| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20230613140250.3018947-3-piyush.mehta@amd.com>
Date: Tue, 13 Jun 2023 19:32:50 +0530
From: Piyush Mehta <piyush.mehta@....com>
To: <anurag.kumar.vulisha@...inx.com>,
<laurent.pinchart@...asonboard.com>, <vkoul@...nel.org>,
<kishon@...nel.org>, <michal.simek@....com>
CC: <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
<linux-arm-kernel@...ts.infradead.org>, <git@....com>,
Piyush Mehta <piyush.mehta@....com>
Subject: [PATCH V2 2/2] phy: xilinx: phy-zynqmp: dynamic clock support for power-save
Enabling clock for all the lanes consumes power even PHY is active or
inactive. To resolve this, enable/disable clocks in phy_init/phy_exit.
By default clock is disabled for all the lanes. Whenever phy_init called
from USB, SATA, or display driver, etc. It enabled the required clock
for requested lane. On phy_exit cycle, it disabled clock for the active
PHYs.
During the suspend/resume cycle, each USB/ SATA/ display driver called
phy_exit/phy_init individually. It disabled clock on exit, and enabled
on initialization for the active PHYs.
Signed-off-by: Piyush Mehta <piyush.mehta@....com>
---
drivers/phy/xilinx/phy-zynqmp.c | 61 ++++++++-------------------------
1 file changed, 15 insertions(+), 46 deletions(-)
diff --git a/drivers/phy/xilinx/phy-zynqmp.c b/drivers/phy/xilinx/phy-zynqmp.c
index aada18123c19..b0c2045b886e 100644
--- a/drivers/phy/xilinx/phy-zynqmp.c
+++ b/drivers/phy/xilinx/phy-zynqmp.c
@@ -572,6 +572,10 @@ static int xpsgtr_phy_init(struct phy *phy)
mutex_lock(>r_dev->gtr_mutex);
+ /* Configure and enable the clock when peripheral phy_init call */
+ if (clk_prepare_enable(gtr_dev->clk[gtr_phy->lane]))
+ goto out;
+
/* Skip initialization if not required. */
if (!xpsgtr_phy_init_required(gtr_phy))
goto out;
@@ -616,9 +620,13 @@ static int xpsgtr_phy_init(struct phy *phy)
static int xpsgtr_phy_exit(struct phy *phy)
{
struct xpsgtr_phy *gtr_phy = phy_get_drvdata(phy);
+ struct xpsgtr_dev *gtr_dev = gtr_phy->dev;
gtr_phy->skip_phy_init = false;
+ /* Ensure that disable clock only, which configure for lane */
+ clk_disable_unprepare(gtr_dev->clk[gtr_phy->lane]);
+
return 0;
}
@@ -824,15 +832,11 @@ static struct phy *xpsgtr_xlate(struct device *dev,
static int xpsgtr_runtime_suspend(struct device *dev)
{
struct xpsgtr_dev *gtr_dev = dev_get_drvdata(dev);
- unsigned int i;
/* Save the snapshot ICM_CFG registers. */
gtr_dev->saved_icm_cfg0 = xpsgtr_read(gtr_dev, ICM_CFG0);
gtr_dev->saved_icm_cfg1 = xpsgtr_read(gtr_dev, ICM_CFG1);
- for (i = 0; i < ARRAY_SIZE(gtr_dev->clk); i++)
- clk_disable_unprepare(gtr_dev->clk[i]);
-
return 0;
}
@@ -842,13 +846,6 @@ static int xpsgtr_runtime_resume(struct device *dev)
unsigned int icm_cfg0, icm_cfg1;
unsigned int i;
bool skip_phy_init;
- int err;
-
- for (i = 0; i < ARRAY_SIZE(gtr_dev->clk); i++) {
- err = clk_prepare_enable(gtr_dev->clk[i]);
- if (err)
