[PATCH v8 7/7] clk: rockchip: implement proper GATE_LINK support

[Chad LeClair]

Sebastian,

On 3/21/24 16:45, Sebastian Reichel wrote:
> Hello Ilya,
> 
> On Thu, Mar 21, 2024 at 10:01:10PM +0300, Ilya K wrote:
>> On 2024-03-21 21:31, Sebastian Reichel wrote:
>>>
>>> Ah, that was actually not setting up the clock links at all. Sorry
>>> about that. I reworked everything again and moved all the GATE_LINK
>>> code into the separate driver now. Please give it another try.
>>>
>>> Greetings,
>>>
>>> -- Sebastian
>>
>> Applied this to my 6.8.1: https://github.com/K900/linux/tree/rk3588-test
>>
>> As far as I can tell, literally everything works now - it boots, runs, and I can read and write the flash even with ROCKCHIP_SFC=m.
>>
>> Thanks a lot for digging into this, y'all!
> 
> Great, thanks for testing. Can you check if it still works with
> ROCKCHIP_SFC=m when applying the following additional change on
> top of your tree?
> 
> diff --git a/drivers/clk/rockchip/clk-rk3588.c b/drivers/clk/rockchip/clk-rk3588.c
> index fea7e7fcc4a4..f0eb380b727c 100644
> --- a/drivers/clk/rockchip/clk-rk3588.c
> +++ b/drivers/clk/rockchip/clk-rk3588.c
> @@ -2413,7 +2413,7 @@ static struct rockchip_clk_branch rk3588_early_clk_branches[] __initdata = {
>  static struct rockchip_clk_branch rk3588_clk_branches[] = {
>         GATE_LINK(ACLK_ISP1_PRE, "aclk_isp1_pre", "aclk_isp1_root", ACLK_VI_ROOT, 0, RK3588_CLKGATE_CON(26), 6, GFLAGS),
>         GATE_LINK(HCLK_ISP1_PRE, "hclk_isp1_pre", "hclk_isp1_root", HCLK_VI_ROOT, 0, RK3588_CLKGATE_CON(26), 8, GFLAGS),
> -       GATE_LINK(HCLK_NVM, "hclk_nvm", "hclk_nvm_root", ACLK_NVM_ROOT, CLK_IS_CRITICAL, RK3588_CLKGATE_CON(31), 2, GFLAGS),
> +       GATE_LINK(HCLK_NVM, "hclk_nvm", "hclk_nvm_root", ACLK_NVM_ROOT, 0, RK3588_CLKGATE_CON(31), 2, GFLAGS),
>         GATE_LINK(ACLK_USB, "aclk_usb", "aclk_usb_root", ACLK_VO1USB_TOP_ROOT, 0, RK3588_CLKGATE_CON(42), 2, GFLAGS),
>         GATE_LINK(HCLK_USB, "hclk_usb", "hclk_usb_root", HCLK_VO1USB_TOP_ROOT, 0, RK3588_CLKGATE_CON(42), 3, GFLAGS),
>         GATE_LINK(ACLK_JPEG_DECODER_PRE, "aclk_jpeg_decoder_pre", "aclk_jpeg_decoder_root", ACLK_VDPU_ROOT, 0, RK3588_CLKGATE_CON(44), 7, GFLAGS),
> 

I can also report success with your latest tree.  It boots successfully and I
am able to interact with the SFC flash.  Looking at the clk debug info I now
see an enable value of 1 on aclk_nvm_root.

It also cleaned up the power-controller error message I had been seeing on vo0.
I just get the 'PM: genpd: Disabling unused power domains' message and no
further power errors/warnings.  So looks good.

I also tried the patch in your most recent message (removing CLK_IS_CRITICAL
from hclk_nvm).  My kernel is compiled ROCKCHIP_SFC=m. Everything still works
as expected.

So overall, looks great!  Thanks for all of your work on this!

--
Chad LeClair