| Message ID | 20210126211859.790892-1-thara.gopinath@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] dma: qcom: bam_dma: Manage clocks when controlled_remotely is set | expand |
On Tue, Jan 26, 2021 at 04:18:59PM -0500, Thara Gopinath wrote: > When bam dma is "controlled remotely", thus far clocks were not controlled > from the Linux. In this scenario, Linux was disabling runtime pm in bam dma > driver and not doing any clock management in suspend/resume hooks. > > With introduction of crypto engine bam dma, the clock is a rpmh resource > that can be controlled from both Linux and TZ/remote side. Now bam dma > clock is getting enabled during probe even though the bam dma can be > "controlled remotely". But due to clocks not being handled properly, > bam_suspend generates a unbalanced clk_unprepare warning during system > suspend. > > To fix the above issue and to enable proper clock-management, this patch > enables runtim-pm and handles bam dma clocks in suspend/resume hooks if > the clock node is present irrespective of controlled_remotely property. > > Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> Reviewed-by: Shawn Guo <shawn.guo@linaro.org>
On Tue 26 Jan 15:18 CST 2021, Thara Gopinath wrote: > When bam dma is "controlled remotely", thus far clocks were not controlled > from the Linux. In this scenario, Linux was disabling runtime pm in bam dma > driver and not doing any clock management in suspend/resume hooks. > > With introduction of crypto engine bam dma, the clock is a rpmh resource > that can be controlled from both Linux and TZ/remote side. Now bam dma > clock is getting enabled during probe even though the bam dma can be > "controlled remotely". But due to clocks not being handled properly, > bam_suspend generates a unbalanced clk_unprepare warning during system > suspend. > > To fix the above issue and to enable proper clock-management, this patch > enables runtim-pm and handles bam dma clocks in suspend/resume hooks if > the clock node is present irrespective of controlled_remotely property. > > Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> And from John on IRC: Tested-by: John Stultz <john.stultz@linaro.org> Regards, Bjorn > --- > > v1->v2: > - As per Shawn's suggestion, use devm_clk_get_optional to get the > bam clock if the "controlled_remotely" property is set so that > the clock code takes care of setting the bam clock to NULL if > not specified by dt. > - Remove the check for "controlled_remotely" property in > bam_dma_resume now that clock enable / disable is based on > whether bamclk is NULL or not. > - Rebased to v5.11-rc5 > > drivers/dma/qcom/bam_dma.c | 29 +++++++++++++++-------------- > 1 file changed, 15 insertions(+), 14 deletions(-) > > diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c > index 88579857ca1d..c8a77b428b52 100644 > --- a/drivers/dma/qcom/bam_dma.c > +++ b/drivers/dma/qcom/bam_dma.c > @@ -1270,13 +1270,13 @@ static int bam_dma_probe(struct platform_device *pdev) > dev_err(bdev->dev, "num-ees unspecified in dt\n"); > } > > - bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk"); > - if (IS_ERR(bdev->bamclk)) { > - if (!bdev->controlled_remotely) > - return PTR_ERR(bdev->bamclk); > + if (bdev->controlled_remotely) > + bdev->bamclk = devm_clk_get_optional(bdev->dev, "bam_clk"); > + else > + bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk"); > > - bdev->bamclk = NULL; > - } > + if (IS_ERR(bdev->bamclk)) > + return PTR_ERR(bdev->bamclk); > > ret = clk_prepare_enable(bdev->bamclk); > if (ret) { > @@ -1350,7 +1350,7 @@ static int bam_dma_probe(struct platform_device *pdev) > if (ret) > goto err_unregister_dma; > > - if (bdev->controlled_remotely) { > + if (!bdev->bamclk) { > pm_runtime_disable(&pdev->dev); > return 0; > } > @@ -1438,10 +1438,10 @@ static int __maybe_unused bam_dma_suspend(struct device *dev) > { > struct bam_device *bdev = dev_get_drvdata(dev); > > - if (!bdev->controlled_remotely) > + if (bdev->bamclk) { > pm_runtime_force_suspend(dev); > - > - clk_unprepare(bdev->bamclk); > + clk_unprepare(bdev->bamclk); > + } > > return 0; > } > @@ -1451,12 +1451,13 @@ static int __maybe_unused bam_dma_resume(struct device *dev) > struct bam_device *bdev = dev_get_drvdata(dev); > int ret; > > - ret = clk_prepare(bdev->bamclk); > - if (ret) > - return ret; > + if (bdev->bamclk) { > + ret = clk_prepare(bdev->bamclk); > + if (ret) > + return ret; > > - if (!bdev->controlled_remotely) > pm_runtime_force_resume(dev); > + } > > return 0; > } > -- > 2.25.1 >
