linux-kernel - Re: [PATCH v9 01/11] drm/i915: Use 64-bit division macro

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Date:   Wed, 18 Mar 2020 21:08:45 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Guru Das Srinagesh <gurus@...eaurora.org>,
        linux-pwm@...r.kernel.org
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <uwe@...ine-koenig.org>,
        Subbaraman Narayanamurthy <subbaram@...eaurora.org>,
        linux-kernel@...r.kernel.org,
        Guru Das Srinagesh <gurus@...eaurora.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Subject: Re: [PATCH v9 01/11] drm/i915: Use 64-bit division macro

On Tue, 17 Mar 2020, Guru Das Srinagesh <gurus@...eaurora.org> wrote:
> Since the PWM framework is switching struct pwm_state.duty_cycle's
> datatype to u64, prepare for this transition by using DIV_ROUND_UP_ULL
> to handle a 64-bit dividend.
>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: "Ville Syrjälä" <ville.syrjala@...ux.intel.com>
> Cc: intel-gfx@...ts.freedesktop.org
> Cc: dri-devel@...ts.freedesktop.org
> Cc: Rodrigo Vivi <rodrigo.vivi@...el.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
>
> Signed-off-by: Guru Das Srinagesh <gurus@...eaurora.org>

Reviewed-by: Jani Nikula <jani.nikula@...el.com>

Also ack for merging this via whichever tree you prefer; please let me
know if you want me to take this via drm-intel.

> ---
>  drivers/gpu/drm/i915/display/intel_panel.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
> index bc14e9c..843cac1 100644
> --- a/drivers/gpu/drm/i915/display/intel_panel.c
> +++ b/drivers/gpu/drm/i915/display/intel_panel.c
> @@ -1868,7 +1868,7 @@ static int pwm_setup_backlight(struct intel_connector *connector,
>  
>  	panel->backlight.min = 0; /* 0% */
>  	panel->backlight.max = 100; /* 100% */
> -	panel->backlight.level = DIV_ROUND_UP(
> +	panel->backlight.level = DIV_ROUND_UP_ULL(
>  				 pwm_get_duty_cycle(panel->backlight.pwm) * 100,
>  				 CRC_PMIC_PWM_PERIOD_NS);
>  	panel->backlight.enabled = panel->backlight.level != 0;

-- 
Jani Nikula, Intel Open Source Graphics Center