[Intel-gfx] [PATCH 04/22] drm/i915/tgl: Add hpd interrupt handling

[Ville Syrjälä]

On Fri, Jul 19, 2019 at 09:45:16AM -0700, Lucas De Marchi wrote:
> On Fri, Jul 19, 2019 at 04:47:45PM +0300, Ville Syrjälä wrote:
> >On Fri, Jul 12, 2019 at 06:09:22PM -0700, Lucas De Marchi wrote:
> >> Add hotdplug detection for all ports on TGP. icp_hpd_detection_setup()
> >> is refactored to be shared with TGP.
> >>
> >> While we increase the number of pins, add a BUILD_BUG_ON() to avoid
> >> going over the number of bits allowed.
> >>
> >> Cc: Jose Souza <jose.souza at intel.com>
> >> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> >> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> >> ---
> >>  drivers/gpu/drm/i915/display/intel_hotplug.c |   6 +
> >>  drivers/gpu/drm/i915/i915_drv.h              |   4 +
> >>  drivers/gpu/drm/i915/i915_irq.c              | 128 +++++++++++++++++--
> >>  drivers/gpu/drm/i915/i915_reg.h              |  28 +++-
> >>  4 files changed, 154 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> >> index ea3de4acc850..a7833f45dc4d 100644
> >> --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> >> +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> >> @@ -104,6 +104,12 @@ enum hpd_pin intel_hpd_pin_default(struct drm_i915_private *dev_priv,
> >>  		if (IS_CNL_WITH_PORT_F(dev_priv))
> >>  			return HPD_PORT_E;
> >>  		return HPD_PORT_F;
> >> +	case PORT_G:
> >> +		return HPD_PORT_G;
> >> +	case PORT_H:
> >> +		return HPD_PORT_H;
> >> +	case PORT_I:
> >> +		return HPD_PORT_I;
> >>  	default:
> >>  		MISSING_CASE(port);
> >>  		return HPD_NONE;
> >> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> >> index cf7e92ca72e9..069337f11872 100644
> >> --- a/drivers/gpu/drm/i915/i915_drv.h
> >> +++ b/drivers/gpu/drm/i915/i915_drv.h
> >> @@ -153,6 +153,10 @@ enum hpd_pin {
> >>  	HPD_PORT_D,
> >>  	HPD_PORT_E,
> >>  	HPD_PORT_F,
> >> +	HPD_PORT_G,
> >> +	HPD_PORT_H,
> >> +	HPD_PORT_I,
> >> +
> >>  	HPD_NUM_PINS
> >>  };
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> >> index 7c5ba5cbea34..a7a90674db89 100644
> >> --- a/drivers/gpu/drm/i915/i915_irq.c
> >> +++ b/drivers/gpu/drm/i915/i915_irq.c
> >> @@ -148,6 +148,18 @@ static const u32 hpd_mcc[HPD_NUM_PINS] = {
> >>  	[HPD_PORT_C] = SDE_TC1_HOTPLUG_ICP
> >>  };
> >>
> >> +static const u32 hpd_tgp[HPD_NUM_PINS] = {
> >> +	[HPD_PORT_A] = SDE_DDIA_HOTPLUG_ICP,
> >> +	[HPD_PORT_B] = SDE_DDIB_HOTPLUG_ICP,
> >> +	[HPD_PORT_C] = SDE_DDIC_HOTPLUG_TGP,
> >> +	[HPD_PORT_D] = SDE_TC1_HOTPLUG_ICP,
> >> +	[HPD_PORT_E] = SDE_TC2_HOTPLUG_ICP,
> >> +	[HPD_PORT_F] = SDE_TC3_HOTPLUG_ICP,
> >> +	[HPD_PORT_G] = SDE_TC4_HOTPLUG_ICP,
> >> +	[HPD_PORT_H] = SDE_TC5_HOTPLUG_TGP,
> >> +	[HPD_PORT_I] = SDE_TC6_HOTPLUG_TGP,
> >> +};
> >> +
> >>  static void gen3_irq_reset(struct intel_uncore *uncore, i915_reg_t imr,
> >>  			   i915_reg_t iir, i915_reg_t ier)
> >>  {
> >> @@ -1706,6 +1718,40 @@ static bool icp_tc_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
> >>  	}
> >>  }
> >>
> >> +static bool tgp_ddi_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
> >> +{
> >> +	switch (pin) {
> >> +	case HPD_PORT_A:
> >> +		return val & ICP_DDIA_HPD_LONG_DETECT;
> >> +	case HPD_PORT_B:
> >> +		return val & ICP_DDIB_HPD_LONG_DETECT;
> >> +	case HPD_PORT_C:
> >> +		return val & TGP_DDIC_HPD_LONG_DETECT;
> >> +	default:
> >> +		return false;
> >> +	}
> >> +}
> >> +
> >> +static bool tgp_tc_port_hotplug_long_detect(enum hpd_pin pin, u32 val)
> >> +{
> >> +	switch (pin) {
> >> +	case HPD_PORT_D:
> >> +		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC1);
> >> +	case HPD_PORT_E:
> >> +		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC2);
> >> +	case HPD_PORT_F:
> >> +		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC3);
> >> +	case HPD_PORT_G:
> >> +		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC4);
> >> +	case HPD_PORT_H:
> >> +		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC5);
> >> +	case HPD_PORT_I:
> >> +		return val & ICP_TC_HPD_LONG_DETECT(PORT_TC6);
> >> +	default:
> >> +		return false;
> >> +	}
> >> +}
> >> +
> >>  static bool spt_port_hotplug2_long_detect(enum hpd_pin pin, u32 val)
> >>  {
> >>  	switch (pin) {
> >> @@ -1785,6 +1831,8 @@ static void intel_get_hpd_pins(struct drm_i915_private *dev_priv,
> >>  {
> >>  	enum hpd_pin pin;
> >>
> >> +	BUILD_BUG_ON(sizeof(int) * 8 < HPD_NUM_PINS);
> >
> >BUILD_BUG_ON(HPD_NUM_PINS > BITS_PER_TYPE(*pin_mask));
> >would be a clearer way to express that.
> 
> For the BITS_PER_TYPE, ok. But for the swapped order, checkpatch doesn't
> agree:
> 
> 8b77abf61be2 (HEAD) drm/i915/tgl: Add hpd interrupt handling
> -:117: WARNING:CONSTANT_COMPARISON: Comparisons should place the constant on the right side of the test
> #117: FILE: drivers/gpu/drm/i915/i915_irq.c:1852:
> +       BUILD_BUG_ON(HPD_NUM_PINS > BITS_PER_TYPE(*pin_mask));
> 
> Note: Initially I did with the same order you suggested and had to swap
> it while cleaning up the checkpatch warnings.

Checkpatch is stupid. HPD_NUM_PINS is clearly the "variable" we're trying
to check here, not the constant we're checking against.

-- 
Ville Syrjälä
Intel