On Fri, 25 Mar 2022, Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> The debugs in lower level DPLL code don't really provide any
> useful extra information AFAICS. Better just streamline the
> code and just put the necessary debugs (to identify at which
> step the modeset failed) into the higher level code. In
> addition we'll get the full state dump as well, which should
> hopefully have enough information to figure out what went wrong.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dpll.c | 75 +++++++------------
> drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 48 +++---------
> 2 files changed, 35 insertions(+), 88 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll.c b/drivers/gpu/drm/i915/display/intel_dpll.c
> index 7c6e72555b82..cbb444a2ba9d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll.c
> @@ -954,21 +954,12 @@ static int hsw_crtc_get_shared_dpll(struct intel_atomic_state *state,
> intel_atomic_get_new_crtc_state(state, crtc);
> struct intel_encoder *encoder =
> intel_get_crtc_new_encoder(state, crtc_state);
> - int ret;
>
> if (DISPLAY_VER(dev_priv) < 11 &&
> intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
> return 0;
>
> - ret = intel_reserve_shared_dplls(state, crtc, encoder);
> - if (ret) {
> - drm_dbg_kms(&dev_priv->drm,
> - "failed to find PLL for pipe %c\n",
> - pipe_name(crtc->pipe));
> - return ret;
> - }
> -
> - return 0;
> + return intel_reserve_shared_dplls(state, crtc, encoder);
> }
>
> static int dg2_crtc_compute_clock(struct intel_atomic_state *state,
> @@ -1141,11 +1132,8 @@ static int ilk_crtc_compute_clock(struct intel_atomic_state *state,
>
> if (!crtc_state->clock_set &&
> !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> - refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&dev_priv->drm,
> - "Couldn't find PLL settings for mode!\n");
> + refclk, NULL, &crtc_state->dpll))
> return -EINVAL;
> - }
>
> ilk_compute_dpll(crtc_state, &crtc_state->dpll,
> &crtc_state->dpll);
> @@ -1156,24 +1144,14 @@ static int ilk_crtc_compute_clock(struct intel_atomic_state *state,
> static int ilk_crtc_get_shared_dpll(struct intel_atomic_state *state,
> struct intel_crtc *crtc)
> {
> - struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> struct intel_crtc_state *crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> - int ret;
>
> /* CPU eDP is the only output that doesn't need a PCH PLL of its own. */
> if (!crtc_state->has_pch_encoder)
> return 0;
>
> - ret = intel_reserve_shared_dplls(state, crtc, NULL);
> - if (ret) {
> - drm_dbg_kms(&dev_priv->drm,
> - "failed to find PLL for pipe %c\n",
> - pipe_name(crtc->pipe));
> - return ret;
> - }
> -
> - return 0;
> + return intel_reserve_shared_dplls(state, crtc, NULL);
> }
>
> void vlv_compute_dpll(struct intel_crtc_state *crtc_state)
> @@ -1214,7 +1192,6 @@ void chv_compute_dpll(struct intel_crtc_state *crtc_state)
> static int chv_crtc_compute_clock(struct intel_atomic_state *state,
> struct intel_crtc *crtc)
> {
> - struct drm_i915_private *i915 = to_i915(state->base.dev);
> struct intel_crtc_state *crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> const struct intel_limit *limit = &intel_limits_chv;
> @@ -1222,10 +1199,8 @@ static int chv_crtc_compute_clock(struct intel_atomic_state *state,
>
> if (!crtc_state->clock_set &&
> !chv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> - refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&i915->drm, "Couldn't find PLL settings for mode!\n");
> + refclk, NULL, &crtc_state->dpll))
> return -EINVAL;
> - }
>
> chv_compute_dpll(crtc_state);
>
> @@ -1235,7 +1210,6 @@ static int chv_crtc_compute_clock(struct intel_atomic_state *state,
> static int vlv_crtc_compute_clock(struct intel_atomic_state *state,
> struct intel_crtc *crtc)
> {
> - struct drm_i915_private *i915 = to_i915(state->base.dev);
> struct intel_crtc_state *crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> const struct intel_limit *limit = &intel_limits_vlv;
