linux-kernel - Re: [PATCH] drm/stm: ltdc: restore calls to clk

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Message-ID: <1e4c4cbf-869e-8b6a-a1d6-cc7dccb2515a@st.com>
Date:   Mon, 27 May 2019 12:27:43 +0000
From:   Philippe CORNU <philippe.cornu@...com>
To:     Benjamin GAIGNARD <benjamin.gaignard@...com>,
        Yannick FERTRE <yannick.fertre@...com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        Alexandre TORGUE <alexandre.torgue@...com>
CC:     "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>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>
Subject: Re: [PATCH] drm/stm: ltdc: restore calls to clk_{enable/disable}

Hi Benjamin,

Many thanks for this fix (and more generally for pushing STM patches on 
misc :-)

Acked-by: Philippe Cornu <philippe.cornu@...com>

Philippe :-)

On 5/27/19 1:58 PM, Benjamin Gaignard wrote:
> From: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> 
> Restore calls to clk_{enable/disable} deleted after applying the wrong
> version of the patch
> 
> Fixes: fd6905fca4f0 ("drm/stm: ltdc: remove clk_round_rate comment")
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
> ---
>   drivers/gpu/drm/stm/ltdc.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> index ae2aaf2a62ee..ac29890edeb6 100644
> --- a/drivers/gpu/drm/stm/ltdc.c
> +++ b/drivers/gpu/drm/stm/ltdc.c
> @@ -507,10 +507,12 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
>   	struct ltdc_device *ldev = crtc_to_ltdc(crtc);
>   	int rate = mode->clock * 1000;
>   
> +	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);
>   		return false;
>   	}
> +	clk_enable(ldev->pixel_clk);
>   
>   	adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
>   
>