Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Janusz Krzysztofik <jmkrzyszt@gmail.com>
To:     Ulf Hansson <ulf.hansson@linaro.org>
Cc:     Tony Lindgren <tony@atomide.com>, Paul Walmsley <paul@pwsan.com>,
        Aaro Koskinen <aaro.koskinen@iki.fi>,
        Alan Stern <stern@rowland.harvard.edu>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Helge Deller <deller@gmx.de>, linux-omap@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org,
        linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        Arnd Bergmann <arnd@arndb.de>, Felipe Balbi <balbi@kernel.org>,
        Peter Ujfalusi <peter.ujfalusi@gmail.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>, linux-mmc@vger.kernel.org,
        alsa-devel@alsa-project.org,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>
Subject: Re: [PATCH v2] ARM: OMAP1: Prepare for conversion of OMAP1 clocks to CCF
Date:   Thu, 31 Mar 2022 20:29:26 +0200
Message-ID: <3657229.kQq0lBPeGt@dell>
In-Reply-To: <CAPDyKFo3sD-5OrfknMQt10D8A7ygMCUW3PV7EQ7L_MB9GxEDbQ@mail.gmail.com>
References: <20220310233307.99220-3-jmkrzyszt@gmail.com> <20220321215416.236250-1-jmkrzyszt@gmail.com> <CAPDyKFo3sD-5OrfknMQt10D8A7ygMCUW3PV7EQ7L_MB9GxEDbQ@mail.gmail.com>
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Hi Uffe,

On Thursday, 31 March 2022 11:19:43 CEST Ulf Hansson wrote:
> On Mon, 21 Mar 2022 at 22:54, Janusz Krzysztofik <jmkrzyszt@gmail.com> wrote:
> >
> > In preparation for conversion of OMAP1 clocks to common clock framework,
> > identify users of those clocks which don't call clk_prepare/unprepare()
> > and update them to call clk_prepare_enable/clk_disable_unprepare() instead
> > of just clk_enable/disable(), as required by CCF implementation of clock
> > API.
> >
> > v2: update still a few more OMAP specific drivers missed in v1,
> >   - call clk_prepare/unprepare() just after/before clk_get/put() where it
> >     can make more sense than merging prepare/unprepare with enable/disable.
> >
> > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> 
> Is there a specific reason why you can't split this into a per subsystem patch?
> 
> Don't get me wrong, if you need my ack you have it, but I just wanted
> to know why this is?

There is no specific reason, I just didn't think of that, and indeed, that 
is perfectly possible and will be more easy to handle.  Please expect a 
separate patch for each subsystem soon.

Thanks,
Janusz

> 
> Kind regards
> Uffe
> 
> > ---
> >  arch/arm/mach-omap1/mcbsp.c       |  8 ++++----
> >  arch/arm/mach-omap1/ocpi.c        |  4 ++--
> >  arch/arm/mach-omap1/serial.c      |  6 +++---
> >  arch/arm/mach-omap1/timer32k.c    |  2 +-
> >  drivers/mmc/host/omap.c           | 23 ++++++++++++++---------
> >  drivers/usb/gadget/udc/omap_udc.c | 14 ++++++++------
> >  drivers/usb/host/ohci-omap.c      | 18 ++++++++++++++++--
> >  drivers/video/fbdev/omap/hwa742.c |  6 +++---
> >  drivers/video/fbdev/omap/lcdc.c   |  6 +++---
> >  drivers/video/fbdev/omap/sossi.c  |  5 +++--
> >  sound/soc/ti/osk5912.c            |  9 ++++++++-
> >  11 files changed, 65 insertions(+), 36 deletions(-)
> >
> > diff --git a/arch/arm/mach-omap1/mcbsp.c b/arch/arm/mach-omap1/mcbsp.c
> > index f36c34f47f11..3ec2badff6af 100644
> > --- a/arch/arm/mach-omap1/mcbsp.c
> > +++ b/arch/arm/mach-omap1/mcbsp.c
> > @@ -44,8 +44,8 @@ static void omap1_mcbsp_request(unsigned int id)
> >                         api_clk = clk_get(NULL, "api_ck");
> >                         dsp_clk = clk_get(NULL, "dsp_ck");
> >                         if (!IS_ERR(api_clk) && !IS_ERR(dsp_clk)) {
> > -                               clk_enable(api_clk);
> > -                               clk_enable(dsp_clk);
> > +                               clk_prepare_enable(api_clk);
> > +                               clk_prepare_enable(dsp_clk);
> >
> >                                 /*
> >                                  * DSP external peripheral reset
