On Thu, 2023-03-02 at 18:10 +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Add a mechanism by which we can enable the HPD sense for
> individual encoders.
>
> This will be used during eDP probing to figure out if
> anything is actually connected. The normal intel_hpd_irq_setup()
> thing doesn't work since we only do that after probing the
> outputs, and we only enable HPD sense for encoders that were
> successfully probed.
>
> The other idea that crossed my minds was to just turn on
> HPD sense for all pins before output probing and let hpd_irq_setup()
> clean it up afterwards. But that doesn't work for BXT/GLK where
> the HPD invert information comes from the VBT child device.
> So looks like this really needs to be per-encoder.
>
> v2: Give it a better name (Jani)
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@xxxxxxxxx>
> drivers/gpu/drm/i915/i915_irq.c | 131 ++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/i915_irq.h | 2 +
> 2 files changed, 133 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 1e6a6f14a968..9d00b840727c 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2893,6 +2893,15 @@ static void ibx_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, ibx_hotplug_enables));
> }
>
> +static void ibx_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, PCH_PORT_HOTPLUG,
> + ibx_hotplug_mask(encoder->hpd_pin),
> + ibx_hotplug_enables(encoder));
> +}
> +
> static void ibx_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_irqs, enabled_irqs;
> @@ -2963,6 +2972,15 @@ static void icp_ddi_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, icp_ddi_hotplug_enables));
> }
>
> +static void icp_ddi_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, SHOTPLUG_CTL_DDI,
> + icp_ddi_hotplug_mask(encoder->hpd_pin),
> + icp_ddi_hotplug_enables(encoder));
> +}
> +
> static void icp_tc_hpd_detection_setup(struct drm_i915_private *dev_priv)
> {
> intel_uncore_rmw(&dev_priv->uncore, SHOTPLUG_CTL_TC,
> @@ -2975,6 +2993,21 @@ static void icp_tc_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, icp_tc_hotplug_enables));
> }
>
> +static void icp_tc_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, SHOTPLUG_CTL_TC,
> + icp_tc_hotplug_mask(encoder->hpd_pin),
> + icp_tc_hotplug_enables(encoder));
> +}
> +
> +static void icp_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + icp_ddi_hpd_enable_detection(encoder);
> + icp_tc_hpd_enable_detection(encoder);
> +}
> +
> static void icp_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_irqs, enabled_irqs;
> @@ -3025,6 +3058,14 @@ static void dg1_hpd_invert(struct drm_i915_private *i915)
> intel_uncore_rmw(&i915->uncore, SOUTH_CHICKEN1, 0, val);
> }
>
> +static void dg1_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + dg1_hpd_invert(i915);
> + icp_hpd_enable_detection(encoder);
> +}
> +
> static void dg1_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> dg1_hpd_invert(dev_priv);
> @@ -3043,6 +3084,15 @@ static void gen11_tc_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, gen11_hotplug_enables));
> }
>
> +static void gen11_tc_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, GEN11_TC_HOTPLUG_CTL,
> + gen11_hotplug_mask(encoder->hpd_pin),
> + gen11_hotplug_enables(encoder));
> +}
> +
> static void gen11_tbt_hpd_detection_setup(struct drm_i915_private *dev_priv)
> {
> intel_uncore_rmw(&dev_priv->uncore, GEN11_TBT_HOTPLUG_CTL,
> @@ -3055,6 +3105,26 @@ static void gen11_tbt_hpd_detection_setup(struct drm_i915_private
> *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, gen11_hotplug_enables));
> }
>
> +static void gen11_tbt_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, GEN11_TBT_HOTPLUG_CTL,
> + gen11_hotplug_mask(encoder->hpd_pin),
> + gen11_hotplug_enables(encoder));
> +}
> +
> +static void gen11_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + gen11_tc_hpd_enable_detection(encoder);
> + gen11_tbt_hpd_enable_detection(encoder);
> +
> + if (INTEL_PCH_TYPE(i915) >= PCH_ICP)
> + icp_hpd_enable_detection(encoder);
> +}
> +
> static void gen11_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_irqs, enabled_irqs;
