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

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Message-ID: <6d073586-0962-48b8-1ccf-ba9d8652be26@suse.de>
Date:   Mon, 26 Sep 2022 12:55:24 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Karol Herbst <kherbst@...hat.com>, David Airlie <airlied@...ux.ie>,
        nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Phil Elwell <phil@...pberrypi.com>,
        Emma Anholt <emma@...olt.net>,
        Samuel Holland <samuel@...lland.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Ben Skeggs <bskeggs@...hat.com>, linux-sunxi@...ts.linux.dev,
        intel-gfx@...ts.freedesktop.org,
        Hans de Goede <hdegoede@...hat.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        linux-arm-kernel@...ts.infradead.org,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Dom Cobley <dom@...pberrypi.com>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        Noralf Trønnes <noralf@...nnes.org>
Subject: Re: [PATCH v2 10/33] drm/modes: Add a function to generate analog
 display modes

Hi

Am 26.09.22 um 12:18 schrieb Maxime Ripard:
> On Fri, Sep 23, 2022 at 12:16:13PM +0200, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 23.09.22 um 11:18 schrieb Jani Nikula:
>>> 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".
>>
>> This one's easy to see because it tells you with the _hz postfix. Many
>> places don't and then it quickly gets confusing what units the code's
>> converting.
> 
> So if I add it to places that don't have it explicitly (ie, tests) would
> that be acceptable to both of you?

I'm OK with either. Or just leave it as-is.

A HZ_TO_KHZ macro would be nice, but that's beyond this patchset.

Best regards
Thomas

> 
> Maxime

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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