> > @@ -63,11 +63,11 @@ static void omap1_mcbsp_free(unsigned int id)
> >         if (id == 0 || id == 2) {
> >                 if (--dsp_use == 0) {
> >                         if (!IS_ERR(api_clk)) {
> > -                               clk_disable(api_clk);
> > +                               clk_disable_unprepare(api_clk);
> >                                 clk_put(api_clk);
> >                         }
> >                         if (!IS_ERR(dsp_clk)) {
> > -                               clk_disable(dsp_clk);
> > +                               clk_disable_unprepare(dsp_clk);
> >                                 clk_put(dsp_clk);
> >                         }
> >                 }
> > diff --git a/arch/arm/mach-omap1/ocpi.c b/arch/arm/mach-omap1/ocpi.c
> > index 380ea2de58c1..03cc48024fd6 100644
> > --- a/arch/arm/mach-omap1/ocpi.c
> > +++ b/arch/arm/mach-omap1/ocpi.c
> > @@ -73,7 +73,7 @@ static int __init omap_ocpi_init(void)
> >         if (IS_ERR(ocpi_ck))
> >                 return PTR_ERR(ocpi_ck);
> >
> > -       clk_enable(ocpi_ck);
> > +       clk_prepare_enable(ocpi_ck);
> >         ocpi_enable();
> >         pr_info("OMAP OCPI interconnect driver loaded\n");
> >
> > @@ -87,7 +87,7 @@ static void __exit omap_ocpi_exit(void)
> >         if (!cpu_is_omap16xx())
> >                 return;
> >
> > -       clk_disable(ocpi_ck);
> > +       clk_disable_unprepare(ocpi_ck);
> >         clk_put(ocpi_ck);
> >  }
> >
> > diff --git a/arch/arm/mach-omap1/serial.c b/arch/arm/mach-omap1/serial.c
> > index 9eb591fbfd89..5f591a836ab5 100644
> > --- a/arch/arm/mach-omap1/serial.c
> > +++ b/arch/arm/mach-omap1/serial.c
> > @@ -141,7 +141,7 @@ void __init omap_serial_init(void)
> >                         if (IS_ERR(uart1_ck))
> >                                 printk("Could not get uart1_ck\n");
> >                         else {
> > -                               clk_enable(uart1_ck);
> > +                               clk_prepare_enable(uart1_ck);
> >                                 if (cpu_is_omap15xx())
> >                                         clk_set_rate(uart1_ck, 12000000);
> >                         }
> > @@ -151,7 +151,7 @@ void __init omap_serial_init(void)
> >                         if (IS_ERR(uart2_ck))
> >                                 printk("Could not get uart2_ck\n");
> >                         else {
> > -                               clk_enable(uart2_ck);
> > +                               clk_prepare_enable(uart2_ck);
> >                                 if (cpu_is_omap15xx())
> >                                         clk_set_rate(uart2_ck, 12000000);
> >                                 else
> > @@ -163,7 +163,7 @@ void __init omap_serial_init(void)
> >                         if (IS_ERR(uart3_ck))
> >                                 printk("Could not get uart3_ck\n");
> >                         else {
> > -                               clk_enable(uart3_ck);
> > +                               clk_prepare_enable(uart3_ck);
> >                                 if (cpu_is_omap15xx())
> >                                         clk_set_rate(uart3_ck, 12000000);
> >                         }
> > diff --git a/arch/arm/mach-omap1/timer32k.c b/arch/arm/mach-omap1/timer32k.c
> > index 780fdf03c3ce..049c7b7f28c4 100644
> > --- a/arch/arm/mach-omap1/timer32k.c
> > +++ b/arch/arm/mach-omap1/timer32k.c
> > @@ -180,7 +180,7 @@ int __init omap_32k_timer_init(void)
> >
> >                 sync32k_ick = clk_get(NULL, "omap_32ksync_ick");
> >                 if (!IS_ERR(sync32k_ick))
> > -                       clk_enable(sync32k_ick);
> > +                       clk_prepare_enable(sync32k_ick);
> >
> >                 ret = omap_init_clocksource_32k(base);
> >         }
> > diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
> > index 5e5af34090f1..57d39283924d 100644
> > --- a/drivers/mmc/host/omap.c
> > +++ b/drivers/mmc/host/omap.c
> > @@ -1374,7 +1374,7 @@ static int mmc_omap_probe(struct platform_device *pdev)
