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From: Philipp Zabel <p.zabel@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH] ARM i.MX6: Gate clocks to graphics processing units
Date: Fri, 21 Feb 2014 18:37:57 +0100	[thread overview]
Message-ID: <1393004277-9417-1-git-send-email-p.zabel@pengutronix.de> (raw)

This patch gates the clocks to GPU, IPU, and VPU units by default,
significantly reducing the VDDSOC power draw while barebox is running.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
 arch/arm/mach-imx/clk-imx6.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-imx/clk-imx6.c b/arch/arm/mach-imx/clk-imx6.c
index c32b6cc..ac86074 100644
--- a/arch/arm/mach-imx/clk-imx6.c
+++ b/arch/arm/mach-imx/clk-imx6.c
@@ -307,12 +307,12 @@ static int imx6_ccm_probe(struct device_d *dev)
 	clkdev_add_physbase(clks[enfc_podf], MX6_GPMI_BASE_ADDR, NULL);
 
 	writel(0xffffffff, ccm_base + CCGR0);
-	writel(0xffffffff, ccm_base + CCGR1);
+	writel(0xf0ffffff, ccm_base + CCGR1); /* gate GPU3D, GPU2D */
 	writel(0xffffffff, ccm_base + CCGR2);
-	writel(0xffffffff, ccm_base + CCGR3);
+	writel(0x3fff0000, ccm_base + CCGR3); /* gate OpenVG, LDB, IPU1, IPU2 */
 	writel(0xffffffff, ccm_base + CCGR4);
 	writel(0xffffffff, ccm_base + CCGR5);
-	writel(0xffffffff, ccm_base + CCGR6);
+	writel(0xffff3fff, ccm_base + CCGR6); /* gate VPU */
 	writel(0xffffffff, ccm_base + CCGR7);
 
 	clk_enable(clks[pll6_enet]);
-- 
1.9.0.rc3


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             reply	other threads:[~2014-02-21 17:38 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-21 17:37 Philipp Zabel [this message]
2014-02-24  8:31 ` Sascha Hauer

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