[PATCH V2 4/4] board: rockchip: Enable PD_VO before driver access

[Chris Morgan]

On Mon, Sep 23, 2024 at 01:24:34PM +0200, Quentin Schulz wrote:
> Hi Chris,
> 
> On 9/19/24 4:00 PM, Chris Morgan wrote:
> > From: Chris Morgan <macromorgan at hotmail.com>
> > 
> > Enable the PD_VO power domain before driver access on the rk3568 SoC.
> > 
> > Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
> > ---
> >   arch/arm/mach-rockchip/rk3568/rk3568.c | 6 ++++++
> >   1 file changed, 6 insertions(+)
> > 
> > diff --git a/arch/arm/mach-rockchip/rk3568/rk3568.c b/arch/arm/mach-rockchip/rk3568/rk3568.c
> > index 1b3e40074e3..d5742b68d68 100644
> > --- a/arch/arm/mach-rockchip/rk3568/rk3568.c
> > +++ b/arch/arm/mach-rockchip/rk3568/rk3568.c
> > @@ -26,6 +26,8 @@
> >   #define PMU_BASE_ADDR		0xfdd90000
> >   #define PMU_NOC_AUTO_CON0	(0x70)
> >   #define PMU_NOC_AUTO_CON1	(0x74)
> > +#define PMU_PWR_GATE_SFTCON	(0xa0)
> > +#define PMU_PD_VO_DWN_ENA	BIT(7)
> >   #define EDP_PHY_GRF_BASE	0xfdcb0000
> >   #define EDP_PHY_GRF_CON0	(EDP_PHY_GRF_BASE + 0x00)
> >   #define EDP_PHY_GRF_CON10	(EDP_PHY_GRF_BASE + 0x28)
> > @@ -130,6 +132,10 @@ int arch_cpu_init(void)
> >   	writel(0x3f3f0707, GRF_BASE + GRF_GPIO1C_DS_1);
> >   	writel(0x3f3f0707, GRF_BASE + GRF_GPIO1C_DS_2);
> >   	writel(0x3f3f0707, GRF_BASE + GRF_GPIO1C_DS_3);
> > +
> > +	/* Enable VO power domain for display */
> > +	writel((PMU_PD_VO_DWN_ENA << 16),
> > +	       PMU_BASE_ADDR + PMU_PWR_GATE_SFTCON);
> 
> Maybe we want to guard this with a symbol for video stuff in U-Boot? I
> assume Linux is capable of handling this just fine without U-Boot's
> intervention?
> 
> At the very least have #if CONFIG_IS_ENABLED(VIDEO) ?
> 
> What do you think?

I'm game if you are. To me this just brings back the default behavior
of the binary A-TF from Rockchip where the PD_VO was enabled, but if
we want to guard this I'm okay.

> 
> Cheers,
> Quentin

Thank you,
Chris