> >         host->iclk = clk_get(&pdev->dev, "ick");
> >         if (IS_ERR(host->iclk))
> >                 return PTR_ERR(host->iclk);
> > -       clk_enable(host->iclk);
> > +       clk_prepare_enable(host->iclk);
> >
> >         host->fclk = clk_get(&pdev->dev, "fck");
> >         if (IS_ERR(host->fclk)) {
> > @@ -1382,16 +1382,18 @@ static int mmc_omap_probe(struct platform_device *pdev)
> >                 goto err_free_iclk;
> >         }
> >
> > +       ret = clk_prepare(host->fclk);
> > +       if (ret)
> > +               goto err_put_fclk;
> > +
> >         host->dma_tx_burst = -1;
> >         host->dma_rx_burst = -1;
> >
> >         host->dma_tx = dma_request_chan(&pdev->dev, "tx");
> >         if (IS_ERR(host->dma_tx)) {
> >                 ret = PTR_ERR(host->dma_tx);
> > -               if (ret == -EPROBE_DEFER) {
> > -                       clk_put(host->fclk);
> > -                       goto err_free_iclk;
> > -               }
> > +               if (ret == -EPROBE_DEFER)
> > +                       goto err_free_fclk;
> >
> >                 host->dma_tx = NULL;
> >                 dev_warn(host->dev, "TX DMA channel request failed\n");
> > @@ -1403,8 +1405,7 @@ static int mmc_omap_probe(struct platform_device *pdev)
> >                 if (ret == -EPROBE_DEFER) {
> >                         if (host->dma_tx)
> >                                 dma_release_channel(host->dma_tx);
> > -                       clk_put(host->fclk);
> > -                       goto err_free_iclk;
> > +                       goto err_free_fclk;
> >                 }
> >
> >                 host->dma_rx = NULL;
> > @@ -1454,9 +1455,12 @@ static int mmc_omap_probe(struct platform_device *pdev)
> >                 dma_release_channel(host->dma_tx);
> >         if (host->dma_rx)
> >                 dma_release_channel(host->dma_rx);
> > +err_free_fclk:
> > +       clk_unprepare(host->fclk);
> > +err_put_fclk:
> >         clk_put(host->fclk);
> >  err_free_iclk:
> > -       clk_disable(host->iclk);
> > +       clk_disable_unprepare(host->iclk);
> >         clk_put(host->iclk);
> >         return ret;
> >  }
> > @@ -1476,8 +1480,9 @@ static int mmc_omap_remove(struct platform_device *pdev)
> >
> >         mmc_omap_fclk_enable(host, 0);
> >         free_irq(host->irq, host);
> > +       clk_unprepare(host->fclk);
> >         clk_put(host->fclk);
> > -       clk_disable(host->iclk);
> > +       clk_disable_unprepare(host->iclk);
> >         clk_put(host->iclk);
> >
> >         if (host->dma_tx)
> > diff --git a/drivers/usb/gadget/udc/omap_udc.c b/drivers/usb/gadget/udc/omap_udc.c
> > index 494da00398d7..8768a3280e19 100644
> > --- a/drivers/usb/gadget/udc/omap_udc.c
> > +++ b/drivers/usb/gadget/udc/omap_udc.c
> > @@ -2604,6 +2604,8 @@ static void omap_udc_release(struct device *dev)
> >         if (udc->dc_clk) {
> >                 if (udc->clk_requested)
> >                         omap_udc_enable_clock(0);
> > +               clk_unprepare(udc->hhc_clk);
> > +               clk_unprepare(udc->dc_clk);
> >                 clk_put(udc->hhc_clk);
> >                 clk_put(udc->dc_clk);
> >         }
> > @@ -2768,8 +2770,8 @@ static int omap_udc_probe(struct platform_device *pdev)
> >                 hhc_clk = clk_get(&pdev->dev, "usb_hhc_ck");
> >                 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
> >                 /* can't use omap_udc_enable_clock yet */
> > -               clk_enable(dc_clk);
> > -               clk_enable(hhc_clk);
> > +               clk_prepare_enable(dc_clk);
> > +               clk_prepare_enable(hhc_clk);
> >                 udelay(100);
> >         }
> >
> > @@ -2778,8 +2780,8 @@ static int omap_udc_probe(struct platform_device *pdev)
> >                 hhc_clk = clk_get(&pdev->dev, "l3_ocpi_ck");
> >                 BUG_ON(IS_ERR(dc_clk) || IS_ERR(hhc_clk));
> >                 /* can't use omap_udc_enable_clock yet */
> > -               clk_enable(dc_clk);
