[PATCH v3 1/3] vop2: Add clock resets support

[Heiko Stübner]

Hi Detlev,

Am Freitag, 8. November 2024, 19:50:39 CET schrieb Detlev Casanova:
> At the end of initialization, each VP clock needs to be reset before
> they can be used.
> 
> Failing to do so can put the VOP in an undefined state where the
> generated HDMI signal is either lost or not matching the selected mode.
> 
> This issue can be reproduced by switching modes multiple times.
> Depending on the setup, after about 10 mode switches, the signal will be
> lost and the value in register 0x890 (VSYNCWIDTH + VFRONT) will take the value
> `0x0000018c`.
> That makes VSYNCWIDTH=0, which is wrong.
> 
> Adding the clock resets after the VOP configuration fixes the issue.
> 
> Signed-off-by: Detlev Casanova <detlev.casanova at collabora.com>

patch subject should be "drm/rockchip: vop2: ...." please


>  static void vop2_crtc_atomic_enable(struct drm_crtc *crtc,
>  				    struct drm_atomic_state *state)
>  {
> @@ -2057,6 +2079,8 @@ static void vop2_crtc_atomic_enable(struct drm_crtc *crtc,
>  
>  	vop2_vp_write(vp, RK3568_VP_DSP_CTRL, dsp_ctrl);
>  
> +	vop2_clk_reset(vp);
> +
>  	drm_crtc_vblank_on(crtc);
>  
>  	vop2_unlock(vop2);

this conflicts with the merge gamma lut support, can you please rebase on
top of drm-misc-next? Or alternatively just tell me if it should be

	vop2_vp_write(vp, RK3568_VP_DSP_CTRL, dsp_ctrl);

+	vop2_clk_reset(vp);
+
	vop2_crtc_atomic_try_set_gamma(vop2, vp, crtc, crtc_state);

	drm_crtc_vblank_on(crtc);

----- or ----
	vop2_vp_write(vp, RK3568_VP_DSP_CTRL, dsp_ctrl);

	vop2_crtc_atomic_try_set_gamma(vop2, vp, crtc, crtc_state);

+	vop2_clk_reset(vp);
+
	drm_crtc_vblank_on(crtc);


Thanks a lot
Heiko