From 7490062ff86e1132b95bf153091f28f7940c0cf9 Mon Sep 17 00:00:00 2001 From: "Ye.Li" Date: Mon, 30 Mar 2015 16:03:13 +0800 Subject: MLK-10504 imx: mx6dqarm2: Fix CCM setting for lpddr2 400Mhz support Current uboot supports for running LPDDR2 at 400MHz on MX6Q ARM2 board, but there is a problem in switching pre_periph_clk_sel to pll2_pfd2. We cannot directly change the parent of pre_periph_clk_sel as this mux is not a glitchless mux. We need to follow the correct procedure and wait for the busy bits to clear before switching. Change to follow the procedure: 1. Set periph_clk2 to OSC. 2. Switch the periph_clk to periph_clk2, checking the CCM_CDHIPR for periph_clk , ahb_podf and axi_podf busy bits. 3. Setting the pre_periph_clk to PLL2 PFD 396M. 4. Switch the periph_clk back to pre_periph_clk and checking CCM_CDHIPR busy bits. Signed-off-by: Ye.Li --- board/freescale/mx6qarm2/imximage.cfg | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/board/freescale/mx6qarm2/imximage.cfg b/board/freescale/mx6qarm2/imximage.cfg index 8fba8aa..24b2c2b 100644 --- a/board/freescale/mx6qarm2/imximage.cfg +++ b/board/freescale/mx6qarm2/imximage.cfg @@ -211,6 +211,12 @@ DATA 4, 0x020e001c, 0x007F007F #elif defined(CONFIG_MX6DQ_LPDDR2) /* DCD */ +DATA 4 0x020C4018 0x21324 +DATA 4 0x020C4014 0x2018D00 +CHECK_BITS_CLR 4 0x020C4048 0x3F +DATA 4 0x020C4018 0x61324 +DATA 4 0x020C4014 0x18D00 +CHECK_BITS_CLR 4 0x020C4048 0x3F DATA 4 0x020C4018 0x60324 DATA 4 0x020E05a8 0x00003038 -- cgit v1.1