colibri-imx6: use dynamic DDR calibration

Enable dynamic DDR calibration to have a reliable behavior on edge
temperatures conditions.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>

diff --git a/board/toradex/colibri_imx6/colibri_imx6.c b/board/toradex/colibri_imx6/colibri_imx6.c
index 3b55f6c..38ff637 100644 (file)
--- a/board/toradex/colibri_imx6/colibri_imx6.c
+++ b/board/toradex/colibri_imx6/colibri_imx6.c
@@ -997,9 +997,28 @@ static void ddr_init(int *table, int size)
                writel(table[2 * i + 1], table[2 * i]);
 }
 
+/* Perform DDR DRAM calibration */
+static void spl_dram_perform_cal(u8 dsize)
+{
+#ifdef CONFIG_MX6_DDRCAL
+       int err;
+       struct mx6_ddr_sysinfo ddr_sysinfo = {
+               .dsize = dsize,
+       };
+
+       err = mmdc_do_write_level_calibration(&ddr_sysinfo);
+       if (err)
+               printf("error %d from write level calibration\n", err);
+       err = mmdc_do_dqs_calibration(&ddr_sysinfo);
+       if (err)
+               printf("error %d from dqs calibration\n", err);
+#endif
+}
+
 static void spl_dram_init(void)
 {
        int minc, maxc;
+       u8 dsize = 2;
 
        switch (get_cpu_temp_grade(&minc, &maxc)) {
        case TEMP_COMMERCIAL:
@@ -1009,6 +1028,7 @@ static void spl_dram_init(void)
                        ddr_init(mx6dl_dcd_table, ARRAY_SIZE(mx6dl_dcd_table));
                } else {
                        puts("Commercial temperature grade DDR3 timings, 32bit bus width.\n");
+                       dsize = 1;
                        ddr_init(mx6s_dcd_table, ARRAY_SIZE(mx6s_dcd_table));
                }
                break;
@@ -1020,11 +1040,13 @@ static void spl_dram_init(void)
                        ddr_init(mx6dl_dcd_table, ARRAY_SIZE(mx6dl_dcd_table));
                } else {
                        puts("Industrial temperature grade DDR3 timings, 32bit bus width.\n");
+                       dsize = 1;
                        ddr_init(mx6s_dcd_table, ARRAY_SIZE(mx6s_dcd_table));
                }
                break;
        };
        udelay(100);
+       spl_dram_perform_cal(dsize);
 }
 
 static iomux_v3_cfg_t const gpio_reset_pad[] = {

diff --git a/configs/colibri_imx6_defconfig b/configs/colibri_imx6_defconfig
index 62a207f..e9c11d7 100644 (file)
--- a/configs/colibri_imx6_defconfig
+++ b/configs/colibri_imx6_defconfig
@@ -10,6 +10,7 @@ CONFIG_SYS_MEMTEST_END=0x10010000
 CONFIG_ENV_SIZE=0x2000
 CONFIG_ENV_OFFSET=0xFFFFDE00
 CONFIG_MX6DL=y
+CONFIG_MX6_DDRCAL=y
 CONFIG_TARGET_COLIBRI_IMX6=y
 CONFIG_SYS_I2C_MXC_I2C1=y
 CONFIG_SYS_I2C_MXC_I2C2=y