> > -               clk_enable(hhc_clk);
> > +               clk_prepare_enable(dc_clk);
> > +               clk_prepare_enable(hhc_clk);
> >                 udelay(100);
> >         }
> >
> > @@ -2927,8 +2929,8 @@ static int omap_udc_probe(struct platform_device *pdev)
> >                 usb_put_phy(xceiv);
> >
> >         if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
> > -               clk_disable(hhc_clk);
> > -               clk_disable(dc_clk);
> > +               clk_disable_unprepare(hhc_clk);
> > +               clk_disable_unprepare(dc_clk);
> >                 clk_put(hhc_clk);
> >                 clk_put(dc_clk);
> >         }
> > diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
> > index 45dcf8292072..2ab2e089a2b7 100644
> > --- a/drivers/usb/host/ohci-omap.c
> > +++ b/drivers/usb/host/ohci-omap.c
> > @@ -281,6 +281,10 @@ static int ohci_hcd_omap_probe(struct platform_device *pdev)
> >                 goto err_put_hcd;
> >         }
> >
> > +       retval = clk_prepare(priv->usb_host_ck);
> > +       if (retval)
> > +               goto err_put_host_ck;
> > +
> >         if (!cpu_is_omap15xx())
> >                 priv->usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
> >         else
> > @@ -288,13 +292,17 @@ static int ohci_hcd_omap_probe(struct platform_device *pdev)
> >
> >         if (IS_ERR(priv->usb_dc_ck)) {
> >                 retval = PTR_ERR(priv->usb_dc_ck);
> > -               goto err_put_host_ck;
> > +               goto err_unprepare_host_ck;
> >         }
> >
> > +       retval = clk_prepare(priv->usb_dc_ck);
> > +       if (retval)
> > +               goto err_put_dc_ck;
> > +
> >         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
> >                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
> >                 retval = -EBUSY;
> > -               goto err_put_dc_ck;
> > +               goto err_unprepare_dc_ck;
> >         }
> >
> >         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
> > @@ -319,8 +327,12 @@ static int ohci_hcd_omap_probe(struct platform_device *pdev)
> >         iounmap(hcd->regs);
> >  err2:
> >         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
> > +err_unprepare_dc_ck:
> > +       clk_unprepare(priv->usb_dc_ck);
> >  err_put_dc_ck:
> >         clk_put(priv->usb_dc_ck);
> > +err_unprepare_host_ck:
> > +       clk_unprepare(priv->usb_host_ck);
> >  err_put_host_ck:
> >         clk_put(priv->usb_host_ck);
> >  err_put_hcd:
> > @@ -355,7 +367,9 @@ static int ohci_hcd_omap_remove(struct platform_device *pdev)
> >         }
> >         iounmap(hcd->regs);
> >         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
> > +       clk_unprepare(priv->usb_dc_ck);
> >         clk_put(priv->usb_dc_ck);
> > +       clk_unprepare(priv->usb_host_ck);
> >         clk_put(priv->usb_host_ck);
> >         usb_put_hcd(hcd);
> >         return 0;
> > diff --git a/drivers/video/fbdev/omap/hwa742.c b/drivers/video/fbdev/omap/hwa742.c
> > index b191bef22d98..9d9fe5c3a7a1 100644
> > --- a/drivers/video/fbdev/omap/hwa742.c
> > +++ b/drivers/video/fbdev/omap/hwa742.c
> > @@ -964,7 +964,7 @@ static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
> >         if ((r = calc_extif_timings(ext_clk, &extif_mem_div)) < 0)
> >                 goto err3;
> >         hwa742.extif->set_timings(&hwa742.reg_timings);
> > -       clk_enable(hwa742.sys_ck);
> > +       clk_prepare_enable(hwa742.sys_ck);
> >
> >         calc_hwa742_clk_rates(ext_clk, &sys_clk, &pix_clk);
> >         if ((r = calc_extif_timings(sys_clk, &extif_mem_div)) < 0)
> > @@ -1023,7 +1023,7 @@ static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
> >
> >         return 0;
> >  err4:
> > -       clk_disable(hwa742.sys_ck);
> > +       clk_disable_unprepare(hwa742.sys_ck);
> >  err3:
> >         hwa742.extif->cleanup();
> >  err2:
> > @@ -1037,7 +1037,7 @@ static void hwa742_cleanup(void)
> >         hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
