On Thu, Mar 24, 2016 at 05:40:51PM +0530, Shubhangi Shrivastava wrote:
> This patch sets the invert bit for hpd detection for each port
> based on VBT configuration. Since each AOB can be designed to
> depend on invert bit or not, it is expected if an AOB requires
> invert bit, the user will set respective bit in VBT.
>
> v2: Separated VBT parsing from the rest of the logic. (Jani)
>
> v3: Moved setting invert bit logic to bxt_hpd_irq_setup()
> and changed its logic to avoid looping twice. (Ville)
>
> v4: Changed the logic to mask out the bits first and then
> set them to remove need of temporary variable. (Ville)
>
> v5: Moved defines to existing set of defines for the register
> Changed logic to incorporate required breaks. (Ville)
>
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@xxxxxxxxx>
> Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
> Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@xxxxxxxxx>
> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/i915_irq.c | 20 ++++++++++++++++++++
> drivers/gpu/drm/i915/i915_reg.h | 6 ++++++
> drivers/gpu/drm/i915/intel_bios.c | 32 ++++++++++++++++++++++++++++++++
> 4 files changed, 60 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 9d29ab0..86fb5cb 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3396,6 +3396,8 @@ bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
> bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin);
> bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port);
> bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, enum port *port);
> +bool intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
> + enum port port);
>
> /* intel_opregion.c */
> #ifdef CONFIG_ACPI
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a55a7cc..8fbec3e 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -3504,6 +3504,26 @@ static void bxt_hpd_irq_setup(struct drm_device *dev)
> hotplug = I915_READ(PCH_PORT_HOTPLUG);
> hotplug |= PORTC_HOTPLUG_ENABLE | PORTB_HOTPLUG_ENABLE |
> PORTA_HOTPLUG_ENABLE;
> +
> + DRM_DEBUG_KMS("Invert bit setting: hp_ctl:%x hp_port:%x\n",
> + hotplug, enabled_irqs);
> + hotplug &= ~BXT_DDI_HPD_INVERT_MASK;
> +
> + /*
> + * For BXT invert bit has to be set based on AOB design
> + * for HPD detection logic, update it based on VBT fields.
> + */
> +
> + if ((enabled_irqs & BXT_DE_PORT_HP_DDIA) &&
> + intel_bios_is_port_hpd_inverted(dev_priv, PORT_A))
> + hotplug |= BXT_DDIA_HPD_INVERT;
> + if ((enabled_irqs & BXT_DE_PORT_HP_DDIB) &&
> + intel_bios_is_port_hpd_inverted(dev_priv, PORT_B))
> + hotplug |= BXT_DDIB_HPD_INVERT;
> + if ((enabled_irqs & BXT_DE_PORT_HP_DDIC) &&
> + intel_bios_is_port_hpd_inverted(dev_priv, PORT_C))
> + hotplug |= BXT_DDIC_HPD_INVERT;
> +
> I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
> }
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index f3ba43c..73a806c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -6185,6 +6185,7 @@ enum skl_disp_power_wells {
> /* digital port hotplug */
> #define PCH_PORT_HOTPLUG _MMIO(0xc4030) /* SHOTPLUG_CTL */
> #define PORTA_HOTPLUG_ENABLE (1 << 28) /* LPT:LP+ & BXT */
> +#define BXT_DDIA_HPD_INVERT (1 << 27)
> #define PORTA_HOTPLUG_STATUS_MASK (3 << 24) /* SPT+ & BXT */
> #define PORTA_HOTPLUG_NO_DETECT (0 << 24) /* SPT+ & BXT */
> #define PORTA_HOTPLUG_SHORT_DETECT (1 << 24) /* SPT+ & BXT */
> @@ -6200,6 +6201,7 @@ enum skl_disp_power_wells {
> #define PORTD_HOTPLUG_SHORT_DETECT (1 << 16)
> #define PORTD_HOTPLUG_LONG_DETECT (2 << 16)
> #define PORTC_HOTPLUG_ENABLE (1 << 12)
> +#define BXT_DDIC_HPD_INVERT (1 << 11)
> #define PORTC_PULSE_DURATION_2ms (0 << 10) /* pre-LPT */
> #define PORTC_PULSE_DURATION_4_5ms (1 << 10) /* pre-LPT */
> #define PORTC_PULSE_DURATION_6ms (2 << 10) /* pre-LPT */
> @@ -6210,6 +6212,7 @@ enum skl_disp_power_wells {
> #define PORTC_HOTPLUG_SHORT_DETECT (1 << 8)
> #define PORTC_HOTPLUG_LONG_DETECT (2 << 8)
> #define PORTB_HOTPLUG_ENABLE (1 << 4)
> +#define BXT_DDIB_HPD_INVERT (1 << 3)
> #define PORTB_PULSE_DURATION_2ms (0 << 2) /* pre-LPT */
> #define PORTB_PULSE_DURATION_4_5ms (1 << 2) /* pre-LPT */
> #define PORTB_PULSE_DURATION_6ms (2 << 2) /* pre-LPT */
> @@ -6219,6 +6222,9 @@ enum skl_disp_power_wells {
> #define PORTB_HOTPLUG_NO_DETECT (0 << 0)
> #define PORTB_HOTPLUG_SHORT_DETECT (1 << 0)
> #define PORTB_HOTPLUG_LONG_DETECT (2 << 0)
> +#define BXT_DDI_HPD_INVERT_MASK (BXT_DDIA_HPD_INVERT | \
> + BXT_DDIB_HPD_INVERT | \
> + BXT_DDIC_HPD_INVERT)
>
> #define PCH_PORT_HOTPLUG2 _MMIO(0xc403C) /* SHOTPLUG_CTL2 SPT+ */
> #define PORTE_HOTPLUG_ENABLE (1 << 4)
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index e2f636c..e015a95 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -107,6 +107,38 @@ find_section(const void *_bdb, int section_id)
> return NULL;
> }
>
> +bool
> +intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
> + enum port port)
> +{
> + int i;
> +
> + if (WARN_ON_ONCE(!IS_BROXTON(dev_priv)))
> + return false;
> +
> + for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
> +
> + if (!dev_priv->vbt.child_dev[i].common.hpd_invert)
> + continue;
> +
> + switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
> + case DVO_PORT_DPA:
> + case DVO_PORT_HDMIA:
> + return port == PORT_A;
> + case DVO_PORT_DPB:
> + case DVO_PORT_HDMIB:
> + return port == PORT_B;
> + case DVO_PORT_DPC:
> + case DVO_PORT_HDMIC:
> + return port == PORT_C;
That doesn't actually work. Eg. if called with port==PORT_B and there's
a port A listed first in the VBT with hpd_invert==true, we'll end up
returning false always for PORT_B regardless of what VBT says we should
return for port B.
> + default:
> + break;
> + }
> + }
> +
> + return false;
> +}
> +
> static void
> fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
> const struct lvds_dvo_timing *dvo_timing)
> --
> 2.6.1
--
Ville Syrjälä
Intel OTC
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