Re: [PATCH] drm/i915: Pass down rc in intel_encoder->compute_config()

From: Ville Syrjälä
Date: Tue Jan 15 2019 - 08:18:13 EST

On Mon, Jan 14, 2019 at 05:29:31PM -0500, Lyude Paul wrote:
> Something that I completely missed when implementing the new MST VCPI
> atomic helpers is that with those helpers, there's technically a chance
> of us having to grab additional modeset locks in ->compute_config() and
> furthermore, that means we have the potential to hit a normal modeset
> deadlock. However, because ->compute_config() only returns a bool this
> means we can't return -EDEADLK when we need to drop locks and try again
> which means we end up just failing the atomic check permanently. Whoops.
>
> So, fix this by modifying ->compute_config() to pass down an actual
> error code instead of a bool so that the atomic check can be restarted
> on modeset deadlocks.
>
> Thanks to Ville Syrjälä for pointing this out!
>
> Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Fixes: eceae1472467 ("drm/dp_mst: Start tracking per-port VCPI allocations")
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109320
> ---
> drivers/gpu/drm/i915/icl_dsi.c | 8 +++----
> drivers/gpu/drm/i915/intel_crt.c | 34 ++++++++++++++--------------
> drivers/gpu/drm/i915/intel_ddi.c | 6 ++---
> drivers/gpu/drm/i915/intel_display.c | 11 +++++----
> drivers/gpu/drm/i915/intel_dp.c | 32 +++++++++++++-------------
> drivers/gpu/drm/i915/intel_dp_mst.c | 12 +++++-----
> drivers/gpu/drm/i915/intel_drv.h | 18 +++++++--------
> drivers/gpu/drm/i915/intel_dvo.c | 10 ++++----
> drivers/gpu/drm/i915/intel_hdmi.c | 12 +++++-----
> drivers/gpu/drm/i915/intel_lvds.c | 12 +++++-----
> drivers/gpu/drm/i915/intel_sdvo.c | 14 ++++++------
> drivers/gpu/drm/i915/intel_tv.c | 8 +++----
> drivers/gpu/drm/i915/vlv_dsi.c | 14 ++++++------
> 13 files changed, 97 insertions(+), 94 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
> index f3a5f03646ce..355b48d1c937 100644
> --- a/drivers/gpu/drm/i915/icl_dsi.c
> +++ b/drivers/gpu/drm/i915/icl_dsi.c
> @@ -1188,9 +1188,9 @@ static void gen11_dsi_get_config(struct intel_encoder *encoder,
> pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
> }
>
> -static bool gen11_dsi_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int gen11_dsi_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
> base);
> @@ -1215,7 +1215,7 @@ static bool gen11_dsi_compute_config(struct intel_encoder *encoder,
> pipe_config->clock_set = true;
> pipe_config->port_clock = intel_dsi_bitrate(intel_dsi) / 5;
>
> - return true;
> + return 0;
> }
>
> static u64 gen11_dsi_get_power_domains(struct intel_encoder *encoder,
> diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
> index 33bd2addcbdd..625794883433 100644
> --- a/drivers/gpu/drm/i915/intel_crt.c
> +++ b/drivers/gpu/drm/i915/intel_crt.c
> @@ -345,51 +345,51 @@ intel_crt_mode_valid(struct drm_connector *connector,
> return MODE_OK;
> }
>
> -static bool intel_crt_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_crt_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_display_mode *adjusted_mode =
> &pipe_config->base.adjusted_mode;
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;

Please add a newline here while at it.

> - return true;
> + return 0;
> }
>
> -static bool pch_crt_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int pch_crt_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_display_mode *adjusted_mode =
> &pipe_config->base.adjusted_mode;
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> pipe_config->has_pch_encoder = true;
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
>
> - return true;
> + return 0;
> }
>
> -static bool hsw_crt_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int hsw_crt_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> struct drm_display_mode *adjusted_mode =
> &pipe_config->base.adjusted_mode;
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> /* HSW/BDW FDI limited to 4k */
> if (adjusted_mode->crtc_hdisplay > 4096 ||
> adjusted_mode->crtc_hblank_start > 4096)
> - return false;
> + return -ENOSPC;

I'd go with -EINVAL here.

