ARM: mxs: Increase VDDD voltage to match specification

Adoption of U-Boot commit:

| commit b4a2cdc13ed886b981e8fcd3087293ba9296f17f
| Author: Marek Vasut <marex@denx.de>
| Date:   Tue Oct 15 18:26:57 2019 +0200
|
|     arm: mxs: Increase VDDD voltage to match specification
|
|     According to IMX28CEC rev. 4, 10/2018, Table 15. Recommended Operating
|     Conditions, page 16, the VDDD should be set to 1.55V when the CPU is
|     operating at 454MHz. This is the case in U-Boot, hence increase the
|     VDDD voltage. This fixes instability when performing TFTP transfers.
|     Increase the brownout threshold to 1.4V. The documentation recommends
|     1.45V setting for the brownout, however, this triggers failure during
|     power block init, so keep the brownout slightly lower.
|
|     Signed-off-by: Marek Vasut <marex@denx.de>
|     Cc: Stefano Babic <sbabic@denx.de>
|     Reviewed-by: Fabio Estevam <festevam@gmail.com>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/arm/mach-mxs/power-init.c b/arch/arm/mach-mxs/power-init.c
index ca7c349d7f..c89f1f5f5d 100644
--- a/arch/arm/mach-mxs/power-init.c
+++ b/arch/arm/mach-mxs/power-init.c
@@ -1172,7 +1172,7 @@ static void mx23_ungate_power(void)
 	writel(MX23_POWER_CTRL_CLKGATE, &power_regs->hw_power_ctrl_clr);
 }
 
-struct mxs_power_ctrl mxs_vddd_default    = { .target = 1500, .brownout = 1325 };
+struct mxs_power_ctrl mxs_vddd_default    = { .target = 1550, .brownout = 1400 };
 struct mxs_power_ctrl mxs_vdda_default    = { .target = 1800, .brownout = 1650 };
 struct mxs_power_ctrl mxs_vddio_default   = { .target = 3300, .brownout = 3150 };
 struct mxs_power_ctrl mx23_vddmem_default = { .target = 2500, .brownout = 1700 };