On Tue, Sep 07, 2021 at 09:41:23PM +0200, Jan Kiszka wrote:
On 02.09.21 08:36, Jan Kiszka wrote:
On 28.07.21 11:10, Jan Kiszka wrote:
On 30.01.20 09:05, Roger Quadros wrote:
NB0 is bridge to SRAM and NB1 is bridge to DDR.
To ensure that SRAM transfers are not stalled due to delays during DDR refreshes, SRAM traffic should be higher priority (threadmap=2) than DDR traffic (threadmap=0).
This patch does just that.
This is required to fix ICSSG TX lock-ups due to delays in MSMC transfers due to incorrect Northbridge configuration.
Signed-off-by: Roger Quadros rogerq@ti.com Acked-by: Andrew F. Davis afd@ti.com Acked-by: Tomi Valkeinen tomi.valkeinen@ti.com Acked-by: Benoit Parrot bparrot@ti.com
arch/arm/mach-k3/am6_init.c | 14 ++++++++++++++ arch/arm/mach-k3/include/mach/am6_hardware.h | 7 +++++++ 2 files changed, 21 insertions(+)
diff --git a/arch/arm/mach-k3/am6_init.c b/arch/arm/mach-k3/am6_init.c index 8d107b870b..9379b95bdb 100644 --- a/arch/arm/mach-k3/am6_init.c +++ b/arch/arm/mach-k3/am6_init.c @@ -86,6 +86,18 @@ static void store_boot_index_from_rom(void) bootindex = *(u32 *)(CONFIG_SYS_K3_BOOT_PARAM_TABLE_INDEX); }
+static void setup_am654_navss_northbridge(void) +{
- /*
* NB0 is bridge to SRAM and NB1 is bridge to DDR.* To ensure that SRAM transfers are not stalled due to* delays during DDR refreshes, SRAM traffic should be higher* priority (threadmap=2) than DDR traffic (threadmap=0).*/- writel(0x2, NAVSS0_NBSS_NB0_CFG_BASE + NAVSS_NBSS_THREADMAP);
- writel(0x0, NAVSS0_NBSS_NB1_CFG_BASE + NAVSS_NBSS_THREADMAP);
+}
void board_init_f(ulong dummy) { #if defined(CONFIG_K3_LOAD_SYSFW) || defined(CONFIG_K3_AM654_DDRSS) @@ -101,6 +113,8 @@ void board_init_f(ulong dummy) /* Make all control module registers accessible */ ctrl_mmr_unlock();
- setup_am654_navss_northbridge();
#ifdef CONFIG_CPU_V7R disable_linefill_optimization(); setup_k3_mpu_regions(); diff --git a/arch/arm/mach-k3/include/mach/am6_hardware.h b/arch/arm/mach-k3/include/mach/am6_hardware.h index 6df7631545..45a5b31c52 100644 --- a/arch/arm/mach-k3/include/mach/am6_hardware.h +++ b/arch/arm/mach-k3/include/mach/am6_hardware.h @@ -47,4 +47,11 @@ /* MCU SCRATCHPAD usage */ #define TI_SRAM_SCRATCH_BOARD_EEPROM_START CONFIG_SYS_K3_MCU_SCRATCHPAD_BASE
+/* NAVSS Northbridge config */ +#define NAVSS0_NBSS_NB0_CFG_BASE 0x03802000 +#define NAVSS0_NBSS_NB1_CFG_BASE 0x03803000
+#define NAVSS_NBSS_PID 0x0 +#define NAVSS_NBSS_THREADMAP 0x10
#endif /* __ASM_ARCH_AM6_HARDWARE_H */
This was never merged, not even commented on (only apparently rejected in patchwork) - but it is crucial as we now found out:
prueth will quickly stall when these priorities are not applied, at least with SR1.0-based AM65x designs. And you probably know what else could go wrong. Please clarify and merge, possibly reducing the scope to SR1.0 if you can confirm that SR2.0 cannot be affected by design (I can only say this based on few practical experiments here).
If it was good for several TI SDK releases by now, at least something similar should be good for upstream as well, I believe.
Ping. We need at least some confirmation on what is actually needed. Then, if you do not like to add it to the generic path, it would be easy for us to carry it in the IOT2050 board init only - with the appropriate condition check.
Did some more experiments on SR2 silicon, and while I'm not seeing stalls without this patch there, iperf tests with prueth show high retry rates and, thus, about 10% worse throughput. So it seems to be required for newer silicon as well.
At this point, I'd really appreciate it if someone from within TI can chime in here as I expect someone must suspect something here, thanks!