On Tue, 2013-02-19 at 13:31 -0800, Jesse Barnes wrote:
> From: Chris Wilson <chris at chris-wilson.co.uk>
>
> Read the current hardware state to retrieve the active mode and populate
> our CRTC config if that mode matches our presumptions.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 +
> drivers/gpu/drm/i915/intel_crt.c | 27 +++++++-
> drivers/gpu/drm/i915/intel_display.c | 119 ++++++++++++++++++++++++++--------
> drivers/gpu/drm/i915/intel_dp.c | 22 +++++++
> drivers/gpu/drm/i915/intel_drv.h | 7 +-
> drivers/gpu/drm/i915/intel_dvo.c | 36 ++++++----
> drivers/gpu/drm/i915/intel_hdmi.c | 22 +++++++
> drivers/gpu/drm/i915/intel_lvds.c | 27 +++++++-
> drivers/gpu/drm/i915/intel_sdvo.c | 23 +++++++
> 9 files changed, 242 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 30cf7e6..8473db4 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -283,6 +283,8 @@ struct drm_i915_display_funcs {
> void (*update_linetime_wm)(struct drm_device *dev, int pipe,
> struct drm_display_mode *mode);
> void (*modeset_global_resources)(struct drm_device *dev);
> + bool (*crtc_get_mode)(struct drm_crtc *crtc,
> + struct drm_display_mode *mode);
> int (*crtc_mode_set)(struct drm_crtc *crtc,
> struct drm_display_mode *mode,
> struct drm_display_mode *adjusted_mode,
> diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
> index cfc9687..f1d68e8 100644
> --- a/drivers/gpu/drm/i915/intel_crt.c
> +++ b/drivers/gpu/drm/i915/intel_crt.c
> @@ -81,6 +81,27 @@ static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
> return true;
> }
>
> +static unsigned intel_crt_get_mode_flags(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> + struct intel_crt *crt = intel_encoder_to_crt(encoder);
> + u32 tmp, flags = 0;
> +
> + tmp = I915_READ(crt->adpa_reg);
> +
> + if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PHSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NHSYNC;
> +
> + if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PVSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NVSYNC;
> +
> + return flags;
> +}
> +
> static void intel_disable_crt(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> @@ -777,10 +798,12 @@ void intel_crt_init(struct drm_device *dev)
>
> crt->base.disable = intel_disable_crt;
> crt->base.enable = intel_enable_crt;
> - if (HAS_DDI(dev))
> + if (HAS_DDI(dev)) {
> crt->base.get_hw_state = intel_ddi_get_hw_state;
> - else
> + } else {
> crt->base.get_hw_state = intel_crt_get_hw_state;
> + crt->base.get_mode_flags = intel_crt_get_mode_flags;
> + }
> intel_connector->get_hw_state = intel_connector_get_hw_state;
>
> drm_encoder_helper_add(&crt->base.base, &crt_encoder_funcs);
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 9793e66..e19b637 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6618,11 +6618,12 @@ void intel_release_load_detect_pipe(struct drm_connector *connector,
> }
>
> /* Returns the clock of the currently programmed mode of the given pipe. */
> -static int intel_crtc_clock_get(struct drm_device *dev, struct drm_crtc *crtc)
> +static int i9xx_crtc_clock_get(struct drm_crtc *crtc)
> {
> + struct drm_device *dev = crtc->dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - int pipe = intel_crtc->pipe;
> + enum pipe pipe = intel_crtc->pipe;
> u32 dpll = I915_READ(DPLL(pipe));
> u32 fp;
> intel_clock_t clock;
> @@ -6705,35 +6706,84 @@ static int intel_crtc_clock_get(struct drm_device *dev, struct drm_crtc *crtc)
> }
>
> /** Returns the currently programmed mode of the given pipe. */
> -struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
> - struct drm_crtc *crtc)
> +static bool i9xx_crtc_get_mode(struct drm_crtc *crtc,
> + struct drm_display_mode *mode)
> {
> - struct drm_i915_private *dev_priv = dev->dev_private;
> + struct drm_i915_private *dev_priv = crtc->dev->dev_private;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
> - struct drm_display_mode *mode;
> - int htot = I915_READ(HTOTAL(cpu_transcoder));
> - int hsync = I915_READ(HSYNC(cpu_transcoder));
> - int vtot = I915_READ(VTOTAL(cpu_transcoder));
