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authorShawn Guo <shawn.guo@freescale.com>2014-05-28 19:05:39 +0400
committerTejun Heo <tj@kernel.org>2014-06-19 18:14:58 +0400
commite6dd42a917e62d916c6e513dbf87a4dec8cf3a1c (patch)
treea520dff64c52c0dea954afcce936b29398ccb3ca /drivers/ata
parentacbd573354bb7b7b7a3891018a39f4b3976b0c43 (diff)
downloadlinux-e6dd42a917e62d916c6e513dbf87a4dec8cf3a1c.tar.xz
ahci: imx: manage only sata_ref_clk in imx_sata_enable[disable]
Doing suspend/resume on imx6q and imx53 boards with no SATA disk attached will trigger the following warning. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 661 at drivers/ata/libahci.c:224 ahci_enable_ahci+0x74/0x8) Modules linked in: CPU: 0 PID: 661 Comm: sh Tainted: G W 3.15.0-rc5-next-20140521-000027 Backtrace: [<80011c90>] (dump_backtrace) from [<80011e2c>] (show_stack+0x18/0x1c) r6:803a22f4 r5:00000000 r4:00000000 r3:00000000 [<80011e14>] (show_stack) from [<80661e60>] (dump_stack+0x88/0xa4) [<80661dd8>] (dump_stack) from [<80028fdc>] (warn_slowpath_common+0x70/0x94) r5:00000009 r4:00000000 [<80028f6c>] (warn_slowpath_common) from [<80029024>] (warn_slowpath_null+0x24/) r8:808f68c4 r7:00000000 r6:00000000 r5:00000000 r4:e0810004 [<80029000>] (warn_slowpath_null) from [<803a22f4>] (ahci_enable_ahci+0x74/0x80) [<803a2280>] (ahci_enable_ahci) from [<803a2324>] (ahci_reset_controller+0x24/0) r8:ddcd9410 r7:80351178 r6:ddcd9444 r5:dde8b850 r4:e0810000 r3:ddf35e90 [<803a2300>] (ahci_reset_controller) from [<803a2c68>] (ahci_platform_resume_ho) r7:80351178 r6:ddcd9444 r5:dde8b850 r4:ddcd9410 [<803a2c30>] (ahci_platform_resume_host) from [<803a38f0>] (imx_ahci_resume+0x2) r5:00000000 r4:ddcd9410 [<803a38c4>] (imx_ahci_resume) from [<803511ac>] (platform_pm_resume+0x34/0x54) .... The reason is that the SATA controller has no working clock at this point, and thus ahci_enable_ahci() fails to enable the controller. In case that there is no SATA disk attached, the imx_sata_disable() gets called in ahci_imx_error_handler(), and both sata_clk and sata_ref_clk will be disabled there. Because all the imx_sata_enable() calls afterward will return immediately due to imxpriv->no_device check, the SATA controller working clock sata_clk will never get any chance to be enabled again. This is a regression caused by commit 90870d79d4f2 (ahci-imx: Port to library-ised ahci_platform). Before the commit, only sata_ref_clk is managed by the driver in enable/disable function. But after the commit, all the clocks are enabled/disabled in a row by ahci platform helpers ahci_platform_enable[disable]_clks. Since ahb_clk is a bus clock which does not have gate at all, and i.MX low-power hardware module already manages sata_clk across suspend/resume cycle, the only clock that needs to be managed by software is sata_ref_clk. So instead of using ahci_platform_enable[disable]_clks to manage all the clocks in a row from imx_sata_enable[disable], we should manage only sata_ref_clk in there. Reported-by: Fabio Estevam <fabio.estevam@freescale.com> Fixes: 90870d79d4f2 (ahci-imx: Port to library-ised ahci_platform) Signed-off-by: Shawn Guo <shawn.guo@freescale.com> Acked-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/ahci_imx.c35
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
index 3a901520c62b..4384a7d72133 100644
--- a/drivers/ata/ahci_imx.c
+++ b/drivers/ata/ahci_imx.c
@@ -58,6 +58,8 @@ enum ahci_imx_type {
struct imx_ahci_priv {
struct platform_device *ahci_pdev;
enum ahci_imx_type type;
+ struct clk *sata_clk;
+ struct clk *sata_ref_clk;
struct clk *ahb_clk;
struct regmap *gpr;
bool no_device;
@@ -224,7 +226,7 @@ static int imx_sata_enable(struct ahci_host_priv *hpriv)
return ret;
}
- ret = ahci_platform_enable_clks(hpriv);
+ ret = clk_prepare_enable(imxpriv->sata_ref_clk);
if (ret < 0)
goto disable_regulator;
@@ -291,7 +293,7 @@ static void imx_sata_disable(struct ahci_host_priv *hpriv)
!IMX6Q_GPR13_SATA_MPLL_CLK_EN);
}
- ahci_platform_disable_clks(hpriv);
+ clk_disable_unprepare(imxpriv->sata_ref_clk);
if (hpriv->target_pwr)
regulator_disable(hpriv->target_pwr);
@@ -385,6 +387,19 @@ static int imx_ahci_probe(struct platform_device *pdev)
imxpriv->no_device = false;
imxpriv->first_time = true;
imxpriv->type = (enum ahci_imx_type)of_id->data;
+
+ imxpriv->sata_clk = devm_clk_get(dev, "sata");
+ if (IS_ERR(imxpriv->sata_clk)) {
+ dev_err(dev, "can't get sata clock.\n");
+ return PTR_ERR(imxpriv->sata_clk);
+ }
+
+ imxpriv->sata_ref_clk = devm_clk_get(dev, "sata_ref");
+ if (IS_ERR(imxpriv->sata_ref_clk)) {
+ dev_err(dev, "can't get sata_ref clock.\n");
+ return PTR_ERR(imxpriv->sata_ref_clk);
+ }
+
imxpriv->ahb_clk = devm_clk_get(dev, "ahb");
if (IS_ERR(imxpriv->ahb_clk)) {
dev_err(dev, "can't get ahb clock.\n");
@@ -407,10 +422,14 @@ static int imx_ahci_probe(struct platform_device *pdev)
hpriv->plat_data = imxpriv;
- ret = imx_sata_enable(hpriv);
+ ret = clk_prepare_enable(imxpriv->sata_clk);
if (ret)
return ret;
+ ret = imx_sata_enable(hpriv);
+ if (ret)
+ goto disable_clk;
+
/*
* Configure the HWINIT bits of the HOST_CAP and HOST_PORTS_IMPL,
* and IP vendor specific register IMX_TIMER1MS.
@@ -435,16 +454,24 @@ static int imx_ahci_probe(struct platform_device *pdev)
ret = ahci_platform_init_host(pdev, hpriv, &ahci_imx_port_info,
0, 0, 0);
if (ret)
- imx_sata_disable(hpriv);
+ goto disable_sata;
+
+ return 0;
+disable_sata:
+ imx_sata_disable(hpriv);
+disable_clk:
+ clk_disable_unprepare(imxpriv->sata_clk);
return ret;
}
static void ahci_imx_host_stop(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
+ struct imx_ahci_priv *imxpriv = hpriv->plat_data;
imx_sata_disable(hpriv);
+ clk_disable_unprepare(imxpriv->sata_clk);
}
#ifdef CONFIG_PM_SLEEP