linux-kernel - [PATCH 2/3] clk: meson: g12a: set CLK_MUX_ROUND

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Date:   Thu, 19 Sep 2019 11:36:26 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     jbrunet@...libre.com
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-clk@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] clk: meson: g12a: set CLK_MUX_ROUND_CLOSEST on the cpu clock muxes

When setting the 100MHz, 500MHz, 666MHz and 1GHz rate for CPU clocks,
CCF will use the SYS_PLL to handle these frequencies, but:
- using FIXED_PLL derived FCLK_DIV2/DIV3 clocks is more precise
- the Amlogic G12A/G12B/SM1 Suspend handling in firmware doesn't
  handle entering suspend using SYS_PLL for these frequencies

Adding CLK_MUX_ROUND_CLOSEST on all the muxes of the non-SYS_PLL
cpu clock tree helps CCF always selecting the FCLK_DIV2/DIV3 as source
for these frequencies.

Fixes: ffae8475b90c ("clk: meson: g12a: add notifiers to handle cpu clock change")
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/clk/meson/g12a.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/clk/meson/g12a.c b/drivers/clk/meson/g12a.c
index 33c7e04b4a82..b3af61cc6fb9 100644
--- a/drivers/clk/meson/g12a.c
+++ b/drivers/clk/meson/g12a.c
@@ -343,6 +343,7 @@ static struct clk_regmap g12a_cpu_clk_premux0 = {
 		.offset = HHI_SYS_CPU_CLK_CNTL0,
 		.mask = 0x3,
 		.shift = 0,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpu_clk_dyn0_sel",
@@ -409,6 +410,7 @@ static struct clk_regmap g12a_cpu_clk_postmux0 = {
 		.offset = HHI_SYS_CPU_CLK_CNTL0,
 		.mask = 0x1,
 		.shift = 2,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpu_clk_dyn0",
@@ -465,6 +467,7 @@ static struct clk_regmap g12a_cpu_clk_dyn = {
 		.offset = HHI_SYS_CPU_CLK_CNTL0,
 		.mask = 0x1,
 		.shift = 10,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpu_clk_dyn",
@@ -484,6 +487,7 @@ static struct clk_regmap g12a_cpu_clk = {
 		.offset = HHI_SYS_CPU_CLK_CNTL0,
 		.mask = 0x1,
 		.shift = 11,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpu_clk",
@@ -503,6 +507,7 @@ static struct clk_regmap g12b_cpu_clk = {
 		.offset = HHI_SYS_CPU_CLK_CNTL0,
 		.mask = 0x1,
 		.shift = 11,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpu_clk",
@@ -522,6 +527,7 @@ static struct clk_regmap g12b_cpub_clk_premux0 = {
 		.offset = HHI_SYS_CPUB_CLK_CNTL,
 		.mask = 0x3,
 		.shift = 0,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpub_clk_dyn0_sel",
@@ -567,6 +573,7 @@ static struct clk_regmap g12b_cpub_clk_postmux0 = {
 		.offset = HHI_SYS_CPUB_CLK_CNTL,
 		.mask = 0x1,
 		.shift = 2,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpub_clk_dyn0",
@@ -644,6 +651,7 @@ static struct clk_regmap g12b_cpub_clk_dyn = {
 		.offset = HHI_SYS_CPUB_CLK_CNTL,
 		.mask = 0x1,
 		.shift = 10,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpub_clk_dyn",
@@ -663,6 +671,7 @@ static struct clk_regmap g12b_cpub_clk = {
 		.offset = HHI_SYS_CPUB_CLK_CNTL,
 		.mask = 0x1,
 		.shift = 11,
+		.flags = CLK_MUX_ROUND_CLOSEST,
 	},
 	.hw.init = &(struct clk_init_data){
 		.name = "cpub_clk",
-- 
2.22.0