[Intel-gfx] [PATCH 3/4] drm/i915: Use actual readout results for .get_freq()
Imre Deak
imre.deak at intel.com
Tue Nov 10 13:38:00 UTC 2020
On Tue, Nov 10, 2020 at 01:12:38AM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Currently the DPLL .get_freq() uses pll->state.hw_state which
> is not the thing we actually read out (except during driver
> load/resume). Outside of that pll->state.hw_state is just the
> thing we committed last time around. During state check we
> just read the thing into crtc_state->dpll_hw_state, so that
> is what we should use for calculating the DPLL output frequency.
>
> I think we used to do this so that the results of the readout
> were actually used, but somehow it got changed when the
> .get_freq() refactoring happened.
>
> Cc: Imre Deak <imre.deak at intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Makes sense:
Reviewed-by: Imre Deak <imre.deak at intel.com>
We do actually check if pll->state.hw_state matches the actual HW state
in verify_single_dpll_state().
> ---
> drivers/gpu/drm/i915/display/icl_dsi.c | 3 +-
> drivers/gpu/drm/i915/display/intel_ddi.c | 3 +-
> drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 78 +++++++++++--------
> drivers/gpu/drm/i915/display/intel_dpll_mgr.h | 8 +-
> 4 files changed, 54 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
> index 096652921453..769bb1b0d543 100644
> --- a/drivers/gpu/drm/i915/display/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/display/icl_dsi.c
> @@ -1496,7 +1496,8 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
>
> /* FIXME: adapt icl_ddi_clock_get() for DSI and use that? */
> pipe_config->port_clock = intel_dpll_get_freq(i915,
> - pipe_config->shared_dpll);
> + pipe_config->shared_dpll,
> + &pipe_config->dpll_hw_state);
>
> pipe_config->hw.adjusted_mode.crtc_clock = intel_dsi->pclk;
> if (intel_dsi->dual_link)
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index d4b1b73c7aab..9d80e47e9558 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1755,7 +1755,8 @@ static void intel_ddi_clock_get(struct intel_encoder *encoder,
> encoder->port);
> else
> pipe_config->port_clock =
> - intel_dpll_get_freq(dev_priv, pipe_config->shared_dpll);
> + intel_dpll_get_freq(dev_priv, pipe_config->shared_dpll,
> + &pipe_config->dpll_hw_state);
>
> ddi_dotclock_get(pipe_config);
> }
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> index 1604c20bac33..0f14c4dee02c 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> @@ -891,11 +891,12 @@ hsw_ddi_wrpll_get_dpll(struct intel_atomic_state *state,
> }
>
> static int hsw_ddi_wrpll_get_freq(struct drm_i915_private *dev_priv,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> int refclk;
> int n, p, r;
> - u32 wrpll = pll->state.hw_state.wrpll;
> + u32 wrpll = pll_state->wrpll;
>
> switch (wrpll & WRPLL_REF_MASK) {
> case WRPLL_REF_SPECIAL_HSW:
> @@ -962,7 +963,8 @@ hsw_ddi_lcpll_get_dpll(struct intel_crtc_state *crtc_state)
> }
>
> static int hsw_ddi_lcpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> int link_clock = 0;
>
> @@ -1002,11 +1004,12 @@ hsw_ddi_spll_get_dpll(struct intel_atomic_state *state,
> }
>
> static int hsw_ddi_spll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> int link_clock = 0;
>
> - switch (pll->state.hw_state.spll & SPLL_FREQ_MASK) {
> + switch (pll_state->spll & SPLL_FREQ_MASK) {
> case SPLL_FREQ_810MHz:
> link_clock = 81000;
> break;
> @@ -1577,9 +1580,9 @@ static bool skl_ddi_hdmi_pll_dividers(struct intel_crtc_state *crtc_state)
> }
>
> static int skl_ddi_wrpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> - const struct intel_dpll_hw_state *pll_state = &pll->state.hw_state;
> int ref_clock = i915->dpll.ref_clks.nssc;
> u32 p0, p1, p2, dco_freq;
>
> @@ -1688,12 +1691,12 @@ skl_ddi_dp_set_dpll_hw_state(struct intel_crtc_state *crtc_state)
> }
>
> static int skl_ddi_lcpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> int link_clock = 0;
>
> - switch ((pll->state.hw_state.ctrl1 &
> - DPLL_CTRL1_LINK_RATE_MASK(0)) >>
> + switch ((pll_state->ctrl1 & DPLL_CTRL1_LINK_RATE_MASK(0)) >>
> DPLL_CTRL1_LINK_RATE_SHIFT(0)) {
> case DPLL_CTRL1_LINK_RATE_810:
> link_clock = 81000;
> @@ -1771,16 +1774,17 @@ static bool skl_get_dpll(struct intel_atomic_state *state,
> }
>
> static int skl_ddi_pll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> /*
> * ctrl1 register is already shifted for each pll, just use 0 to get
> * the internal shift for each field
> */
> - if (pll->state.hw_state.ctrl1 & DPLL_CTRL1_HDMI_MODE(0))
> - return skl_ddi_wrpll_get_freq(i915, pll);
> + if (pll_state->ctrl1 & DPLL_CTRL1_HDMI_MODE(0))
> + return skl_ddi_wrpll_get_freq(i915, pll, pll_state);
> else
> - return skl_ddi_lcpll_get_freq(i915, pll);
> + return skl_ddi_lcpll_get_freq(i915, pll, pll_state);
> }
>
