linux-kernel - Re: [PATCH v2] drm/stm: ltdc: remove clk_round_rate comment

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Date:   Fri, 24 May 2019 10:35:10 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Philippe CORNU <philippe.cornu@...com>
Cc:     Yannick FERTRE <yannick.fertre@...com>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>,
        Vincent ABRIOU <vincent.abriou@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm/stm: ltdc: remove clk_round_rate comment

Le lun. 13 mai 2019 à 16:46, Philippe CORNU <philippe.cornu@...com> a écrit :
>
> Dear Yannick,
>
> Acked-by: Philippe Cornu <philippe.cornu@...com>
>
Applied on drm-misc-next,

Benjamin

> Thank you,
>
> Philippe :-)
>
> On 5/13/19 3:15 PM, Yannick Fertré wrote:
> > Clk_round_rate returns rounded clock without changing
> > the hardware in any way.
> > This function couldn't replace set_rate/get_rate calls.
> > Todo comment has been removed & a new log inserted.
> >
> > Signed-off-by: Yannick Fertré <yannick.fertre@...com>
> > ---
> > Changes in v2:
> >       - Clk_enable & clk_disable are needed for the SOC STM32F7
> >        (not for STM32MP1). I return this part of the patch to make sure the
> >        driver is compatible with all SOC STM32.
> >
> >   drivers/gpu/drm/stm/ltdc.c | 8 +++-----
> >   1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> > index 97912e2..1104e78 100644
> > --- a/drivers/gpu/drm/stm/ltdc.c
> > +++ b/drivers/gpu/drm/stm/ltdc.c
> > @@ -507,11 +507,6 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
> >       struct ltdc_device *ldev = crtc_to_ltdc(crtc);
> >       int rate = mode->clock * 1000;
> >
> > -     /*
> > -      * TODO clk_round_rate() does not work yet. When ready, it can
> > -      * be used instead of clk_set_rate() then clk_get_rate().
> > -      */
> > -
> >       clk_disable(ldev->pixel_clk);
> >       if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
> >               DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
> > @@ -521,6 +516,9 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
> >
> >       adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
> >
> > +     DRM_DEBUG_DRIVER("requested clock %dkHz, adjusted clock %dkHz\n",
> > +                      mode->clock, adjusted_mode->clock);
> > +
> >       return true;
> >   }
> >
> > --
> > 2.7.4
> >
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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