> @@ -1244,7 +1218,6 @@ static int vlv_crtc_compute_clock(struct intel_atomic_state *state,
> if (!crtc_state->clock_set &&
> !vlv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&i915->drm, "Couldn't find PLL settings for mode!\n");
> return -EINVAL;
> }
>
> @@ -1286,11 +1259,8 @@ static int g4x_crtc_compute_clock(struct intel_atomic_state *state,
>
> if (!crtc_state->clock_set &&
> !g4x_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> - refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&dev_priv->drm,
> - "Couldn't find PLL settings for mode!\n");
> + refclk, NULL, &crtc_state->dpll))
> return -EINVAL;
> - }
>
> i9xx_compute_dpll(crtc_state, &crtc_state->dpll,
> &crtc_state->dpll);
> @@ -1322,11 +1292,8 @@ static int pnv_crtc_compute_clock(struct intel_atomic_state *state,
>
> if (!crtc_state->clock_set &&
> !pnv_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> - refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&dev_priv->drm,
> - "Couldn't find PLL settings for mode!\n");
> + refclk, NULL, &crtc_state->dpll))
> return -EINVAL;
> - }
>
> i9xx_compute_dpll(crtc_state, &crtc_state->dpll,
> &crtc_state->dpll);
> @@ -1358,11 +1325,8 @@ static int i9xx_crtc_compute_clock(struct intel_atomic_state *state,
>
> if (!crtc_state->clock_set &&
> !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> - refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&dev_priv->drm,
> - "Couldn't find PLL settings for mode!\n");
> + refclk, NULL, &crtc_state->dpll))
> return -EINVAL;
> - }
>
> i9xx_compute_dpll(crtc_state, &crtc_state->dpll,
> &crtc_state->dpll);
> @@ -1396,11 +1360,8 @@ static int i8xx_crtc_compute_clock(struct intel_atomic_state *state,
>
> if (!crtc_state->clock_set &&
> !i9xx_find_best_dpll(limit, crtc_state, crtc_state->port_clock,
> - refclk, NULL, &crtc_state->dpll)) {
> - drm_err(&dev_priv->drm,
> - "Couldn't find PLL settings for mode!\n");
> + refclk, NULL, &crtc_state->dpll))
> return -EINVAL;
> - }
>
> i8xx_compute_dpll(crtc_state, &crtc_state->dpll,
> &crtc_state->dpll);
> @@ -1453,6 +1414,7 @@ int intel_dpll_crtc_compute_clock(struct intel_atomic_state *state,
> struct drm_i915_private *i915 = to_i915(state->base.dev);
> struct intel_crtc_state *crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> + int ret;
>
> drm_WARN_ON(&i915->drm, !intel_crtc_needs_modeset(crtc_state));
>
> @@ -1462,7 +1424,14 @@ int intel_dpll_crtc_compute_clock(struct intel_atomic_state *state,
> if (!crtc_state->hw.enable)
> return 0;
>
> - return i915->dpll_funcs->crtc_compute_clock(state, crtc);
> + ret = i915->dpll_funcs->crtc_compute_clock(state, crtc);
> + if (ret) {
> + drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] Couldn't calculate DPLL settings\n",
> + crtc->base.base.id, crtc->base.name);
> + return ret;
> + }
> +
> + return 0;
> }
>
> int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
> @@ -1471,6 +1440,7 @@ int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
> struct drm_i915_private *i915 = to_i915(state->base.dev);
> struct intel_crtc_state *crtc_state =
> intel_atomic_get_new_crtc_state(state, crtc);
> + int ret;
>
> drm_WARN_ON(&i915->drm, !intel_crtc_needs_modeset(crtc_state));
>
> @@ -1483,7 +1453,14 @@ int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
> if (!i915->dpll_funcs->crtc_get_shared_dpll)
> return 0;
>
> - return i915->dpll_funcs->crtc_get_shared_dpll(state, crtc);
> + ret = i915->dpll_funcs->crtc_get_shared_dpll(state, crtc);
> + if (ret) {
> + drm_dbg_kms(&i915->drm, "[CRTC:%d:%s] Couldn't get a shared DPLL\n",
> + crtc->base.base.id, crtc->base.name);
> + return ret;
> + }
> +
> + return 0;
> }
>
> void
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> index d426724d5a2e..4c24cd563560 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> @@ -1603,10 +1603,8 @@ skl_ddi_calculate_wrpll(int clock /* in Hz */,
> break;
> }
>
