Hi Detlev,
On 6/12/25 3:00 AM, Detlev Casanova wrote:
> Hi Cristian,
>
> On Wednesday, 11 June 2025 17:47:49 EDT Cristian Ciocaltea wrote:
>> Since commit c871a311edf0 ("phy: rockchip: samsung-hdptx: Setup TMDS
>> char rate via phy_configure_opts_hdmi"), the workaround of passing the
>> rate from DW HDMI QP bridge driver via phy_set_bus_width() became
>> partially broken, as it cannot reliably handle mode switches anymore.
>>
>> Attempting to fix this up at PHY level would not only introduce
>> additional hacks, but it would also fail to adequately resolve the
>> display issues that are a consequence of the system CRU limitations.
>>
>> Instead, proceed with the solution already implemented for RK3588: make
>> use of the HDMI PHY PLL as a better suited DCLK source for VOP2. This
>> will not only address the aforementioned problem, but it should also
>> facilitate the proper operation of display modes up to 4K@60Hz.
>>
>> It's worth noting that anything above 4K@30Hz still requires high TMDS
>> clock ratio and scrambling support, which hasn't been mainlined yet.
>>
>> Fixes: d74b842cab08 ("arm64: dts: rockchip: Add vop for rk3576")
>> Cc: [email protected]
>> Signed-off-by: Cristian Ciocaltea <[email protected]>
>> ---
>> arch/arm64/boot/dts/rockchip/rk3576.dtsi | 6 ++++--
>> 1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/rockchip/rk3576.dtsi
>> b/arch/arm64/boot/dts/rockchip/rk3576.dtsi index
>> 6a13fe0c3513fb2ff7cd535aa70e3386c37696e4..b1ac23035dd789f0478bf10c78c74ef16
>> 7d94904 100644 --- a/arch/arm64/boot/dts/rockchip/rk3576.dtsi
>> +++ b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
>> @@ -1155,12 +1155,14 @@ vop: vop@27d00000 {
>> <&cru HCLK_VOP>,
>> <&cru DCLK_VP0>,
>> <&cru DCLK_VP1>,
>> - <&cru DCLK_VP2>;
>> + <&cru DCLK_VP2>,
>> + <&hdptxphy>;
>> clock-names = "aclk",
>> "hclk",
>> "dclk_vp0",
>> "dclk_vp1",
>> - "dclk_vp2";
>> + "dclk_vp2",
>> + "pll_hdmiphy0";
>> iommus = <&vop_mmu>;
>> power-domains = <&power RK3576_PD_VOP>;
>> rockchip,grf = <&sys_grf>;
>
> I tested this on the ROCK 4D and can confirm that:
> - New modes like 2K are now working
> - Mode changes is now correctly supported
>
> So,
> Tested-By: Detlev Casanova <[email protected]>
Thanks for taking the time to perform all these tests!
Cristian
