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drm: atmel-hlcdc: prefer a lower pixel-clock than requested 

The intention was to only select a higher pixel-clock rate than the
requested, if a slight overclocking would result in a rate significantly
closer to the requested rate than if the conservative lower pixel-clock
rate is selected. The fixed patch has the logic the other way around and
actually prefers the higher frequency. Fix that.

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Fixes: 9946a3a9db ("drm/atmel-hlcdc: allow selecting a higher pixel-clock than requested")
Reported-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Cc: Boris Brezillon <boris.brezillon@bootlin.com>
Cc: <stable@vger.kernel.org> # v4.20+
Link: https://patchwork.freedesktop.org/patch/msgid/1576672109-22707-6-git-send-email-claudiu.beznea@microchip.com
This commit is contained in:
Peter Rosin 2019-12-18 14:28:28 +02:00 committed by Sam Ravnborg
parent 2c1fb9d86f
commit 51a19d150b
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
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@ -121,8 +121,8 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
int div_low = prate / mode_rate;
if (div_low >= 2 &&
((prate / div_low - mode_rate) <
10 * (mode_rate - prate / div)))
(10 * (prate / div_low - mode_rate) <
(mode_rate - prate / div)))
/*
* At least 10 times better when using a higher
* frequency than requested, instead of a lower.