[Intel-gfx] [PATCH] drm/i915/bxt: Use intel_encoder->hpd_pin to check live status

[Daniel Vetter]

On Mon, Sep 14, 2015 at 02:08:41PM +0530, Jindal, Sonika wrote:
> 
> 
> On 9/14/2015 2:04 PM, Daniel Vetter wrote:
> >On Fri, Sep 11, 2015 at 04:58:32PM +0530, Sonika Jindal wrote:
> >>Using intel_encoder's hpd_pin to check the live status
> >>because of BXT A0/A1 WA for HPD pins and hpd_pin contains the
> >>updated pin for the corresponding port.
> >>
> >>Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>
> >>---
> >>  drivers/gpu/drm/i915/intel_dp.c |    9 ++++++---
> >>  1 file changed, 6 insertions(+), 3 deletions(-)
> >>
> >>diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> >>index 796f930..bf17030 100644
> >>--- a/drivers/gpu/drm/i915/intel_dp.c
> >>+++ b/drivers/gpu/drm/i915/intel_dp.c
> >>@@ -4663,11 +4663,14 @@ static bool vlv_digital_port_connected(struct drm_i915_private *dev_priv,
> >>  }
> >>
> >>  static bool bxt_digital_port_connected(struct drm_i915_private *dev_priv,
> >>-				       struct intel_digital_port *port)
> >>+				       struct intel_digital_port *intel_dig_port)
> >>  {
> >>+	struct intel_encoder *intel_encoder = &intel_dig_port->base;
> >>+	enum port port;
> >>  	u32 bit;
> >>
> >>-	switch (port->port) {
> >>+	intel_hpd_pin_to_port(intel_encoder->hpd_pin, &port);
> >
> >This looks very wrong - the function you're calling here maps from hpd_pin
> >to the port, but what you actually want is to map from port to pin. That
> >mapping is in intel_encoder->hpd_pin.
> >-Daniel
> No, I want to find out the correct port whose hpd bit we need to check.
> That port we are finding based upon the hpd_pin we have set for that
> encoder. This was the whole point of using hpd_pin for the BXT A0/A1 WA.
> That instead of checking different HPD bit based upon the port, just change
> the hpd_pin itself in intel_encoder.

Ah right I was getting confused. Patch applied now, thanks for clarifying.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch