Hi Marek

On 4/13/22 04:49, Marek Vasut wrote:
> Enable DRAM ASR, auto self-refresh, conditionally, based on DT property
> "st,mem-enable-asr" . While ASR does save considerable amount of power
> at runtime automatically, it also causes LTDC underruns on large panels.
> Let user select whether or not ASR is required or not, generally ASR
> should be enabled on portable and battery operated devices.
> 
> Signed-off-by: Marek Vasut <ma...@denx.de>
> Cc: Patrick Delaunay <patrick.delau...@foss.st.com>
> Cc: Patrice Chotard <patrice.chot...@foss.st.com>
> ---
>  drivers/ram/stm32mp1/stm32mp1_ddr.c | 3 ++-
>  drivers/ram/stm32mp1/stm32mp1_ddr.h | 1 +
>  drivers/ram/stm32mp1/stm32mp1_ram.c | 1 +
>  3 files changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ram/stm32mp1/stm32mp1_ddr.c 
> b/drivers/ram/stm32mp1/stm32mp1_ddr.c
> index 528a171b454..fd11e02aff4 100644
> --- a/drivers/ram/stm32mp1/stm32mp1_ddr.c
> +++ b/drivers/ram/stm32mp1/stm32mp1_ddr.c
> @@ -845,7 +845,8 @@ start:
>                                config->c_reg.pwrctl);
>  
>  /* Enable auto-self-refresh, which saves a bit of power at runtime. */
> -     stm32mp1_asr_enable(priv);
> +     if (config->info.enable_asr)
> +             stm32mp1_asr_enable(priv);
>  
>       /* enable uMCTL2 AXI port 0 and 1 */
>       setbits_le32(&priv->ctl->pctrl_0, DDRCTRL_PCTRL_N_PORT_EN);
> diff --git a/drivers/ram/stm32mp1/stm32mp1_ddr.h 
> b/drivers/ram/stm32mp1/stm32mp1_ddr.h
> index 861efff92be..c74a9cea2cc 100644
> --- a/drivers/ram/stm32mp1/stm32mp1_ddr.h
> +++ b/drivers/ram/stm32mp1/stm32mp1_ddr.h
> @@ -144,6 +144,7 @@ struct stm32mp1_ddr_info {
>       const char *name;
>       u32 speed; /* in kHZ */
>       u32 size;  /* memory size in byte = col * row * width */
> +     bool enable_asr;
>  };
>  
>  struct stm32mp1_ddr_config {
> diff --git a/drivers/ram/stm32mp1/stm32mp1_ram.c 
> b/drivers/ram/stm32mp1/stm32mp1_ram.c
> index 49b1262461b..f39cfad4764 100644
> --- a/drivers/ram/stm32mp1/stm32mp1_ram.c
> +++ b/drivers/ram/stm32mp1/stm32mp1_ram.c
> @@ -122,6 +122,7 @@ static int stm32mp1_ddr_setup(struct udevice *dev)
>       config.info.speed = ofnode_read_u32_default(node, "st,mem-speed", 0);
>       config.info.size = ofnode_read_u32_default(node, "st,mem-size", 0);
>       config.info.name = ofnode_read_string(node, "st,mem-name");
> +     config.info.enable_asr = ofnode_read_bool(node, "st,mem-enable-asr");
>       if (!config.info.name) {
>               dev_dbg(dev, "no st,mem-name\n");
>               return -EINVAL;

Reviewed-by: Patrice Chotard <patrice.chot...@foss.st.com>

Thanks
Patrice

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