[PATCH 4.19 116/243] clk: meson: Fix GXL HDMI PLL fractional bits width

[Greg Kroah-Hartman]

From: Neil Armstrong <narmstrong@xxxxxxxxxxxx>

[ Upstream commit 21310c39ec01e82ef3ef9bf8ac385b53ccdc158c ]

The GXL Documentation specifies 12 bits for the Fractional bit field,
bit the last bits have a different purpose that we cannot handle right
now, so update the bitwidth to have correct fractional calculations.

Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
[narmstrong: added comment on GXL HHI_HDMI_PLL_CNTL register shift]
Acked-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20181121111922.1277-1-narmstrong@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/clk/meson/gxbb.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/meson/gxbb.c b/drivers/clk/meson/gxbb.c
index d94b65061b9f1..b039909e03cf8 100644
--- a/drivers/clk/meson/gxbb.c
+++ b/drivers/clk/meson/gxbb.c
@@ -295,6 +295,12 @@ static struct clk_regmap gxl_hdmi_pll = {
 			.shift   = 9,
 			.width   = 5,
 		},
+		/*
+		 * On gxl, there is a register shift due to
+		 * HHI_HDMI_PLL_CNTL1 which does not exist on gxbb,
+		 * so we use the HHI_HDMI_PLL_CNTL2 define from GXBB
+		 * instead which is defined at the same offset.
+		 */
 		.frac = {
 			/*
 			 * On gxl, there is a register shift due to
@@ -304,7 +310,7 @@ static struct clk_regmap gxl_hdmi_pll = {
 			 */
 			.reg_off = HHI_HDMI_PLL_CNTL + 4,
 			.shift   = 0,
-			.width   = 12,
+			.width   = 10,
 		},
 		.od = {
 			.reg_off = HHI_HDMI_PLL_CNTL + 8,
-- 
2.20.1