[PATCH 4/5] drm/i915: Suppress old PLL pipe_mask checks for MG/TC/TBT PLLs

[Ville Syrjälä]

On Fri, Nov 24, 2023 at 10:27:34AM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> TC ports have both the MG/TC and TBT PLLs selected simultanously (so
> that we can switch from MG/TC to TBT as a fallback). This doesn't play
> well with the state checker that assumes that the old PLL shouldn't
> have the pipe in its pipe_mask anymore. Suppress that check for these
> PLLs to avoid spurious WARNs when you disconnect a TC port and a
> non-disabling modeset happens before actually disabling the port.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Presumably
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9816

> ---
>  drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 56 +++++++++++++------
>  drivers/gpu/drm/i915/display/intel_dpll_mgr.h |  4 ++
>  2 files changed, 42 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> index d86b02de2923..5c6c4fc50b1d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> @@ -4023,11 +4023,16 @@ static const struct intel_shared_dpll_funcs mg_pll_funcs = {
>  static const struct dpll_info icl_plls[] = {
>  	{ .name = "DPLL 0", .funcs = &combo_pll_funcs, .id = DPLL_ID_ICL_DPLL0, },
>  	{ .name = "DPLL 1", .funcs = &combo_pll_funcs, .id = DPLL_ID_ICL_DPLL1, },
> -	{ .name = "TBT PLL", .funcs = &tbt_pll_funcs, .id = DPLL_ID_ICL_TBTPLL, },
> -	{ .name = "MG PLL 1", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL1, },
> -	{ .name = "MG PLL 2", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL2, },
> -	{ .name = "MG PLL 3", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL3, },
> -	{ .name = "MG PLL 4", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL4, },
> +	{ .name = "TBT PLL", .funcs = &tbt_pll_funcs, .id = DPLL_ID_ICL_TBTPLL,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "MG PLL 1", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL1,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "MG PLL 2", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL2,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "MG PLL 3", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL3,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "MG PLL 4", .funcs = &mg_pll_funcs, .id = DPLL_ID_ICL_MGPLL4,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
>  	{}
>  };
>  
> @@ -4068,13 +4073,20 @@ static const struct intel_shared_dpll_funcs dkl_pll_funcs = {
>  static const struct dpll_info tgl_plls[] = {
>  	{ .name = "DPLL 0", .funcs = &combo_pll_funcs, .id = DPLL_ID_ICL_DPLL0, },
>  	{ .name = "DPLL 1", .funcs = &combo_pll_funcs, .id = DPLL_ID_ICL_DPLL1, },
> -	{ .name = "TBT PLL", .funcs = &tbt_pll_funcs, .id = DPLL_ID_ICL_TBTPLL, },
> -	{ .name = "TC PLL 1", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL1, },
> -	{ .name = "TC PLL 2", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL2, },
> -	{ .name = "TC PLL 3", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL3, },
> -	{ .name = "TC PLL 4", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL4, },
> -	{ .name = "TC PLL 5", .funcs = &dkl_pll_funcs, .id = DPLL_ID_TGL_MGPLL5, },
> -	{ .name = "TC PLL 6", .funcs = &dkl_pll_funcs, .id = DPLL_ID_TGL_MGPLL6, },
> +	{ .name = "TBT PLL", .funcs = &tbt_pll_funcs, .id = DPLL_ID_ICL_TBTPLL,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 1", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL1,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 2", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL2,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 3", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL3,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 4", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL4,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 5", .funcs = &dkl_pll_funcs, .id = DPLL_ID_TGL_MGPLL5,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 6", .funcs = &dkl_pll_funcs, .id = DPLL_ID_TGL_MGPLL6,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
>  	{}
>  };
>  
> @@ -4141,11 +4153,16 @@ static const struct intel_dpll_mgr adls_pll_mgr = {
>  static const struct dpll_info adlp_plls[] = {
>  	{ .name = "DPLL 0", .funcs = &combo_pll_funcs, .id = DPLL_ID_ICL_DPLL0, },
>  	{ .name = "DPLL 1", .funcs = &combo_pll_funcs, .id = DPLL_ID_ICL_DPLL1, },
> -	{ .name = "TBT PLL", .funcs = &tbt_pll_funcs, .id = DPLL_ID_ICL_TBTPLL, },
> -	{ .name = "TC PLL 1", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL1, },
> -	{ .name = "TC PLL 2", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL2, },
> -	{ .name = "TC PLL 3", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL3, },
> -	{ .name = "TC PLL 4", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL4, },
> +	{ .name = "TBT PLL", .funcs = &tbt_pll_funcs, .id = DPLL_ID_ICL_TBTPLL,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 1", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL1,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 2", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL2,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 3", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL3,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
> +	{ .name = "TC PLL 4", .funcs = &dkl_pll_funcs, .id = DPLL_ID_ICL_MGPLL4,
> +	  .flags = INTEL_DPLL_HAS_ALT_PORT_DPLL, },
>  	{}
>  };
>  
> @@ -4535,7 +4552,10 @@ void intel_shared_dpll_state_verify(struct intel_atomic_state *state,
>  		I915_STATE_WARN(i915, pll->active_mask & pipe_mask,
>  				"%s: pll active mismatch (didn't expect pipe %c in active mask (0x%x))\n",
>  				pll->info->name, pipe_name(crtc->pipe), pll->active_mask);
> -		I915_STATE_WARN(i915, pll->state.pipe_mask & pipe_mask,
> +
> +		/* TC ports have both MG/TC and TBT PLL referenced simultaneously */
> +		I915_STATE_WARN(i915, !(pll->info->flags & INTEL_DPLL_HAS_ALT_PORT_DPLL) &&
> +				pll->state.pipe_mask & pipe_mask,
>  				"%s: pll enabled crtcs mismatch (found pipe %c in enabled mask (0x%x))\n",
>  				pll->info->name, pipe_name(crtc->pipe), pll->state.pipe_mask);
>  	}
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> index 2e7ea0d8d3ff..594658087b4a 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> @@ -277,12 +277,16 @@ struct dpll_info {
>  	enum intel_display_power_domain power_domain;
>  
>  #define INTEL_DPLL_ALWAYS_ON	(1 << 0)
> +#define INTEL_DPLL_HAS_ALT_PORT_DPLL	(1 << 1)
>  	/**
>  	 * @flags:
>  	 *
>  	 * INTEL_DPLL_ALWAYS_ON
>  	 *     Inform the state checker that the DPLL is kept enabled even if
>  	 *     not in use by any CRTC.
> +	 * INTEL_DPLL_HAS_ALT_PORT_DPLL
> +	 *     Inform the state checker that the CRTC will have two port DPLLs
> +	 *     referenced simultanously (for TC->TBT fallback).
>  	 */
>  	u32 flags;
>  };
> -- 
> 2.41.0

-- 
Ville Syrjälä
Intel