[PATCH] ram: stm32mp1: Conditionally enable ASR

[Marek Vasut]

On 4/14/22 18:48, Marek Vasut wrote:
> On 4/14/22 18:37, Patrick DELAUNAY wrote:
>> Hi Marek,
> 
> Hi,
> 
>> on ST platform the ASR/SSR/HSR request are already provided by the DDR 
>> settings with pwrctl register value
>>
>> it is managed in TF-A by
>>
>> arm-trusted-firmware/drivers/st/ddr/stm32mp1_ddr_helpers.c
> 
> Sure, I don't use ATF and I have no intention of ever using ATF on this 
> platform.
> 
>> enumstm32mp1_ddr_sr_mode ddr_read_sr_mode(void)
>> {
>> uint32_tpwrctl = mmio_read_32(stm32mp_ddrctrl_base() + DDRCTRL_PWRCTL);
>> switch(pwrctl & (DDRCTRL_PWRCTL_EN_DFI_DRAM_CLK_DISABLE |
>> DDRCTRL_PWRCTL_SELFREF_EN)) {
>> case0U:
>> returnDDR_SSR_MODE;
>> caseDDRCTRL_PWRCTL_EN_DFI_DRAM_CLK_DISABLE:
>> returnDDR_HSR_MODE;
>> caseDDRCTRL_PWRCTL_EN_DFI_DRAM_CLK_DISABLE | DDRCTRL_PWRCTL_SELFREF_EN:
>> returnDDR_ASR_MODE;
>> default:
>> returnDDR_SR_MODE_INVALID;
>> }
>> }
>>
>> no need to add an other property
> 
> This is for U-Boot, plain, stock, without any other software partaking 
> in it.

Note that this patch just reinstates the old behavior before v2022.04 
release, except it adds a DT property to enable the new behavior with 
ASR and makes it non-default.