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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 v2 1/6] drm: atmel-hlcdc: use double rate for pixel clock only if supported
Date: Fri, 13 Dec 2019 17:04:51 +0200	[thread overview]
Message-ID: <1576249496-4849-2-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1576249496-4849-1-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


WARNING: multiple messages have this Message-ID (diff)
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: Claudiu Beznea <claudiu.beznea@microchip.com>,
	linux-arm-kernel@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/6] drm: atmel-hlcdc: use double rate for pixel clock only if supported
Date: Fri, 13 Dec 2019 17:04:51 +0200	[thread overview]
Message-ID: <1576249496-4849-2-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1576249496-4849-1-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


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
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: Claudiu Beznea <claudiu.beznea@microchip.com>,
	linux-arm-kernel@lists.infradead.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/6] drm: atmel-hlcdc: use double rate for pixel clock only if supported
Date: Fri, 13 Dec 2019 17:04:51 +0200	[thread overview]
Message-ID: <1576249496-4849-2-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1576249496-4849-1-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

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2019-12-13 20:38 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-13 15:04 [PATCH v2 0/6] fixes for atmel-hlcdc Claudiu Beznea
2019-12-13 15:04 ` Claudiu Beznea
2019-12-13 15:04 ` Claudiu Beznea
2019-12-13 15:04 ` Claudiu Beznea [this message]
2019-12-13 15:04   ` [PATCH v2 1/6] drm: atmel-hlcdc: use double rate for pixel clock only if supported Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04 ` [PATCH v2 2/6] drm: atmel-hlcdc: enable clock before configuring timing engine Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04 ` [PATCH v2 3/6] mfd: atmel-hlcdc: add struct device member to struct atmel_hlcdc_regmap Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-16 16:17   ` Lee Jones
2019-12-16 16:17     ` Lee Jones
2019-12-16 16:17     ` Lee Jones
2019-12-13 15:04 ` [PATCH v2 4/6] mfd: atmel-hlcdc: return in case of error Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-16 16:22   ` Lee Jones
2019-12-16 16:22     ` Lee Jones
2019-12-16 16:22     ` Lee Jones
2019-12-16 16:24   ` Lee Jones
2019-12-16 16:24     ` Lee Jones
2019-12-16 16:24     ` Lee Jones
2019-12-18 10:02     ` Claudiu.Beznea
2019-12-18 10:02       ` Claudiu.Beznea
2019-12-18 10:02       ` Claudiu.Beznea
2019-12-13 15:04 ` [PATCH v2 5/6] drm: atmel-hlcdc: prefer a lower pixel-clock than requested Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04 ` [PATCH v2 6/6] Revert "drm: atmel-hlcdc: enable sys_clk during initalization." Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea
2019-12-13 15:04   ` Claudiu Beznea

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