> - if (!ctx.p) {
> - DRM_DEBUG_DRIVER("No valid divider found for %dHz\n", clock);
> + if (!ctx.p)
> return -EINVAL;
> - }
>
> /*
> * gcc incorrectly analyses that these can be used without being
> @@ -2145,19 +2143,14 @@ bxt_ddi_hdmi_pll_dividers(struct intel_crtc_state *crtc_state,
> struct dpll *clk_div)
> {
> struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
> - struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>
> /* Calculate HDMI div */
> /*
> * FIXME: tie the following calculation into
> * i9xx_crtc_compute_clock
> */
> - if (!bxt_find_best_dpll(crtc_state, clk_div)) {
> - drm_dbg(&i915->drm, "no PLL dividers found for clock %d pipe %c\n",
> - crtc_state->port_clock,
> - pipe_name(crtc->pipe));
> + if (!bxt_find_best_dpll(crtc_state, clk_div))
> return -EINVAL;
> - }
>
> drm_WARN_ON(&i915->drm, clk_div->m1 != 2);
>
> @@ -2879,11 +2872,8 @@ static int icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state,
>
> ret = icl_mg_pll_find_divisors(clock, is_dp, use_ssc, &dco_khz,
> pll_state, is_dkl);
> - if (ret) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Failed to find divisors for clock %d\n", clock);
> + if (ret)
> return ret;
> - }
>
> m1div = 2;
> m2div_int = dco_khz / (refclk_khz * m1div);
> @@ -2893,12 +2883,8 @@ static int icl_calc_mg_pll_state(struct intel_crtc_state *crtc_state,
> m2div_int = dco_khz / (refclk_khz * m1div);
> }
>
> - if (m2div_int > 255) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Failed to find mdiv for clock %d\n",
> - clock);
> + if (m2div_int > 255)
> return -EINVAL;
> - }
> }
> m2div_rem = dco_khz % (refclk_khz * m1div);
>
> @@ -3206,11 +3192,8 @@ static int icl_compute_combo_phy_dpll(struct intel_atomic_state *state,
> else
> ret = icl_calc_dp_combo_pll(crtc_state, &pll_params);
>
> - if (ret) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Could not calculate combo PHY PLL state.\n");
> + if (ret)
> return ret;
> - }
>
> icl_calc_dpll_state(dev_priv, &pll_params, &port_dpll->hw_state);
>
> @@ -3265,12 +3248,8 @@ static int icl_get_combo_phy_dpll(struct intel_atomic_state *state,
> port_dpll->pll = intel_find_shared_dpll(state, crtc,
> &port_dpll->hw_state,
> dpll_mask);
> - if (!port_dpll->pll) {
> - drm_dbg_kms(&dev_priv->drm,
> - "No combo PHY PLL found for [ENCODER:%d:%s]\n",
> - encoder->base.base.id, encoder->base.name);
> + if (!port_dpll->pll)
> return -EINVAL;
> - }
>
> intel_reference_shared_dpll(state, crtc,
> port_dpll->pll, &port_dpll->hw_state);
> @@ -3293,21 +3272,15 @@ static int icl_compute_tc_phy_dplls(struct intel_atomic_state *state,
>
> port_dpll = &crtc_state->icl_port_dplls[ICL_PORT_DPLL_DEFAULT];
> ret = icl_calc_tbt_pll(crtc_state, &pll_params);
> - if (ret) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Could not calculate TBT PLL state.\n");
> + if (ret)
> return ret;
> - }
>
> icl_calc_dpll_state(dev_priv, &pll_params, &port_dpll->hw_state);
>
> port_dpll = &crtc_state->icl_port_dplls[ICL_PORT_DPLL_MG_PHY];
> ret = icl_calc_mg_pll_state(crtc_state, &port_dpll->hw_state);
> - if (ret) {
> - drm_dbg_kms(&dev_priv->drm,
> - "Could not calculate MG PHY PLL state.\n");
> + if (ret)
> return ret;
> - }
>
> return 0;
> }
> @@ -3328,10 +3301,8 @@ static int icl_get_tc_phy_dplls(struct intel_atomic_state *state,
> port_dpll->pll = intel_find_shared_dpll(state, crtc,
> &port_dpll->hw_state,
> BIT(DPLL_ID_ICL_TBTPLL));
> - if (!port_dpll->pll) {
> - drm_dbg_kms(&dev_priv->drm, "No TBT-ALT PLL found\n");
> + if (!port_dpll->pll)
> return -EINVAL;
> - }
> intel_reference_shared_dpll(state, crtc,
> port_dpll->pll, &port_dpll->hw_state);
>
> @@ -3344,7 +3315,6 @@ static int icl_get_tc_phy_dplls(struct intel_atomic_state *state,
> BIT(dpll_id));
> if (!port_dpll->pll) {
> ret = -EINVAL;
> - drm_dbg_kms(&dev_priv->drm, "No MG PHY PLL found\n");
> goto err_unreference_tbt_pll;
> }
> intel_reference_shared_dpll(state, crtc,
--
Jani Nikula, Intel Open Source Graphics Center