- goto err_clk_put;
- }
icm_cfg0 = xpsgtr_read(gtr_dev, ICM_CFG0);
icm_cfg1 = xpsgtr_read(gtr_dev, ICM_CFG1);
@@ -869,12 +866,6 @@ static int xpsgtr_runtime_resume(struct device *dev)
gtr_dev->phys[i].skip_phy_init = skip_phy_init;
return 0;
-
-err_clk_put:
- while (i--)
- clk_disable_unprepare(gtr_dev->clk[i]);
-
- return err;
}
static DEFINE_RUNTIME_DEV_PM_OPS(xpsgtr_pm_ops, xpsgtr_runtime_suspend,
@@ -886,7 +877,6 @@ static DEFINE_RUNTIME_DEV_PM_OPS(xpsgtr_pm_ops, xpsgtr_runtime_suspend,
static int xpsgtr_get_ref_clocks(struct xpsgtr_dev *gtr_dev)
{
unsigned int refclk;
- int ret;
for (refclk = 0; refclk < ARRAY_SIZE(gtr_dev->refclk_sscs); ++refclk) {
unsigned long rate;
@@ -897,19 +887,14 @@ static int xpsgtr_get_ref_clocks(struct xpsgtr_dev *gtr_dev)
snprintf(name, sizeof(name), "ref%u", refclk);
clk = devm_clk_get_optional(gtr_dev->dev, name);
if (IS_ERR(clk)) {
- ret = dev_err_probe(gtr_dev->dev, PTR_ERR(clk),
- "Failed to get reference clock %u\n",
- refclk);
- goto err_clk_put;
+ return dev_err_probe(gtr_dev->dev, PTR_ERR(clk),
+ "Failed to get ref clock %u\n",
+ refclk);
}
if (!clk)
continue;
- ret = clk_prepare_enable(clk);
- if (ret)
- goto err_clk_put;
-
gtr_dev->clk[refclk] = clk;
/*
@@ -929,18 +914,11 @@ static int xpsgtr_get_ref_clocks(struct xpsgtr_dev *gtr_dev)
dev_err(gtr_dev->dev,
"Invalid rate %lu for reference clock %u\n",
rate, refclk);
- ret = -EINVAL;
- goto err_clk_put;
+ return -EINVAL;
}
}
return 0;
-
-err_clk_put:
- while (refclk--)
- clk_disable_unprepare(gtr_dev->clk[refclk]);
-
- return ret;
}
static int xpsgtr_probe(struct platform_device *pdev)
@@ -949,7 +927,6 @@ static int xpsgtr_probe(struct platform_device *pdev)
struct xpsgtr_dev *gtr_dev;
struct phy_provider *provider;
unsigned int port;
- unsigned int i;
int ret;
gtr_dev = devm_kzalloc(&pdev->dev, sizeof(*gtr_dev), GFP_KERNEL);
@@ -989,8 +966,7 @@ static int xpsgtr_probe(struct platform_device *pdev)
phy = devm_phy_create(&pdev->dev, np, &xpsgtr_phyops);
if (IS_ERR(phy)) {
dev_err(&pdev->dev, "failed to create PHY\n");
- ret = PTR_ERR(phy);
- goto err_clk_put;
+ return PTR_ERR(phy);
}
gtr_phy->phy = phy;
@@ -1001,8 +977,7 @@ static int xpsgtr_probe(struct platform_device *pdev)
provider = devm_of_phy_provider_register(&pdev->dev, xpsgtr_xlate);
if (IS_ERR(provider)) {
dev_err(&pdev->dev, "registering provider failed\n");
- ret = PTR_ERR(provider);
- goto err_clk_put;
+ return PTR_ERR(provider);
}
pm_runtime_set_active(gtr_dev->dev);
@@ -1011,16 +986,10 @@ static int xpsgtr_probe(struct platform_device *pdev)
ret = pm_runtime_resume_and_get(gtr_dev->dev);
if (ret < 0) {
pm_runtime_disable(gtr_dev->dev);
- goto err_clk_put;
+ return ret;
}
return 0;
-
-err_clk_put:
- for (i = 0; i < ARRAY_SIZE(gtr_dev->clk); i++)
- clk_disable_unprepare(gtr_dev->clk[i]);
-
- return ret;
}
static int xpsgtr_remove(struct platform_device *pdev)
--
2.25.1
Powered by blists - more mailing lists