linux-kernel - [PATCH 2/3] CLK: HSDK: CGU: support PLL bypassing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200311134115.13257-3-Eugeniy.Paltsev@synopsys.com>
Date:   Wed, 11 Mar 2020 16:41:14 +0300
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     linux-clk@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Subject: [PATCH 2/3] CLK: HSDK: CGU: support PLL bypassing

Support setting PLL to bypass mode to support output frequency
equal to input one.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
---
 drivers/clk/clk-hsdk-pll.c | 61 +++++++++++++++++++++-----------------
 1 file changed, 34 insertions(+), 27 deletions(-)

diff --git a/drivers/clk/clk-hsdk-pll.c b/drivers/clk/clk-hsdk-pll.c
index b47a559f3528..0ea7af57a5b1 100644
--- a/drivers/clk/clk-hsdk-pll.c
+++ b/drivers/clk/clk-hsdk-pll.c
@@ -53,35 +53,37 @@ struct hsdk_pll_cfg {
 	u32 fbdiv;
 	u32 odiv;
 	u32 band;
+	u32 bypass;
 };
 
 static const struct hsdk_pll_cfg asdt_pll_cfg[] = {
-	{ 100000000,  0, 11, 3, 0 },
-	{ 133000000,  0, 15, 3, 0 },
-	{ 200000000,  1, 47, 3, 0 },
-	{ 233000000,  1, 27, 2, 0 },
-	{ 300000000,  1, 35, 2, 0 },
-	{ 333000000,  1, 39, 2, 0 },
-	{ 400000000,  1, 47, 2, 0 },
-	{ 500000000,  0, 14, 1, 0 },
-	{ 600000000,  0, 17, 1, 0 },
-	{ 700000000,  0, 20, 1, 0 },
-	{ 800000000,  0, 23, 1, 0 },
-	{ 900000000,  1, 26, 0, 0 },
-	{ 1000000000, 1, 29, 0, 0 },
-	{ 1100000000, 1, 32, 0, 0 },
-	{ 1200000000, 1, 35, 0, 0 },
-	{ 1300000000, 1, 38, 0, 0 },
-	{ 1400000000, 1, 41, 0, 0 },
-	{ 1500000000, 1, 44, 0, 0 },
-	{ 1600000000, 1, 47, 0, 0 },
+	{ 100000000,  0, 11, 3, 0, 0 },
+	{ 133000000,  0, 15, 3, 0, 0 },
+	{ 200000000,  1, 47, 3, 0, 0 },
+	{ 233000000,  1, 27, 2, 0, 0 },
+	{ 300000000,  1, 35, 2, 0, 0 },
+	{ 333000000,  1, 39, 2, 0, 0 },
+	{ 400000000,  1, 47, 2, 0, 0 },
+	{ 500000000,  0, 14, 1, 0, 0 },
+	{ 600000000,  0, 17, 1, 0, 0 },
+	{ 700000000,  0, 20, 1, 0, 0 },
+	{ 800000000,  0, 23, 1, 0, 0 },
+	{ 900000000,  1, 26, 0, 0, 0 },
+	{ 1000000000, 1, 29, 0, 0, 0 },
+	{ 1100000000, 1, 32, 0, 0, 0 },
+	{ 1200000000, 1, 35, 0, 0, 0 },
+	{ 1300000000, 1, 38, 0, 0, 0 },
+	{ 1400000000, 1, 41, 0, 0, 0 },
+	{ 1500000000, 1, 44, 0, 0, 0 },
+	{ 1600000000, 1, 47, 0, 0, 0 },
 	{}
 };
 
 static const struct hsdk_pll_cfg hdmi_pll_cfg[] = {
-	{ 297000000,  0, 21, 2, 0 },
-	{ 540000000,  0, 19, 1, 0 },
-	{ 594000000,  0, 21, 1, 0 },
+	{ 27000000,   0, 0,  0, 0, 1 },
+	{ 297000000,  0, 21, 2, 0, 0 },
+	{ 540000000,  0, 19, 1, 0, 0 },
+	{ 594000000,  0, 21, 1, 0, 0 },
 	{}
 };
 
@@ -134,11 +136,16 @@ static inline void hsdk_pll_set_cfg(struct hsdk_pll_clk *clk,
 {
 	u32 val = 0;
 
-	/* Powerdown and Bypass bits should be cleared */
-	val |= cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT;
-	val |= cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT;
-	val |= cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT;
-	val |= cfg->band << CGU_PLL_CTRL_BAND_SHIFT;
+	if (cfg->bypass) {
+		val = hsdk_pll_read(clk, CGU_PLL_CTRL);
+		val |= CGU_PLL_CTRL_BYPASS;
+	} else {
+		/* Powerdown and Bypass bits should be cleared */
+		val |= cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT;
+		val |= cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT;
+		val |= cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT;
+		val |= cfg->band << CGU_PLL_CTRL_BAND_SHIFT;
+	}
 
 	dev_dbg(clk->dev, "write configuration: %#x\n", val);
 
-- 
2.21.1