J, KEERTHY 2018-11-12 22:05 ` Dave Gerlach 2018-11-12 22:05 ` Dave Gerlach 2018-11-07 4:34 ` [PATCH 2/2] opp: ti-opp-supply: Correct the supply in _get_optimal_vdd_voltage call Keerthy 2018-11-07 4:34 ` Keerthy 2018-11-12 21:49 ` Dave Gerlach 2018-11-12 21:49 ` Dave Gerlach 2018-11-08 5:53 ` [PATCH 0/2] opp: ti-opp-supply: Fixes Viresh Kumar 2018-11-13 4:12 ` Viresh Kumar
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