On pe, 2016-10-14 at 14:54 +0530, Shashank Sharma wrote:
> As per the software design, we are driving lspcon in
> PCON mode. But while resuming from suspend, lspcon can go
> in LS mode (which is its default operating mode on power on)
>
> This patch adds a resume function for lspcon, which makes sure
> its operating in PCON mode, post resume.
>
> Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 2 ++
> drivers/gpu/drm/i915/intel_drv.h | 1 +
> drivers/gpu/drm/i915/intel_lspcon.c | 38
> +++++++++++++++++++++++++++++++++++++
> 3 files changed, 41 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index e9b3bfc..d87281d 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -1574,6 +1574,8 @@ static int i915_drm_resume(struct drm_device *dev)
> dev_priv->display.hpd_irq_setup(dev_priv);
> spin_unlock_irq(&dev_priv->irq_lock);
>
> + lspcon_resume(dev);
> +
This should go to the encoder reset hook.
> intel_dp_mst_resume(dev);
>
> intel_display_resume(dev);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h
> b/drivers/gpu/drm/i915/intel_drv.h
> index 27837b0..e8760a4 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1850,4 +1850,5 @@ void intel_color_load_luts(struct drm_crtc_state
> *crtc_state);
>
> /* intel_lspcon.c */
> bool lspcon_init(struct intel_digital_port *intel_dig_port);
> +void lspcon_resume(struct drm_device *dev);
> #endif /* __INTEL_DRV_H__ */
> diff --git a/drivers/gpu/drm/i915/intel_lspcon.c
> b/drivers/gpu/drm/i915/intel_lspcon.c
> index aa74b1f..ba660ecb 100644
> --- a/drivers/gpu/drm/i915/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/intel_lspcon.c
> @@ -27,6 +27,29 @@
> #include
> #include "intel_drv.h"
>
> +/*
> + * This function assumes only one LSPCON port on the device,
> + * and returns the first active LSPCON port.
> + */
> +static struct intel_lspcon *find_active_lspcon(struct drm_device *dev)
> +{
> + struct intel_lspcon *lspcon = NULL;
> + struct intel_encoder *intel_encoder;
> +
> + for_each_intel_encoder(dev, intel_encoder) {
> + struct intel_digital_port *intel_dig_port;
> +
> + intel_dig_port = enc_to_dig_port(&intel_encoder->base);
> + lspcon = &intel_dig_port->lspcon;
> + if (lspcon->active) {
> + DRM_DEBUG_KMS("LSPCON active : port %c\n",
> + port_name(intel_dig_port->port));
> + break;
> + }
> + }
> + return lspcon;
> +}
> +
> enum drm_lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
> {
> enum drm_lspcon_mode current_mode = DRM_LSPCON_MODE_INVALID;
> @@ -89,6 +112,21 @@ static bool lspcon_probe(struct intel_lspcon *lspcon)
> return true;
> }
>
> +void lspcon_resume(struct drm_device *dev)
> +{
> + if (IS_GEN9(dev)) {
> + struct intel_lspcon *lspcon = find_active_lspcon(dev);
> +
> + if (lspcon) {
> + if (lspcon_change_mode(lspcon, DRM_LSPCON_MODE_PCON,
> + true))
> + DRM_ERROR("LSPCON resume failed\n");
> + else
> + DRM_DEBUG_KMS("LSPCON resume success\n");
> + }
> + }
> +}
Nitpick: you could reduce indentation above by using early returns.
> +
> bool lspcon_init(struct intel_digital_port *intel_dig_port)
> {
> struct intel_dp *dp = &intel_dig_port->dp;
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