From 83083febf55679ee0fc68ba55e9af43add277b58 Mon Sep 17 00:00:00 2001 From: Frieder Schrempf Date: Wed, 11 Dec 2019 10:01:19 +0000 Subject: [PATCH] ddr: imx8m: Return error values from LPDDR4 training In cases when the same SPL should run on boards with i.MX8MM, that differ in DDR configuration, it is necessary to try different parameters and check if the training done by the firmware suceeds or not. Therefore we return the DDR training/initialization success to the upper layer in order to be able to retry with different settings if necessary. Signed-off-by: Frieder Schrempf --- arch/arm/include/asm/arch-imx8m/ddr.h | 6 +++--- drivers/ddr/imx/imx8m/ddr_init.c | 11 +++++++++-- drivers/ddr/imx/imx8m/ddrphy_train.c | 9 +++++++-- drivers/ddr/imx/imx8m/ddrphy_utils.c | 8 ++++---- 4 files changed, 23 insertions(+), 11 deletions(-) diff --git a/arch/arm/include/asm/arch-imx8m/ddr.h b/arch/arm/include/asm/arch-imx8m/ddr.h index 53d4625..7a2a2d8 100644 --- a/arch/arm/include/asm/arch-imx8m/ddr.h +++ b/arch/arm/include/asm/arch-imx8m/ddr.h @@ -703,14 +703,14 @@ struct dram_timing_info { extern struct dram_timing_info dram_timing; void ddr_load_train_firmware(enum fw_type type); -void ddr_init(struct dram_timing_info *timing_info); -void ddr_cfg_phy(struct dram_timing_info *timing_info); +int ddr_init(struct dram_timing_info *timing_info); +int ddr_cfg_phy(struct dram_timing_info *timing_info); void load_lpddr4_phy_pie(void); void ddrphy_trained_csr_save(struct dram_cfg_param *param, unsigned int num); void dram_config_save(struct dram_timing_info *info, unsigned long base); /* utils function for ddr phy training */ -void wait_ddrphy_training_complete(void); +int wait_ddrphy_training_complete(void); void ddrphy_init_set_dfi_clk(unsigned int drate); void ddrphy_init_read_msg_block(enum fw_type type); diff --git a/drivers/ddr/imx/imx8m/ddr_init.c b/drivers/ddr/imx/imx8m/ddr_init.c index 21af66e..af8c142 100644 --- a/drivers/ddr/imx/imx8m/ddr_init.c +++ b/drivers/ddr/imx/imx8m/ddr_init.c @@ -20,9 +20,10 @@ void ddr_cfg_umctl2(struct dram_cfg_param *ddrc_cfg, int num) } } -void ddr_init(struct dram_timing_info *dram_timing) +int ddr_init(struct dram_timing_info *dram_timing) { unsigned int tmp, initial_drate, target_freq; + int ret; debug("DDRINFO: start DRAM init\n"); @@ -98,7 +99,11 @@ void ddr_init(struct dram_timing_info *dram_timing) * accessing relevant PUB registers */ debug("DDRINFO:ddrphy config start\n"); - ddr_cfg_phy(dram_timing); + + ret = ddr_cfg_phy(dram_timing); + if (ret) + return ret; + debug("DDRINFO: ddrphy config done\n"); /* @@ -165,4 +170,6 @@ void ddr_init(struct dram_timing_info *dram_timing) /* save the dram timing config into memory */ dram_config_save(dram_timing, CONFIG_SAVED_DRAM_TIMING_BASE); + + return 0; } diff --git a/drivers/ddr/imx/imx8m/ddrphy_train.c b/drivers/ddr/imx/imx8m/ddrphy_train.c index 18f7ed7..306af82 100644 --- a/drivers/ddr/imx/imx8m/ddrphy_train.c +++ b/drivers/ddr/imx/imx8m/ddrphy_train.c @@ -8,13 +8,14 @@ #include #include -void ddr_cfg_phy(struct dram_timing_info *dram_timing) +int ddr_cfg_phy(struct dram_timing_info *dram_timing) { struct dram_cfg_param *dram_cfg; struct dram_fsp_msg *fsp_msg; unsigned int num; int i = 0; int j = 0; + int ret; /* initialize PHY configuration */ dram_cfg = dram_timing->ddrphy_cfg; @@ -60,7 +61,9 @@ void ddr_cfg_phy(struct dram_timing_info *dram_timing) dwc_ddrphy_apb_wr(0xd0099, 0x0); /* Wait for the training firmware to complete */ - wait_ddrphy_training_complete(); + ret = wait_ddrphy_training_complete(); + if (ret) + return ret; /* Halt the microcontroller. */ dwc_ddrphy_apb_wr(0xd0099, 0x1); @@ -83,4 +86,6 @@ void ddr_cfg_phy(struct dram_timing_info *dram_timing) /* save the ddr PHY trained CSR in memory for low power use */ ddrphy_trained_csr_save(ddrphy_trained_csr, ddrphy_trained_csr_num); + + return 0; } diff --git a/drivers/ddr/imx/imx8m/ddrphy_utils.c b/drivers/ddr/imx/imx8m/ddrphy_utils.c index e605033..863fb43 100644 --- a/drivers/ddr/imx/imx8m/ddrphy_utils.c +++ b/drivers/ddr/imx/imx8m/ddrphy_utils.c @@ -84,7 +84,7 @@ static inline void decode_streaming_message(void) debug("\n"); } -void wait_ddrphy_training_complete(void) +int wait_ddrphy_training_complete(void) { unsigned int mail; @@ -95,10 +95,10 @@ void wait_ddrphy_training_complete(void) decode_streaming_message(); } else if (mail == 0x07) { debug("Training PASS\n"); - break; + return 0; } else if (mail == 0xff) { - printf("Training FAILED\n"); - break; + debug("Training FAILED\n"); + return -1; } } } -- 2.7.4