>
> pipe_config->has_pch_encoder = true;
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> @@ -398,7 +398,7 @@ static bool hsw_crt_compute_config(struct intel_encoder *encoder,
> if (HAS_PCH_LPT(dev_priv)) {
> if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) {
> DRM_DEBUG_KMS("LPT only supports 24bpp\n");
> - return false;
> + return -EINVAL;
> }
>
> pipe_config->pipe_bpp = 24;
> @@ -407,7 +407,7 @@ static bool hsw_crt_compute_config(struct intel_encoder *encoder,
> /* FDI must always be 2.7 GHz */
> pipe_config->port_clock = 135000 * 2;
>
> - return true;
> + return 0;
> }
>
> static bool intel_ironlake_crt_detect_hotplug(struct drm_connector *connector)
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 7f3cd055de50..ce44744a5f9d 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -3837,9 +3837,9 @@ intel_ddi_compute_output_type(struct intel_encoder *encoder,
> }
> }
>
> -static bool intel_ddi_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_ddi_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> enum port port = encoder->port;

Hmm. At first glance I was rather confused that you didn't change
anything here, but indeed this guy already does what we want.

> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index ee85ca84d0f7..f6324fe74b19 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -11550,10 +11550,13 @@ intel_modeset_pipe_config(struct drm_crtc *crtc,
> continue;
>
> encoder = to_intel_encoder(connector_state->best_encoder);
> -
> - if (!(encoder->compute_config(encoder, pipe_config, connector_state))) {
> - DRM_DEBUG_KMS("Encoder config failure\n");
> - return -EINVAL;
> + ret = encoder->compute_config(encoder, pipe_config,
> + connector_state);
> + if (ret < 0) {
> + if (ret != -EDEADLK)
> + DRM_DEBUG_KMS("Encoder config failure: %d\n",
> + ret);
> + return ret;
> }
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 0a3ac98a779e..9e4c2c6bb1f0 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1905,10 +1905,10 @@ static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc)
> return 0;
> }
>
> -static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state,
> - struct link_config_limits *limits)
> +static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state,
> + struct link_config_limits *limits)
> {
> struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> @@ -1917,7 +1917,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> int pipe_bpp;
>
> if (!intel_dp_supports_dsc(intel_dp, pipe_config))
> - return false;
> + return -EINVAL;
>
> dsc_max_bpc = min_t(u8, DP_DSC_MAX_SUPPORTED_BPC,
> conn_state->max_requested_bpc);
> @@ -1925,7 +1925,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, dsc_max_bpc);
> if (pipe_bpp < DP_DSC_MIN_SUPPORTED_BPC * 3) {
> DRM_DEBUG_KMS("No DSC support for less than 8bpc\n");
> - return false;
> + return -EINVAL;
> }
>
> /*
> @@ -1959,7 +1959,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> adjusted_mode->crtc_hdisplay);
> if (!dsc_max_output_bpp || !dsc_dp_slice_count) {
> DRM_DEBUG_KMS("Compressed BPP/Slice Count not supported\n");
> - return false;
> + return -EINVAL;
> }
> pipe_config->dsc_params.compressed_bpp = min_t(u16,
> dsc_max_output_bpp >> 4,
> @@ -1976,7 +1976,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> pipe_config->dsc_params.dsc_split = true;
> } else {
> DRM_DEBUG_KMS("Cannot split stream to use 2 VDSC instances\n");
> - return false;
> + return -EINVAL;
> }
> }
> if (intel_dp_compute_dsc_params(intel_dp, pipe_config) < 0) {
> @@ -1984,7 +1984,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> "Compressed BPP = %d\n",
> pipe_config->pipe_bpp,
> pipe_config->dsc_params.compressed_bpp);
> - return false;
> + return -EINVAL;

Here we can propagate the return value from
intel_dp_compute_dsc_params() upwards.

