linux-kernel - Re: [PATCH v2 10/33] drm/modes: Add a function to generate analog display modes

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Message-ID: <87h70y4ffb.fsf@intel.com>
Date:   Fri, 23 Sep 2022 12:18:32 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Thomas Zimmermann <tzimmermann@...e.de>,
        Maxime Ripard <maxime@...no.tech>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Maxime Ripard <mripard@...nel.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Emma Anholt <emma@...olt.net>,
        Karol Herbst <kherbst@...hat.com>,
        Samuel Holland <samuel@...lland.org>,
        Daniel Vetter <daniel@...ll.ch>, Lyude Paul <lyude@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, nouveau@...ts.freedesktop.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.com>,
        intel-gfx@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Dom Cobley <dom@...pberrypi.com>, linux-sunxi@...ts.linux.dev,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 10/33] drm/modes: Add a function to generate analog
 display modes

On Fri, 23 Sep 2022, Thomas Zimmermann <tzimmermann@...e.de> wrote:
> Am 22.09.22 um 16:25 schrieb Maxime Ripard:
>> +	drm_dbg_kms(dev,
>> +		    "Generating a %ux%u%c, %u-line mode with a %lu kHz clock\n",
>> +		    hactive, vactive,
>> +		    interlace ? 'i' : 'p',
>> +		    params->num_lines,
>> +		    pixel_clock_hz / 1000);
>
> Divide by HZ_PER_KHZ here and in other places.
>
>    https://elixir.bootlin.com/linux/latest/source/include/linux/units.h#L23

>From the Department of Bikeshedding:

I find "pixel_clock_hz / 1000" has much more clarity than
"pixel_clock_hz / HZ_PER_KHZ".

I don't consider the SI prefixes magic numbers.


BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center