> >         hwa742.extif->cleanup();
> >         hwa742.int_ctrl->cleanup();
> > -       clk_disable(hwa742.sys_ck);
> > +       clk_disable_unprepare(hwa742.sys_ck);
> >  }
> >
> >  struct lcd_ctrl hwa742_ctrl = {
> > diff --git a/drivers/video/fbdev/omap/lcdc.c b/drivers/video/fbdev/omap/lcdc.c
> > index 7317c9aad677..97d20dc0d1d0 100644
> > --- a/drivers/video/fbdev/omap/lcdc.c
> > +++ b/drivers/video/fbdev/omap/lcdc.c
> > @@ -711,7 +711,7 @@ static int omap_lcdc_init(struct omapfb_device *fbdev, int ext_mode,
> >                 dev_err(fbdev->dev, "failed to adjust LCD rate\n");
> >                 goto fail1;
> >         }
> > -       clk_enable(lcdc.lcd_ck);
> > +       clk_prepare_enable(lcdc.lcd_ck);
> >
> >         r = request_irq(OMAP_LCDC_IRQ, lcdc_irq_handler, 0, MODULE_NAME, fbdev);
> >         if (r) {
> > @@ -746,7 +746,7 @@ static int omap_lcdc_init(struct omapfb_device *fbdev, int ext_mode,
> >  fail3:
> >         free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
> >  fail2:
> > -       clk_disable(lcdc.lcd_ck);
> > +       clk_disable_unprepare(lcdc.lcd_ck);
> >  fail1:
> >         clk_put(lcdc.lcd_ck);
> >  fail0:
> > @@ -760,7 +760,7 @@ static void omap_lcdc_cleanup(void)
> >         free_fbmem();
> >         omap_free_lcd_dma();
> >         free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
> > -       clk_disable(lcdc.lcd_ck);
> > +       clk_disable_unprepare(lcdc.lcd_ck);
> >         clk_put(lcdc.lcd_ck);
> >  }
> >
> > diff --git a/drivers/video/fbdev/omap/sossi.c b/drivers/video/fbdev/omap/sossi.c
> > index 80ac67f27f0d..b9cb8b386627 100644
> > --- a/drivers/video/fbdev/omap/sossi.c
> > +++ b/drivers/video/fbdev/omap/sossi.c
> > @@ -598,7 +598,7 @@ static int sossi_init(struct omapfb_device *fbdev)
> >         l &= ~CONF_SOSSI_RESET_R;
> >         omap_writel(l, MOD_CONF_CTRL_1);
> >
> > -       clk_enable(sossi.fck);
> > +       clk_prepare_enable(sossi.fck);
> >         l = omap_readl(ARM_IDLECT2);
> >         l &= ~(1 << 8);                 /* DMACK_REQ */
> >         omap_writel(l, ARM_IDLECT2);
> > @@ -649,7 +649,7 @@ static int sossi_init(struct omapfb_device *fbdev)
> >         return 0;
> >
> >  err:
> > -       clk_disable(sossi.fck);
> > +       clk_disable_unprepare(sossi.fck);
> >         clk_put(sossi.fck);
> >         return r;
> >  }
> > @@ -657,6 +657,7 @@ static int sossi_init(struct omapfb_device *fbdev)
> >  static void sossi_cleanup(void)
> >  {
> >         omap_lcdc_free_dma_callback();
> > +       clk_unprepare(sossi.fck);
> >         clk_put(sossi.fck);
> >         iounmap(sossi.base);
> >  }
> > diff --git a/sound/soc/ti/osk5912.c b/sound/soc/ti/osk5912.c
> > index 40e29dda7e7a..22da3b335e81 100644
> > --- a/sound/soc/ti/osk5912.c
> > +++ b/sound/soc/ti/osk5912.c
> > @@ -134,6 +134,10 @@ static int __init osk_soc_init(void)
> >                 goto err2;
> >         }
> >
> > +       err = clk_prepare(tlv320aic23_mclk);
> > +       if (err)
> > +               goto err3;
> > +
> >         /*
> >          * Configure 12 MHz output on MCLK.
> >          */
> > @@ -142,7 +146,7 @@ static int __init osk_soc_init(void)
> >                 if (clk_set_rate(tlv320aic23_mclk, CODEC_CLOCK)) {
> >                         printk(KERN_ERR "Cannot set MCLK for AIC23 CODEC\n");
> >                         err = -ECANCELED;
> > -                       goto err3;
> > +                       goto err4;
> >                 }
> >         }
> >
> > @@ -151,6 +155,8 @@ static int __init osk_soc_init(void)
> >
> >         return 0;
> >
> > +err4:
> > +       clk_unprepare(tlv320aic23_mclk);
> >  err3:
> >         clk_put(tlv320aic23_mclk);
> >  err2:
> > @@ -164,6 +170,7 @@ static int __init osk_soc_init(void)
> >
> >  static void __exit osk_soc_exit(void)
> >  {
> > +       clk_unprepare(tlv320aic23_mclk);
> >         clk_put(tlv320aic23_mclk);
> >         platform_device_unregister(osk_snd_device);
> >  }
> > --
> > 2.35.1
> >
>