On Thu, Feb 25, 2016 at 03:27:26PM +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)
>
> Signed-off-by: Sivakumar Thulasimani <[email protected]>
> Signed-off-by: Durgadoss R <[email protected]>
> Signed-off-by: Shubhangi Shrivastava <[email protected]>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/i915_irq.c | 22 +++++++++++++++++++-
> drivers/gpu/drm/i915/i915_reg.h | 8 ++++++++
> drivers/gpu/drm/i915/intel_bios.c | 42
> +++++++++++++++++++++++++++++++++++++++
> 4 files changed, 72 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 8216665..457f175 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3393,6 +3393,7 @@ extern void intel_i2c_reset(struct drm_device *dev);
> /* intel_bios.c */
> int intel_bios_init(struct drm_i915_private *dev_priv);
> bool intel_bios_is_valid_vbt(const void *buf, size_t size);
> +bool intel_bios_is_port_hpd_inverted(struct drm_device *dev, 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 25a8937..525da56 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -36,6 +36,7 @@
> #include "i915_drv.h"
> #include "i915_trace.h"
> #include "intel_drv.h"
> +#include "intel_bios.h"
>
> /**
> * DOC: interrupt handling
> @@ -3484,6 +3485,7 @@ static void bxt_hpd_irq_setup(struct drm_device *dev)
> {
> struct drm_i915_private *dev_priv = dev->dev_private;
> u32 hotplug_irqs, hotplug, enabled_irqs;
> + int val = 0;
u32
or if you change the logic below to mask out the bits first and then set
them as needed, then you wouldn't need another temporary variable.
>
> enabled_irqs = intel_hpd_enabled_irqs(dev, hpd_bxt);
> hotplug_irqs = BXT_DE_PORT_HOTPLUG_MASK;
> @@ -3493,7 +3495,25 @@ 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;
> - I915_WRITE(PCH_PORT_HOTPLUG, hotplug);
> +
> + /*
> + * 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, PORT_A))
&& usually goes on the previous line, and indentation should be so that
the things line up after the opening '('.
> + val |= BXT_DDIA_HPD_INVERT;
> + if ((enabled_irqs & BXT_DE_PORT_HP_DDIB)
> + && intel_bios_is_port_hpd_inverted(dev, PORT_B))
> + val |= BXT_DDIB_HPD_INVERT;
> + if ((enabled_irqs & BXT_DE_PORT_HP_DDIC)
> + && intel_bios_is_port_hpd_inverted(dev, PORT_C))
> + val |= BXT_DDIC_HPD_INVERT;
> +
> + DRM_DEBUG_KMS("Invert bit setting: hp_ctl:%x hp_port:%x val:%x\n",
> + hotplug, enabled_irqs, val);
> + hotplug &= ~BXT_DDI_HPD_INVERT_MASK;
> + I915_WRITE(PCH_PORT_HOTPLUG, hotplug | val);
> }
>
> static void ibx_irq_postinstall(struct drm_device *dev)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 6732fc1..9ed42bb 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5940,6 +5940,14 @@ enum skl_disp_power_wells {
> #define GEN8_PCU_IIR _MMIO(0x444e8)
> #define GEN8_PCU_IER _MMIO(0x444ec)
>
> +/* BXT hotplug control */
> +#define BXT_DDIA_HPD_INVERT (1 << 27)
> +#define BXT_DDIC_HPD_INVERT (1 << 11)
> +#define BXT_DDIB_HPD_INVERT (1 << 3)
> +#define BXT_DDI_HPD_INVERT_MASK (BXT_DDIA_HPD_INVERT | \
> + BXT_DDIB_HPD_INVERT | \
> + BXT_DDIC_HPD_INVERT)
These should be moved to where the other bits for this register are.
> +
> #define ILK_DISPLAY_CHICKEN2 _MMIO(0x42004)
> /* Required on all Ironlake and Sandybridge according to the B-Spec. */
> #define ILK_ELPIN_409_SELECT (1 << 25)
> diff --git a/drivers/gpu/drm/i915/intel_bios.c
> b/drivers/gpu/drm/i915/intel_bios.c
> index a26d4b4..24d0077 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -105,6 +105,48 @@ find_section(const void *_bdb, int section_id)
> return NULL;
> }
>
> +bool
> +intel_bios_is_port_hpd_inverted(struct drm_device *dev, enum port port)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + int i;
> +
> + if (!IS_BROXTON(dev)) {
> + DRM_ERROR("Bit inversion is not required in this platform\n");
> + return false;
> + }
> +
> + for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
> +
> + if (dev_priv->vbt.child_dev[i].common.hpd_invert == 1) {
> +
> + switch (dev_priv->vbt.child_dev[i].common.dvo_port) {
> + case DVO_PORT_DPA:
> + case DVO_PORT_HDMIA:
> + if (port == PORT_A)
> + return true;
> + break;
> + case DVO_PORT_DPB:
> + case DVO_PORT_HDMIB:
> + if (port == PORT_B)
> + return true;
> + break;
> + case DVO_PORT_DPC:
> + case DVO_PORT_HDMIC:
> + if (port == PORT_C)
> + return true;
> + break;
> + default:
> + DRM_DEBUG_KMS("This dvo port %d doesn't need
> invert\n",
> +
> dev_priv->vbt.child_dev[i].common.dvo_port);
I still find this debug message confusing. In fact BXT only has ports
A,B,C, so if we end up here it would mean the VBT is broken or something,
no?
> + 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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