> }
> pipe_config->dsc_params.compression_enable = true;
> DRM_DEBUG_KMS("DP DSC computed with Input Bpp = %d "
> @@ -1993,7 +1993,7 @@ static bool intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
> pipe_config->dsc_params.compressed_bpp,
> pipe_config->dsc_params.slice_count);
>
> - return true;
> + return 0;
> }
>
> static bool
> @@ -2094,7 +2094,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder,
> return true;
> }

You changed intel_dp_dsc_compute_config() but didn't update the caller?
Probably best to change all the intel_dp_compute_link_config*() functions
to return an int as well for consistency.

>
> -bool
> +int
> intel_dp_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state)
> @@ -2147,20 +2147,20 @@ intel_dp_compute_config(struct intel_encoder *encoder,

Oh wow. I just noticed that a1b2278e4dfc ("drm/i915: skylake panel fitting
using shared scalers") already assumed that .compute_config() returns
an int. That might even explain some oddball scaler fails people have
seen.

> }
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> if (HAS_GMCH_DISPLAY(dev_priv) &&
> adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
> - return false;
> + return -EINVAL;
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
> - return false;
> + return -EINVAL;
>
> pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) &&
> intel_dp_supports_fec(intel_dp, pipe_config);
>
> if (!intel_dp_compute_link_config(encoder, pipe_config, conn_state))
> - return false;
> + return -ENOSPC;
>
> if (intel_conn_state->broadcast_rgb == INTEL_BROADCAST_RGB_AUTO) {
> /*
> @@ -2208,7 +2208,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>
> intel_psr_compute_config(intel_dp, pipe_config);
>
> - return true;
> + return 0;
> }
>
> void intel_dp_set_link_params(struct intel_dp *intel_dp,
> diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
> index 3f83429333c7..a19699023db1 100644
> --- a/drivers/gpu/drm/i915/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/intel_dp_mst.c
> @@ -29,9 +29,9 @@
> #include <drm/drm_crtc_helper.h>
> #include <drm/drm_edid.h>
>
> -static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
> @@ -52,7 +52,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
> DP_DPCD_QUIRK_CONSTANT_N);
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> pipe_config->has_pch_encoder = false;
> @@ -89,7 +89,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
> if (slots < 0) {
> DRM_DEBUG_KMS("failed finding vcpi slots:%d\n",
> slots);
> - return false;
> + return slots;
> }
> }
>
> @@ -107,7 +107,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
>
> intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
>
> - return true;
> + return 0;
> }
>
> static int
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 7977843ce26a..e5a436c33307 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -225,9 +225,9 @@ struct intel_encoder {
> enum intel_output_type (*compute_output_type)(struct intel_encoder *,
> struct intel_crtc_state *,
> struct drm_connector_state *);
> - bool (*compute_config)(struct intel_encoder *,
> - struct intel_crtc_state *,
> - struct drm_connector_state *);
> + int (*compute_config)(struct intel_encoder *,
> + struct intel_crtc_state *,
> + struct drm_connector_state *);
> void (*pre_pll_enable)(struct intel_encoder *,
> const struct intel_crtc_state *,
> const struct drm_connector_state *);
> @@ -1816,9 +1816,9 @@ void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp,
> void intel_dp_encoder_reset(struct drm_encoder *encoder);
> void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder);
> void intel_dp_encoder_flush_work(struct drm_encoder *encoder);
> -bool intel_dp_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state);
> +int intel_dp_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state);
> bool intel_dp_is_edp(struct intel_dp *intel_dp);
> bool intel_dp_is_port_edp(struct drm_i915_private *dev_priv, enum port port);
> enum irqreturn intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port,
> @@ -1978,9 +1978,9 @@ void intel_hdmi_init(struct drm_i915_private *dev_priv, i915_reg_t hdmi_reg,
> void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> struct intel_connector *intel_connector);
> struct intel_hdmi *enc_to_intel_hdmi(struct drm_encoder *encoder);
> -bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state);
> +int intel_hdmi_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state);
> bool intel_hdmi_handle_sink_scrambling(struct intel_encoder *encoder,
> struct drm_connector *connector,
> bool high_tmds_clock_ratio,
> diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
> index bc3c3cb57ec6..2ac488500ea5 100644
> --- a/drivers/gpu/drm/i915/intel_dvo.c
> +++ b/drivers/gpu/drm/i915/intel_dvo.c
> @@ -234,9 +234,9 @@ intel_dvo_mode_valid(struct drm_connector *connector,
> return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
> }
>
> -static bool intel_dvo_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_dvo_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
> const struct drm_display_mode *fixed_mode =
> @@ -253,10 +253,10 @@ static bool intel_dvo_compute_config(struct intel_encoder *encoder,
> intel_fixed_panel_mode(fixed_mode, adjusted_mode);
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;