On 26-01-21, 16:18, Thara Gopinath wrote: > When bam dma is "controlled remotely", thus far clocks were not controlled > from the Linux. In this scenario, Linux was disabling runtime pm in bam dma > driver and not doing any clock management in suspend/resume hooks. > > With introduction of crypto engine bam dma, the clock is a rpmh resource > that can be controlled from both Linux and TZ/remote side. Now bam dma > clock is getting enabled during probe even though the bam dma can be > "controlled remotely". But due to clocks not being handled properly, > bam_suspend generates a unbalanced clk_unprepare warning during system > suspend. > > To fix the above issue and to enable proper clock-management, this patch > enables runtim-pm and handles bam dma clocks in suspend/resume hooks if > the clock node is present irrespective of controlled_remotely property. Applied after fixing subsystem name, thanks -- ~Vinod
Hello: This patch was applied to qcom/linux.git (refs/heads/for-next): On Tue, 26 Jan 2021 16:18:59 -0500 you wrote: > When bam dma is "controlled remotely", thus far clocks were not controlled > from the Linux. In this scenario, Linux was disabling runtime pm in bam dma > driver and not doing any clock management in suspend/resume hooks. > > With introduction of crypto engine bam dma, the clock is a rpmh resource > that can be controlled from both Linux and TZ/remote side. Now bam dma > clock is getting enabled during probe even though the bam dma can be > "controlled remotely". But due to clocks not being handled properly, > bam_suspend generates a unbalanced clk_unprepare warning during system > suspend. > > [...] Here is the summary with links: - [v2] dma: qcom: bam_dma: Manage clocks when controlled_remotely is set https://git.kernel.org/qcom/c/123935a4ca93 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c index 88579857ca1d..c8a77b428b52 100644 --- a/drivers/dma/qcom/bam_dma.c +++ b/drivers/dma/qcom/bam_dma.c @@ -1270,13 +1270,13 @@ static int bam_dma_probe(struct platform_device *pdev) dev_err(bdev->dev, "num-ees unspecified in dt\n"); } - bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk"); - if (IS_ERR(bdev->bamclk)) { - if (!bdev->controlled_remotely) - return PTR_ERR(bdev->bamclk); + if (bdev->controlled_remotely) + bdev->bamclk = devm_clk_get_optional(bdev->dev, "bam_clk"); + else + bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk"); - bdev->bamclk = NULL; - } + if (IS_ERR(bdev->bamclk)) + return PTR_ERR(bdev->bamclk); ret = clk_prepare_enable(bdev->bamclk); if (ret) { @@ -1350,7 +1350,7 @@ static int bam_dma_probe(struct platform_device *pdev) if (ret) goto err_unregister_dma; - if (bdev->controlled_remotely) { + if (!bdev->bamclk) { pm_runtime_disable(&pdev->dev); return 0; } @@ -1438,10 +1438,10 @@ static int __maybe_unused bam_dma_suspend(struct device *dev) { struct bam_device *bdev = dev_get_drvdata(dev); - if (!bdev->controlled_remotely) + if (bdev->bamclk) { pm_runtime_force_suspend(dev); - - clk_unprepare(bdev->bamclk); + clk_unprepare(bdev->bamclk); + } return 0; } @@ -1451,12 +1451,13 @@ static int __maybe_unused bam_dma_resume(struct device *dev) struct bam_device *bdev = dev_get_drvdata(dev); int ret; - ret = clk_prepare(bdev->bamclk); - if (ret) - return ret; + if (bdev->bamclk) { + ret = clk_prepare(bdev->bamclk); + if (ret) + return ret; - if (!bdev->controlled_remotely) pm_runtime_force_resume(dev); + } return 0; }
When bam dma is "controlled remotely", thus far clocks were not controlled from the Linux. In this scenario, Linux was disabling runtime pm in bam dma driver and not doing any clock management in suspend/resume hooks. With introduction of crypto engine bam dma, the clock is a rpmh resource that can be controlled from both Linux and TZ/remote side. Now bam dma clock is getting enabled during probe even though the bam dma can be "controlled remotely". But due to clocks not being handled properly, bam_suspend generates a unbalanced clk_unprepare warning during system suspend. To fix the above issue and to enable proper clock-management, this patch enables runtim-pm and handles bam dma clocks in suspend/resume hooks if the clock node is present irrespective of controlled_remotely property. Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org> --- v1->v2: - As per Shawn's suggestion, use devm_clk_get_optional to get the bam clock if the "controlled_remotely" property is set so that the clock code takes care of setting the bam clock to NULL if not specified by dt. - Remove the check for "controlled_remotely" property in bam_dma_resume now that clock enable / disable is based on whether bamclk is NULL or not. - Rebased to v5.11-rc5 drivers/dma/qcom/bam_dma.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) -- 2.25.1