From: Claudiu Beznea <claudiu.beznea@microchip.com>
To: <sam@ravnborg.org>, <bbrezillon@kernel.org>, <airlied@linux.ie>,
<daniel@ffwll.ch>, <nicolas.ferre@microchip.com>,
<alexandre.belloni@bootlin.com>,
<ludovic.desroches@microchip.com>, <lee.jones@linaro.org>
Cc: <dri-devel@lists.freedesktop.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Claudiu Beznea <claudiu.beznea@microchip.com>
Subject: [PATCH 1/5] drm: atmel-hlcdc: use double rate for pixel clock only if supported
Date: Tue, 10 Dec 2019 15:24:43 +0200 [thread overview]
Message-ID: <1575984287-26787-2-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1575984287-26787-1-git-send-email-claudiu.beznea@microchip.com>
Doubled system clock should be used as pixel cock source only if this
is supported. This is emphasized by the value of
atmel_hlcdc_crtc::dc::desc::fixed_clksrc.
Fixes: a6eca2abdd42 ("drm: atmel-hlcdc: add config option for clock selection")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
index f2e73e6d46b8..5040ed8d0871 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -95,14 +95,14 @@ static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
(adj->crtc_hdisplay - 1) |
((adj->crtc_vdisplay - 1) << 16));
+ prate = clk_get_rate(crtc->dc->hlcdc->sys_clk);
+ mode_rate = adj->crtc_clock * 1000;
if (!crtc->dc->desc->fixed_clksrc) {
+ prate *= 2;
cfg |= ATMEL_HLCDC_CLKSEL;
mask |= ATMEL_HLCDC_CLKSEL;
}
- prate = 2 * clk_get_rate(crtc->dc->hlcdc->sys_clk);
- mode_rate = adj->crtc_clock * 1000;
-
div = DIV_ROUND_UP(prate, mode_rate);
if (div < 2) {
div = 2;
--
2.7.4
next prev parent reply other threads:[~2019-12-10 13:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-10 13:24 [PATCH 0/5] fixes for atmel-hlcdc Claudiu Beznea
2019-12-10 13:24 ` Claudiu Beznea [this message]
2019-12-10 13:24 ` [PATCH 2/5] drm: atmel-hlcdc: enable clock before configuring timing engine Claudiu Beznea
2019-12-10 20:18 ` Sam Ravnborg
2019-12-10 13:24 ` [PATCH 3/5] mfd: atmel-hlcdc: return in case of error Claudiu Beznea
2019-12-10 20:37 ` Sam Ravnborg
2019-12-11 12:07 ` Claudiu.Beznea
2019-12-10 13:24 ` [PATCH 4/5] Revert "drm/atmel-hlcdc: allow selecting a higher pixel-clock than requested" Claudiu Beznea
2019-12-10 14:11 ` Peter Rosin
2019-12-10 14:59 ` Claudiu.Beznea
2019-12-10 17:22 ` Peter Rosin
2019-12-11 11:45 ` Claudiu.Beznea
2019-12-11 13:28 ` Peter Rosin
2019-12-13 9:28 ` Claudiu.Beznea
2019-12-13 9:30 ` Peter Rosin
2019-12-10 13:24 ` [PATCH 5/5] Revert "drm: atmel-hlcdc: enable sys_clk during initalization." Claudiu Beznea
2019-12-10 20:34 ` Sam Ravnborg
2019-12-11 11:55 ` Claudiu.Beznea
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