> - int vsync = I915_READ(VSYNC(cpu_transcoder));
> + u32 tmp;
>
> - mode = kzalloc(sizeof(*mode), GFP_KERNEL);
> - if (!mode)
> - return NULL;
> + memset(mode, 0, sizeof(*mode));
> +
> + tmp = I915_READ(HTOTAL(cpu_transcoder));
> + mode->hdisplay = (tmp & 0xffff) + 1;
> + mode->htotal = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + tmp = I915_READ(HSYNC(cpu_transcoder));
> + mode->hsync_start = (tmp & 0xffff) + 1;
> + mode->hsync_end = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + tmp = I915_READ(VTOTAL(cpu_transcoder));
> + mode->vdisplay = (tmp & 0xffff) + 1;
> + mode->vtotal = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + tmp = I915_READ(VSYNC(cpu_transcoder));
> + mode->vsync_start = (tmp & 0xffff) + 1;
> + mode->vsync_end = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + mode->clock = i9xx_crtc_clock_get(crtc);
> +
> + drm_mode_set_name(mode);
> +
> + return true;
> +}
> +
> +static bool ironlake_crtc_get_mode(struct drm_crtc *crtc,
> + struct drm_display_mode *mode)
> +{
> + struct drm_i915_private *dev_priv = crtc->dev->dev_private;
> + struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> + enum transcoder cpu_transcoder = intel_crtc->cpu_transcoder;
> + u32 tmp;
> +
> + memset(mode, 0, sizeof(*mode));
> +
> + tmp = I915_READ(HTOTAL(cpu_transcoder));
> + mode->hdisplay = (tmp & 0xffff) + 1;
> + mode->htotal = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + tmp = I915_READ(HSYNC(cpu_transcoder));
> + mode->hsync_start = (tmp & 0xffff) + 1;
> + mode->hsync_end = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + tmp = I915_READ(VTOTAL(cpu_transcoder));
> + mode->vdisplay = (tmp & 0xffff) + 1;
> + mode->vtotal = ((tmp & 0xffff0000) >> 16) + 1;
>
> - mode->clock = intel_crtc_clock_get(dev, crtc);
> - mode->hdisplay = (htot & 0xffff) + 1;
> - mode->htotal = ((htot & 0xffff0000) >> 16) + 1;
> - mode->hsync_start = (hsync & 0xffff) + 1;
> - mode->hsync_end = ((hsync & 0xffff0000) >> 16) + 1;
> - mode->vdisplay = (vtot & 0xffff) + 1;
> - mode->vtotal = ((vtot & 0xffff0000) >> 16) + 1;
> - mode->vsync_start = (vsync & 0xffff) + 1;
> - mode->vsync_end = ((vsync & 0xffff0000) >> 16) + 1;
> + tmp = I915_READ(VSYNC(cpu_transcoder));
> + mode->vsync_start = (tmp & 0xffff) + 1;
> + mode->vsync_end = ((tmp & 0xffff0000) >> 16) + 1;
> +
> + //mode->clock = i9xx_crtc_clock_get(crtc);
> + //mode->clock = 69300;
>
> drm_mode_set_name(mode);
>
> - return mode;
> + return false; /* XXX mode->clock unset */
> +}
> +
> +static __maybe_unused bool no_crtc_get_mode(struct drm_crtc *crtc,
> + struct drm_display_mode *mode)
> +{
> + return false;
> +}
> +
> +bool intel_crtc_get_mode(struct drm_crtc *crtc,
> + struct drm_display_mode *mode)
> +{
> + struct drm_i915_private *dev_priv = crtc->dev->dev_private;
> + return dev_priv->display.crtc_get_mode(crtc, mode);
> }
>
> static void intel_increase_pllclock(struct drm_crtc *crtc)
> @@ -8515,20 +8565,25 @@ static void intel_init_display(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
>
> + dev_priv->display.crtc_get_mode = no_crtc_get_mode;
> +
> /* We always want a DPMS function */
> if (HAS_DDI(dev)) {
> + dev_priv->display.crtc_get_mode = ironlake_crtc_get_mode;
> dev_priv->display.crtc_mode_set = haswell_crtc_mode_set;
> dev_priv->display.crtc_enable = haswell_crtc_enable;
> dev_priv->display.crtc_disable = haswell_crtc_disable;
> dev_priv->display.off = haswell_crtc_off;
> dev_priv->display.update_plane = ironlake_update_plane;
> } else if (HAS_PCH_SPLIT(dev)) {
> + dev_priv->display.crtc_get_mode = ironlake_crtc_get_mode;
> dev_priv->display.crtc_mode_set = ironlake_crtc_mode_set;
> dev_priv->display.crtc_enable = ironlake_crtc_enable;
> dev_priv->display.crtc_disable = ironlake_crtc_disable;
> dev_priv->display.off = ironlake_crtc_off;
> dev_priv->display.update_plane = ironlake_update_plane;
> } else {
> + dev_priv->display.crtc_get_mode = i9xx_crtc_get_mode;
> dev_priv->display.crtc_mode_set = i9xx_crtc_mode_set;
> dev_priv->display.crtc_enable = i9xx_crtc_enable;
> dev_priv->display.crtc_disable = i9xx_crtc_disable;