> @@ -3140,6 +3210,26 @@ static void spt_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, spt_hotplug2_enables));
> }
>
> +static void spt_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + /* Display WA #1179 WaHardHangonHotPlug: cnp */
> + if (HAS_PCH_CNP(i915)) {
> + intel_uncore_rmw(&i915->uncore, SOUTH_CHICKEN1,
> + CHASSIS_CLK_REQ_DURATION_MASK,
> + CHASSIS_CLK_REQ_DURATION(0xf));
> + }
> +
> + intel_uncore_rmw(&i915->uncore, PCH_PORT_HOTPLUG,
> + spt_hotplug_mask(encoder->hpd_pin),
> + spt_hotplug_enables(encoder));
> +
> + intel_uncore_rmw(&i915->uncore, PCH_PORT_HOTPLUG2,
> + spt_hotplug2_mask(encoder->hpd_pin),
> + spt_hotplug2_enables(encoder));
> +}
> +
> static void spt_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_irqs, enabled_irqs;
> @@ -3189,6 +3279,17 @@ static void ilk_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, ilk_hotplug_enables));
> }
>
> +static void ilk_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, DIGITAL_PORT_HOTPLUG_CNTRL,
> + ilk_hotplug_mask(encoder->hpd_pin),
> + ilk_hotplug_enables(encoder));
> +
> + ibx_hpd_enable_detection(encoder);
> +}
> +
> static void ilk_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_irqs, enabled_irqs;
> @@ -3254,6 +3355,15 @@ static void bxt_hpd_detection_setup(struct drm_i915_private *dev_priv)
> intel_hpd_hotplug_enables(dev_priv, bxt_hotplug_enables));
> }
>
> +static void bxt_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + intel_uncore_rmw(&i915->uncore, PCH_PORT_HOTPLUG,
> + bxt_hotplug_mask(encoder->hpd_pin),
> + bxt_hotplug_enables(encoder));
> +}
> +
> static void bxt_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_irqs, enabled_irqs;
> @@ -3913,6 +4023,15 @@ static void i965_irq_postinstall(struct drm_i915_private *dev_priv)
> i915_enable_asle_pipestat(dev_priv);
> }
>
> +static void i915_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> + u32 hotplug_en = hpd_mask_i915[encoder->hpd_pin];
> +
> + /* HPD sense and interrupt enable are one and the same */
> + i915_hotplug_interrupt_update(i915, hotplug_en, hotplug_en);
> +}
> +
> static void i915_hpd_irq_setup(struct drm_i915_private *dev_priv)
> {
> u32 hotplug_en;
> @@ -3998,12 +4117,16 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
> }
>
> struct intel_hotplug_funcs {
> + /* Enable HPD sense and interrupts for all present encoders */
> void (*hpd_irq_setup)(struct drm_i915_private *i915);
> + /* Enable HPD sense for a single encoder */
> + void (*hpd_enable_detection)(struct intel_encoder *encoder);
> };
>
> #define HPD_FUNCS(platform) \
> static const struct intel_hotplug_funcs platform##_hpd_funcs = { \
> .hpd_irq_setup = platform##_hpd_irq_setup, \
> + .hpd_enable_detection = platform##_hpd_enable_detection, \
> }
>
> HPD_FUNCS(i915);
> @@ -4015,6 +4138,14 @@ HPD_FUNCS(spt);
> HPD_FUNCS(ilk);
> #undef HPD_FUNCS
>
> +void intel_hpd_enable_detection(struct intel_encoder *encoder)
> +{
> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +
> + if (i915->display.funcs.hotplug)
> + i915->display.funcs.hotplug->hpd_enable_detection(encoder);
> +}
> +
> void intel_hpd_irq_setup(struct drm_i915_private *i915)
> {
> if (i915->display_irqs_enabled && i915->display.funcs.hotplug)
> diff --git a/drivers/gpu/drm/i915/i915_irq.h b/drivers/gpu/drm/i915/i915_irq.h
> index 03ee4c8b1ed3..3717a66f97c6 100644
> --- a/drivers/gpu/drm/i915/i915_irq.h
> +++ b/drivers/gpu/drm/i915/i915_irq.h
> @@ -17,6 +17,7 @@ struct drm_device;
> struct drm_display_mode;
> struct drm_i915_private;
> struct intel_crtc;
> +struct intel_encoder;
> struct intel_uncore;
>
> void intel_irq_init(struct drm_i915_private *dev_priv);
> @@ -37,6 +38,7 @@ i915_disable_pipestat(struct drm_i915_private *dev_priv, enum pipe pipe,
> void valleyview_enable_display_irqs(struct drm_i915_private *dev_priv);
> void valleyview_disable_display_irqs(struct drm_i915_private *dev_priv);
>
> +void intel_hpd_enable_detection(struct intel_encoder *encoder);
> void intel_hpd_irq_setup(struct drm_i915_private *i915);
> void i915_hotplug_interrupt_update(struct drm_i915_private *dev_priv,
> u32 mask,
