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clk: rs9: fix wrong default value for clock amplitude 

[ Upstream commit 1758c68c81 ]

According to 9FGV0241, 9FGV0441 & 9FGV0841 datasheets, the default
value for the clock amplitude is 0.8V, while the driver assumes 0.7V.

Additionally, define constants for default values for both clock
amplitude and spread spectrum and use them.

Fixes: 892e0ddea1 ("clk: rs9: Add Renesas 9-series PCIe clock generator driver")
Signed-off-by: Catalin Popescu <catalin.popescu@leica-geosystems.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20240415140348.2887619-1-catalin.popescu@leica-geosystems.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Catalin Popescu 2024-04-15 16:03:48 +02:00 committed by Greg Kroah-Hartman
parent dd4b239184
commit 1a91f05ca2
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/clk/clk-renesas-pcie.c
View File

@ -24,10 +24,12 @@
#define RS9_REG_SS_AMP_0V7 0x1
#define RS9_REG_SS_AMP_0V8 0x2
#define RS9_REG_SS_AMP_0V9 0x3
#define RS9_REG_SS_AMP_DEFAULT RS9_REG_SS_AMP_0V8
#define RS9_REG_SS_AMP_MASK 0x3
#define RS9_REG_SS_SSC_100 0
#define RS9_REG_SS_SSC_M025 (1 << 3)
#define RS9_REG_SS_SSC_M050 (3 << 3)
#define RS9_REG_SS_SSC_DEFAULT RS9_REG_SS_SSC_100
#define RS9_REG_SS_SSC_MASK (3 << 3)
#define RS9_REG_SS_SSC_LOCK BIT(5)
#define RS9_REG_SR 0x2
@ -211,8 +213,8 @@ static int rs9_get_common_config(struct rs9_driver_data *rs9)
int ret;
/* Set defaults */
rs9->pll_amplitude = RS9_REG_SS_AMP_0V7;
rs9->pll_ssc = RS9_REG_SS_SSC_100;
rs9->pll_amplitude = RS9_REG_SS_AMP_DEFAULT;
rs9->pll_ssc = RS9_REG_SS_SSC_DEFAULT;
/* Output clock amplitude */
ret = of_property_read_u32(np, "renesas,out-amplitude-microvolt",
@ -253,13 +255,13 @@ static void rs9_update_config(struct rs9_driver_data *rs9)
int i;
/* If amplitude is non-default, update it. */
if (rs9->pll_amplitude != RS9_REG_SS_AMP_0V7) {
if (rs9->pll_amplitude != RS9_REG_SS_AMP_DEFAULT) {
regmap_update_bits(rs9->regmap, RS9_REG_SS, RS9_REG_SS_AMP_MASK,
rs9->pll_amplitude);
}
/* If SSC is non-default, update it. */
if (rs9->pll_ssc != RS9_REG_SS_SSC_100) {
if (rs9->pll_ssc != RS9_REG_SS_SSC_DEFAULT) {
regmap_update_bits(rs9->regmap, RS9_REG_SS, RS9_REG_SS_SSC_MASK,
rs9->pll_ssc);
}