> @@ -9068,6 +9123,14 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
> DRM_DEBUG_KMS("[CRTC:%d] hw state readout: %s\n",
> crtc->base.base.id,
> crtc->active ? "enabled" : "disabled");
> +
> +
> + if (crtc->base.enabled)
> + crtc->mode_valid = intel_crtc_get_mode(&crtc->base, &crtc->base.mode);
> + if (crtc->mode_valid) {
> + DRM_DEBUG_KMS("found active mode: ");
> + drm_mode_debug_printmodeline(&crtc->base.mode);
> + }
> }
>
> if (HAS_DDI(dev))
> @@ -9075,12 +9138,14 @@ void intel_modeset_setup_hw_state(struct drm_device *dev,
>
> list_for_each_entry(encoder, &dev->mode_config.encoder_list,
> base.head) {
> - pipe = 0;
> + pipe = -1;
>
> if (encoder->get_hw_state(encoder, &pipe)) {
> - encoder->base.crtc =
> - dev_priv->pipe_to_crtc_mapping[pipe];
> - } else {
> + crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
get_hw_state() can return true and still leave pipe at -1, causing an
invalid access here.
> + if (crtc->mode_valid && encoder->get_mode_flags)
> + crtc->base.mode.flags |= encoder->get_mode_flags(encoder);
> + encoder->base.crtc = &crtc->base;
> + } else
> encoder->base.crtc = NULL;
> }
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 7b8bfe8..e84d4dd 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1411,6 +1411,27 @@ static bool intel_dp_get_hw_state(struct intel_encoder *encoder,
> return true;
> }
>
> +static unsigned intel_dp_get_mode_flags(struct intel_encoder *encoder)
> +{
> + struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> + struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> + u32 tmp, flags = 0;
> +
> + tmp = I915_READ(intel_dp->output_reg);
> +
> + if (tmp & DP_SYNC_HS_HIGH)
> + flags |= DRM_MODE_FLAG_PHSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NHSYNC;
> +
> + if (tmp & DP_SYNC_VS_HIGH)
> + flags |= DRM_MODE_FLAG_PVSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NVSYNC;
> +
> + return flags;
> +}
> +
> static void intel_disable_dp(struct intel_encoder *encoder)
> {
> struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> @@ -2966,6 +2987,7 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
> intel_encoder->disable = intel_disable_dp;
> intel_encoder->post_disable = intel_post_disable_dp;
> intel_encoder->get_hw_state = intel_dp_get_hw_state;
> + intel_encoder->get_mode_flags = intel_dp_get_mode_flags;
>
> intel_dig_port->port = port;
> intel_dig_port->dp.output_reg = output_reg;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 9cf794f..de8928b 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -176,6 +176,9 @@ struct intel_encoder {
> * the encoder is active. If the encoder is enabled it also set the pipe
> * it is connected to in the pipe parameter. */
> bool (*get_hw_state)(struct intel_encoder *, enum pipe *pipe);
> + /* Reconstructs the equivalent mode flags for the current hardware
> + * state. */
> + unsigned (*get_mode_flags)(struct intel_encoder *);
> int crtc_mask;
> };
>
> @@ -581,8 +584,8 @@ extern void intel_connector_attach_encoder(struct intel_connector *connector,
> struct intel_encoder *encoder);
> extern struct drm_encoder *intel_best_encoder(struct drm_connector *connector);
>
> -extern struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
> - struct drm_crtc *crtc);
> +extern bool intel_crtc_get_mode(struct drm_crtc *crtc,
> + struct drm_display_mode *mode);
> int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
> struct drm_file *file_priv);
> extern enum transcoder
> diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
> index 15da995..46b549e 100644
> --- a/drivers/gpu/drm/i915/intel_dvo.c
> +++ b/drivers/gpu/drm/i915/intel_dvo.c
> @@ -129,6 +129,22 @@ static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
> return true;
> }
>
> +static unsigned
> +intel_dvo_get_mode_flags(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> + struct intel_dvo *intel_dvo = enc_to_intel_dvo(&encoder->base);
> + u32 tmp, flags = 0;
> +
> + tmp = I915_READ(intel_dvo->dev.dvo_reg);
> + if (tmp & DVO_HSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PHSYNC;
> + if (tmp & DVO_VSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PVSYNC;
> +
> + return flags;
> +}
> +
> static void intel_disable_dvo(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> @@ -390,29 +406,26 @@ intel_dvo_get_current_mode(struct drm_connector *connector)
> struct drm_i915_private *dev_priv = dev->dev_private;
> struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
> uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
> - struct drm_display_mode *mode = NULL;
> + struct drm_display_mode *fixed_mode = NULL;
>
> /* If the DVO port is active, that'll be the LVDS, so we can pull out
> * its timings to get how the BIOS set up the panel.
> */
> if (dvo_val & DVO_ENABLE) {
> + struct drm_display_mode mode;
> struct drm_crtc *crtc;
> int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
>
> crtc = intel_get_crtc_for_pipe(dev, pipe);
> - if (crtc) {
> - mode = intel_crtc_mode_get(dev, crtc);
> - if (mode) {
> - mode->type |= DRM_MODE_TYPE_PREFERRED;
> - if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
> - mode->flags |= DRM_MODE_FLAG_PHSYNC;
> - if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
> - mode->flags |= DRM_MODE_FLAG_PVSYNC;
> - }
> + if (intel_crtc_get_mode(crtc, &mode))
> + fixed_mode = drm_mode_duplicate(dev, &mode);
> + if (fixed_mode) {
> + fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
> + fixed_mode->flags = intel_dvo_get_mode_flags(&intel_dvo->base);
> }
> }
>
> - return mode;
> + return fixed_mode;
> }
>
> void intel_dvo_init(struct drm_device *dev)
> @@ -441,6 +454,7 @@ void intel_dvo_init(struct drm_device *dev)
> intel_encoder->disable = intel_disable_dvo;
> intel_encoder->enable = intel_enable_dvo;
> intel_encoder->get_hw_state = intel_dvo_get_hw_state;
> + intel_encoder->get_mode_flags = intel_dvo_get_mode_flags;
> intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;
>
> /* Now, try to find a controller */
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 5a6138c..005b9f9 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -656,6 +656,27 @@ static bool intel_hdmi_get_hw_state(struct intel_encoder *encoder,
> return true;
> }
>
> +static unsigned intel_hdmi_get_mode_flags(struct intel_encoder *encoder)
> +{
> + struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
> + struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> + u32 tmp, flags = 0;
> +
> + tmp = I915_READ(intel_hdmi->sdvox_reg);
> +
> + if (tmp & SDVO_HSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PHSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NHSYNC;
> +
> + if (tmp & SDVO_VSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PVSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NVSYNC;
> +
> + return flags;
> +}
> +
> static void intel_enable_hdmi(struct intel_encoder *encoder)
> {
> struct drm_device *dev = encoder->base.dev;
> @@ -1102,6 +1123,7 @@ void intel_hdmi_init(struct drm_device *dev, int sdvox_reg, enum port port)
> intel_encoder->enable = intel_enable_hdmi;
> intel_encoder->disable = intel_disable_hdmi;
> intel_encoder->get_hw_state = intel_hdmi_get_hw_state;
> + intel_encoder->get_mode_flags = intel_hdmi_get_mode_flags;
>
> intel_encoder->type = INTEL_OUTPUT_HDMI;
> intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> index c7154bf..400afa4 100644
> --- a/drivers/gpu/drm/i915/intel_lvds.c
> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> @@ -88,6 +88,26 @@ static bool intel_lvds_get_hw_state(struct intel_encoder *encoder,
> return true;
> }
>
> +static unsigned intel_lvds_get_mode_flags(struct intel_encoder *encoder)
> +{
> + struct drm_device *dev = encoder->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + u32 lvds_reg, tmp, flags = 0;
> +
> + if (HAS_PCH_SPLIT(dev))
> + lvds_reg = PCH_LVDS;
> + else
> + lvds_reg = LVDS;
> +
> + tmp = I915_READ(lvds_reg);
> + if (tmp & LVDS_HSYNC_POLARITY)
> + flags |= DRM_MODE_FLAG_NHSYNC;
> + if (tmp & LVDS_VSYNC_POLARITY)
> + flags |= DRM_MODE_FLAG_NVSYNC;
> +
> + return flags;
> +}
> +
> /* The LVDS pin pair needs to be on before the DPLLs are enabled.