> static void skl_update_dpll_ref_clks(struct drm_i915_private *i915)
> @@ -2218,9 +2222,9 @@ bxt_ddi_hdmi_set_dpll_hw_state(struct intel_crtc_state *crtc_state)
> }
>
> static int bxt_ddi_pll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> - const struct intel_dpll_hw_state *pll_state = &pll->state.hw_state;
> struct dpll clock;
>
> clock.m1 = 2;
> @@ -2650,9 +2654,9 @@ ehl_combo_pll_div_frac_wa_needed(struct drm_i915_private *i915)
>
> static int __cnl_ddi_wrpll_get_freq(struct drm_i915_private *dev_priv,
> const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state,
> int ref_clock)
> {
> - const struct intel_dpll_hw_state *pll_state = &pll->state.hw_state;
> u32 dco_fraction;
> u32 p0, p1, p2, dco_freq;
>
> @@ -2711,9 +2715,11 @@ static int __cnl_ddi_wrpll_get_freq(struct drm_i915_private *dev_priv,
> }
>
> static int cnl_ddi_wrpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> - return __cnl_ddi_wrpll_get_freq(i915, pll, i915->dpll.ref_clks.nssc);
> + return __cnl_ddi_wrpll_get_freq(i915, pll, pll_state,
> + i915->dpll.ref_clks.nssc);
> }
>
> static bool
> @@ -2762,11 +2768,12 @@ cnl_ddi_dp_set_dpll_hw_state(struct intel_crtc_state *crtc_state)
> }
>
> static int cnl_ddi_lcpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> int link_clock = 0;
>
> - switch (pll->state.hw_state.cfgcr0 & DPLL_CFGCR0_LINK_RATE_MASK) {
> + switch (pll_state->cfgcr0 & DPLL_CFGCR0_LINK_RATE_MASK) {
> case DPLL_CFGCR0_LINK_RATE_810:
> link_clock = 81000;
> break;
> @@ -2849,12 +2856,13 @@ static bool cnl_get_dpll(struct intel_atomic_state *state,
> }
>
> static int cnl_ddi_pll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> - if (pll->state.hw_state.cfgcr0 & DPLL_CFGCR0_HDMI_MODE)
> - return cnl_ddi_wrpll_get_freq(i915, pll);
> + if (pll_state->cfgcr0 & DPLL_CFGCR0_HDMI_MODE)
> + return cnl_ddi_wrpll_get_freq(i915, pll, pll_state);
> else
> - return cnl_ddi_lcpll_get_freq(i915, pll);
> + return cnl_ddi_lcpll_get_freq(i915, pll, pll_state);
> }
>
> static void cnl_update_dpll_ref_clks(struct drm_i915_private *i915)
> @@ -3039,7 +3047,8 @@ static bool icl_calc_tbt_pll(struct intel_crtc_state *crtc_state,
> }
>
> static int icl_ddi_tbt_pll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> /*
> * The PLL outputs multiple frequencies at the same time, selection is
> @@ -3075,9 +3084,10 @@ icl_calc_wrpll(struct intel_crtc_state *crtc_state,
> }
>
> static int icl_ddi_combo_pll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> - return __cnl_ddi_wrpll_get_freq(i915, pll,
> + return __cnl_ddi_wrpll_get_freq(i915, pll, pll_state,
> icl_wrpll_ref_clock(i915));
> }
>
> @@ -3402,9 +3412,9 @@ static bool icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state,
> }
>
> static int icl_ddi_mg_pll_get_freq(struct drm_i915_private *dev_priv,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> - const struct intel_dpll_hw_state *pll_state = &pll->state.hw_state;
> u32 m1, m2_int, m2_frac, div1, div2, ref_clock;
> u64 tmp;
>
> @@ -4515,16 +4525,18 @@ void intel_update_active_dpll(struct intel_atomic_state *state,
> * intel_dpll_get_freq - calculate the DPLL's output frequency
> * @i915: i915 device
> * @pll: DPLL for which to calculate the output frequency
> + * @pll_state: DPLL state from which to calculate the output frequency
> *
> - * Return the output frequency corresponding to @pll's current state.
> + * Return the output frequency corresponding to @pll's passed in @pll_state.
> */
> int intel_dpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll)
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state)
> {
> if (drm_WARN_ON(&i915->drm, !pll->info->funcs->get_freq))
> return 0;
>
> - return pll->info->funcs->get_freq(i915, pll);
> + return pll->info->funcs->get_freq(i915, pll, pll_state);
> }
>
> /**
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> index 4357f92eafd6..2eb7618ef957 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.h
> @@ -300,10 +300,11 @@ struct intel_shared_dpll_funcs {
> * @get_freq:
> *
> * Hook for calculating the pll's output frequency based on its
> - * current state.
> + * passed in state.
> */
> int (*get_freq)(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll);
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state);
> };
>
> /**
> @@ -399,7 +400,8 @@ void intel_update_active_dpll(struct intel_atomic_state *state,
> struct intel_crtc *crtc,
> struct intel_encoder *encoder);
> int intel_dpll_get_freq(struct drm_i915_private *i915,
> - const struct intel_shared_dpll *pll);
> + const struct intel_shared_dpll *pll,
> + const struct intel_dpll_hw_state *pll_state);
> bool intel_dpll_get_hw_state(struct drm_i915_private *i915,
> struct intel_shared_dpll *pll,
> struct intel_dpll_hw_state *hw_state);
> --
> 2.26.2
>
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