Please add a newline here while at it.

> - return true;
> + return 0;
> }
>
> static void intel_dvo_pre_enable(struct intel_encoder *encoder,
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 74f4021b760c..147a367c9abb 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1704,9 +1704,9 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
> return true;
> }
>
> -bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +int intel_hdmi_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> @@ -1722,7 +1722,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> bool force_dvi = intel_conn_state->force_audio == HDMI_AUDIO_OFF_DVI;
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> pipe_config->has_hdmi_sink = !force_dvi && intel_hdmi->has_hdmi_sink;
> @@ -1753,7 +1753,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> &clock_12bpc, &clock_10bpc,
> &clock_8bpc)) {
> DRM_ERROR("Can't support YCBCR420 output\n");
> - return false;
> + return -EINVAL;
> }
> }
>

Looks like you missed the if(hdmi_port_clock_valid()) branch here.

> @@ -1822,7 +1822,7 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> }
> }
>
> - return true;
> + return 0;
> }
>
> static void
> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> index b01aacb5d73d..46a5dfd5cdf7 100644
> --- a/drivers/gpu/drm/i915/intel_lvds.c
> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> @@ -380,9 +380,9 @@ intel_lvds_mode_valid(struct drm_connector *connector,
> return MODE_OK;
> }
>
> -static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_lvds_compute_config(struct intel_encoder *intel_encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
> struct intel_lvds_encoder *lvds_encoder =
> @@ -396,7 +396,7 @@ static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
> /* Should never happen!! */
> if (INTEL_GEN(dev_priv) < 4 && intel_crtc->pipe == 0) {
> DRM_ERROR("Can't support LVDS on pipe A\n");
> - return false;
> + return -EINVAL;
> }
>
> if (lvds_encoder->a3_power == LVDS_A3_POWER_UP)
> @@ -422,7 +422,7 @@ static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
> adjusted_mode);
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> if (HAS_PCH_SPLIT(dev_priv)) {
> pipe_config->has_pch_encoder = true;
> @@ -441,7 +441,7 @@ static bool intel_lvds_compute_config(struct intel_encoder *intel_encoder,
> * user's requested refresh rate.
> */
>
> - return true;
> + return 0;
> }
>
> static enum drm_connector_status
> diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
> index 4db7aefa88f9..df2d830a7405 100644
> --- a/drivers/gpu/drm/i915/intel_sdvo.c
> +++ b/drivers/gpu/drm/i915/intel_sdvo.c
> @@ -1107,9 +1107,9 @@ static void i9xx_adjust_sdvo_tv_clock(struct intel_crtc_state *pipe_config)
> pipe_config->clock_set = true;
> }
>
> -static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_sdvo_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
> struct intel_sdvo_connector_state *intel_sdvo_state =
> @@ -1134,7 +1134,7 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
> */
> if (IS_TV(intel_sdvo_connector)) {
> if (!intel_sdvo_set_output_timings_from_mode(intel_sdvo, mode))
> - return false;
> + return -EINVAL;
>
> (void) intel_sdvo_get_preferred_input_mode(intel_sdvo,
> intel_sdvo_connector,