> * This is an exception to the general rule that mode_set doesn't turn
> * things on.
> @@ -1105,6 +1125,7 @@ bool intel_lvds_init(struct drm_device *dev)
> intel_encoder->pre_pll_enable = intel_pre_pll_enable_lvds;
> intel_encoder->disable = intel_disable_lvds;
> intel_encoder->get_hw_state = intel_lvds_get_hw_state;
> + intel_encoder->get_mode_flags = intel_lvds_get_mode_flags;
> intel_connector->get_hw_state = intel_connector_get_hw_state;
>
> intel_connector_attach_encoder(intel_connector, intel_encoder);
> @@ -1216,11 +1237,15 @@ bool intel_lvds_init(struct drm_device *dev)
> crtc = intel_get_crtc_for_pipe(dev, pipe);
>
> if (crtc && (lvds & LVDS_PORT_EN)) {
> - fixed_mode = intel_crtc_mode_get(dev, crtc);
> + struct drm_display_mode mode;
> +
> + if (intel_crtc_get_mode(crtc, &mode))
> + fixed_mode = drm_mode_duplicate(dev, &mode);
> if (fixed_mode) {
> DRM_DEBUG_KMS("using current (BIOS) mode: ");
> drm_mode_debug_printmodeline(fixed_mode);
> fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
> + fixed_mode->flags = intel_lvds_get_mode_flags(intel_encoder);
> goto out;
> }
> }
> diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
> index f01063a..918c269 100644
> --- a/drivers/gpu/drm/i915/intel_sdvo.c
> +++ b/drivers/gpu/drm/i915/intel_sdvo.c
> @@ -1250,6 +1250,27 @@ static bool intel_sdvo_get_hw_state(struct intel_encoder *encoder,
> return true;
> }
>
> +static unsigned intel_sdvo_get_mode_flags(struct intel_encoder *encoder)
> +{
> + struct intel_sdvo *intel_sdvo = to_intel_sdvo(&encoder->base);
> + struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> + u32 tmp, flags = 0;
> +
> + tmp = I915_READ(intel_sdvo->sdvo_reg);
> +
> + if (tmp & SDVO_HSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PHSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NHSYNC;
> +
> + if (tmp & SDVO_VSYNC_ACTIVE_HIGH)
> + flags |= DRM_MODE_FLAG_PVSYNC;
> + else
> + flags |= DRM_MODE_FLAG_NVSYNC;
> +
> + return flags;
> +}
> +
> static void intel_disable_sdvo(struct intel_encoder *encoder)
> {
> struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
> @@ -2785,6 +2806,8 @@ bool intel_sdvo_init(struct drm_device *dev, uint32_t sdvo_reg, bool is_sdvob)
> intel_encoder->disable = intel_disable_sdvo;
> intel_encoder->enable = intel_enable_sdvo;
> intel_encoder->get_hw_state = intel_sdvo_get_hw_state;
> + if (INTEL_INFO(dev)->gen >= 4)
> + intel_encoder->get_mode_flags = intel_sdvo_get_mode_flags;
>
> /* In default case sdvo lvds is false */
> if (!intel_sdvo_get_capabilities(intel_sdvo, &intel_sdvo->caps))
