[Intel-gfx] [RFC-v2 8/9] drm/i915/dsi: Add TE handler for dsi cmd mode.

[Jani Nikula]

On Mon, 11 Nov 2019, Vandita Kulkarni <vandita.kulkarni at intel.com> wrote:
> In case of dual link, we get the TE on slave.
> So clear the TE on slave DSI IIR.
>
> Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 62 +++++++++++++++++++++++++++++++++
>  1 file changed, 62 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index f27afde409bf..34a06876a2d7 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2230,6 +2230,62 @@ gen8_de_misc_irq_handler(struct drm_i915_private *dev_priv, u32 iir)
>  		DRM_ERROR("Unexpected DE Misc interrupt\n");
>  }
>  
> +void gen11_dsi_te_interrupt_handler(struct drm_i915_private *dev_priv,
> +				    u32 iir_value)
> +{
> +	enum pipe pipe = INVALID_PIPE;
> +	enum transcoder dsi_trans;
> +	enum port port;
> +	u32 val, tmp;
> +
> +	/*
> +	 * Incase of dual link, TE comes from DSI_1
> +	 * this is to check if dual link is enabled
> +	 */
> +	val = I915_READ(TRANS_DDI_FUNC_CTL2(TRANSCODER_DSI_0));
> +	val &= PORT_SYNC_MODE_ENABLE;
> +
> +	/*
> +	 * if dual link is enabled, then read DSI_0
> +	 * transcoder registers
> +	 */
> +	port = ((iir_value & DSI1_TE && val) || (iir_value & DSI0_TE)) ?
> +								PORT_A : PORT_B;
> +	dsi_trans = (port == PORT_A) ? TRANSCODER_DSI_0 : TRANSCODER_DSI_1;
> +
> +	/* Check if DSI configured in command mode */
> +	val = I915_READ(DSI_TRANS_FUNC_CONF(dsi_trans));
> +	val = (val & OP_MODE_MASK) >> 28;
> +
> +	if (val) {
> +		DRM_ERROR("DSI trancoder not configured in command mode\n");
> +		return;
> +	}
> +
> +	/* Get PIPE for handling VBLANK event */
> +	val = I915_READ(TRANS_DDI_FUNC_CTL(dsi_trans));
> +	switch (val & TRANS_DDI_EDP_INPUT_MASK) {
> +	case TRANS_DDI_EDP_INPUT_A_ON:
> +		pipe = PIPE_A;
> +		break;
> +	case TRANS_DDI_EDP_INPUT_B_ONOFF:
> +		pipe = PIPE_B;
> +		break;
> +	case TRANS_DDI_EDP_INPUT_C_ONOFF:
> +		pipe = PIPE_C;
> +		break;
> +	default:
> +		DRM_ERROR("Invalid PIPE\n");
> +	}
> +
> +	/* clear TE in dsi IIR */
> +	port = (iir_value & DSI1_TE) ? PORT_B : PORT_A;
> +	tmp = I915_READ(DSI_INTR_IDENT_REG(port));
> +	I915_WRITE(DSI_INTR_IDENT_REG(port), tmp);
> +
> +	drm_handle_vblank(&dev_priv->drm, pipe);
> +}
> +
>  static irqreturn_t
>  gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
>  {
> @@ -2294,6 +2350,12 @@ gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
>  				found = true;
>  			}
>  
> +			if ((INTEL_GEN(dev_priv) >= 11) &&
> +				(iir & (DSI0_TE | DSI1_TE))) {

Please follow the same style as nearby:

        if (gen11) {
                tmp_mask = iir & (DSI0_TE | DSI1_TE);
                if (tmp_mask) {
                        gen11_dsi_te_interrupt_handler(dev_priv, tmp_mask);
                        found = true;
                }
        }

Even if that's functionally the same, I think it's cleaner to only pass
the relevant masked bits to the handler.


> +				gen11_dsi_te_interrupt_handler(dev_priv, iir);
> +				found = true;
> +			}
> +
>  			if (!found)
>  				DRM_ERROR("Unexpected DE Port interrupt\n");
>  		}

-- 
Jani Nikula, Intel Open Source Graphics Center