ddr: imx: Save the FW loading if it hasn't changed
Function ddr_load_train_firmware() is called 4 times in a loop by
ddr_cfg_phy(). The first 3 calls are all '1D' type and just loading the
same FWs. Let's add a type check and save 2 of them. This helps to
reduce DDRPHY training time from 269 ms down to 212 ms, and thus speed
up boot time ~ 50 ms.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/drivers/ddr/imx/phy/helper.c b/drivers/ddr/imx/phy/helper.c
index 855a874..b9b2403 100644
--- a/drivers/ddr/imx/phy/helper.c
+++ b/drivers/ddr/imx/phy/helper.c
@@ -49,6 +49,13 @@
unsigned long imem_start = (unsigned long)_end + fw_offset;
unsigned long dmem_start;
unsigned long imem_len = IMEM_LEN, dmem_len = DMEM_LEN;
+ static enum fw_type last_type = -1;
+
+ /* If FW doesn't change, we can save the loading. */
+ if (last_type == type)
+ return;
+
+ last_type = type;
#ifdef CONFIG_SPL_OF_CONTROL
if (gd->fdt_blob && !fdt_check_header(gd->fdt_blob)) {