> @@ -1144,7 +1144,7 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
> } else if (IS_LVDS(intel_sdvo_connector)) {
> if (!intel_sdvo_set_output_timings_from_mode(intel_sdvo,
> intel_sdvo_connector->base.panel.fixed_mode))
> - return false;
> + return -EINVAL;
>
> (void) intel_sdvo_get_preferred_input_mode(intel_sdvo,
> intel_sdvo_connector,
> @@ -1153,7 +1153,7 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
> }
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> /*
> * Make the CRTC code factor in the SDVO pixel multiplier. The
> @@ -1193,7 +1193,7 @@ static bool intel_sdvo_compute_config(struct intel_encoder *encoder,
> if (intel_sdvo_connector->is_hdmi)
> adjusted_mode->picture_aspect_ratio = conn_state->picture_aspect_ratio;
>
> - return true;
> + return 0;
> }
>
> #define UPDATE_PROPERTY(input, NAME) \
> diff --git a/drivers/gpu/drm/i915/intel_tv.c b/drivers/gpu/drm/i915/intel_tv.c
> index d7a414ce2774..bd5536f0ec92 100644
> --- a/drivers/gpu/drm/i915/intel_tv.c
> +++ b/drivers/gpu/drm/i915/intel_tv.c
> @@ -869,7 +869,7 @@ intel_tv_get_config(struct intel_encoder *encoder,
> pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
> }
>
> -static bool
> +static int
> intel_tv_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state)
> @@ -879,10 +879,10 @@ intel_tv_compute_config(struct intel_encoder *encoder,
> &pipe_config->base.adjusted_mode;
>
> if (!tv_mode)
> - return false;
> + return -EINVAL;
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
> adjusted_mode->crtc_clock = tv_mode->clock;
> @@ -897,7 +897,7 @@ intel_tv_compute_config(struct intel_encoder *encoder,
> * or whether userspace is doing something stupid.
> */
>
> - return true;
> + return 0;
> }
>
> static void
> diff --git a/drivers/gpu/drm/i915/vlv_dsi.c b/drivers/gpu/drm/i915/vlv_dsi.c
> index d116fead8514..c247ce74b71a 100644
> --- a/drivers/gpu/drm/i915/vlv_dsi.c
> +++ b/drivers/gpu/drm/i915/vlv_dsi.c
> @@ -256,9 +256,9 @@ static void band_gap_reset(struct drm_i915_private *dev_priv)
> mutex_unlock(&dev_priv->sb_lock);
> }
>
> -static bool intel_dsi_compute_config(struct intel_encoder *encoder,
> - struct intel_crtc_state *pipe_config,
> - struct drm_connector_state *conn_state)
> +static int intel_dsi_compute_config(struct intel_encoder *encoder,
> + struct intel_crtc_state *pipe_config,
> + struct drm_connector_state *conn_state)
> {
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
> @@ -284,7 +284,7 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
> }
>
> if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
> - return false;
> + return -EINVAL;
>
> /* DSI uses short packets for sync events, so clear mode flags for DSI */
> adjusted_mode->flags = 0;
> @@ -302,16 +302,16 @@ static bool intel_dsi_compute_config(struct intel_encoder *encoder,
>
> ret = bxt_dsi_pll_compute(encoder, pipe_config);
> if (ret)
> - return false;
> + return -EINVAL;
> } else {
> ret = vlv_dsi_pll_compute(encoder, pipe_config);
> if (ret)
> - return false;
> + return -EINVAL;
> }
>
> pipe_config->clock_set = true;
>
> - return true;
> + return 0;
> }
>
> static bool glk_dsi_enable_io(struct intel_encoder *encoder)
> --
> 2.20.1

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