Re: [PATCH] drm/i915/skl: Enabling PSR2 SU with frame sync

Daniel Vetter
2015-04-07T08:05:21Z

On Thu, Apr 02, 2015 at 11:02:44AM +0530, Sonika Jindal wrote:
> We make use of HW tracking for Selective update region and enable frame sync on
> sink. We use hardware's hardcoded data values for frame sync and GTC.
>
> v2: Add 3200x2000 resolution restriction with PSR2, move psr2_support to i915_psr
> struct, add aux_frame_sync to independently control aux frame sync, rename the
> TP2 TIME macro for 2500us (Rodrigo, Siva)
> v3: Moving the resolution restriction to intel_psr_enable so that we check it
> only once(Durga)
>
> Cc: Durgadoss R <durgadoss.r@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> Reviewed-by: Durgadoss R <durgadoss.r@intel.com>
> ---
> Hi Daniel,
>
> It applies cleanly for me. Still I created new patch.
> Please try, if it works for you.

Yeah this one worked perfectly. Dunno what happened with the old one.
Thanks for resending, applied to dinq.
-Daniel

>
> Regards,
> Sonika
>
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/i915_reg.h | 14 ++++++++++++++
> drivers/gpu/drm/i915/intel_dp.c | 15 +++++++++++++++
> drivers/gpu/drm/i915/intel_psr.c | 38 +++++++++++++++++++++++++++++++++++++-
> 4 files changed, 68 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index b13c552..f0e1f2e 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -881,6 +881,8 @@ struct i915_psr {
> struct delayed_work work;
> unsigned busy_frontbuffer_bits;
> bool link_standby;
> + bool psr2_support;
> + bool aux_frame_sync;
> };
>
> enum intel_pch {
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index b134fa3..59e9b2d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2748,6 +2748,20 @@ enum skl_disp_power_wells {
> #define EDP_PSR_DEBUG_MASK_MEMUP (1<<26)
> #define EDP_PSR_DEBUG_MASK_HPD (1<<25)
>
> +#define EDP_PSR2_CTL 0x6f900
> +#define EDP_PSR2_ENABLE (1<<31)
> +#define EDP_SU_TRACK_ENABLE (1<<30)
> +#define EDP_MAX_SU_DISABLE_TIME(t) ((t)<<20)
> +#define EDP_MAX_SU_DISABLE_TIME_MASK (0x1f<<20)
> +#define EDP_PSR2_TP2_TIME_500 (0<<8)
> +#define EDP_PSR2_TP2_TIME_100 (1<<8)
> +#define EDP_PSR2_TP2_TIME_2500 (2<<8)
> +#define EDP_PSR2_TP2_TIME_50 (3<<8)
> +#define EDP_PSR2_TP2_TIME_MASK (3<<8)
> +#define EDP_PSR2_FRAME_BEFORE_SU_SHIFT 4
> +#define EDP_PSR2_FRAME_BEFORE_SU_MASK (0xf<<4)
> +#define EDP_PSR2_IDLE_MASK 0xf
> +
> /* VGA port control */
> #define ADPA 0x61100
> #define PCH_ADPA 0xe1100
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 7936155..a651dba 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3785,6 +3785,21 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp)
> dev_priv->psr.sink_support = true;
> DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
> }
> +
> + if (INTEL_INFO(dev)->gen >= 9 &&
> + (intel_dp->psr_dpcd[0] & DP_PSR2_IS_SUPPORTED)) {
> + uint8_t frame_sync_cap;
> +
> + dev_priv->psr.sink_support = true;
> + intel_dp_dpcd_read_wake(&intel_dp->aux,
> + DP_SINK_DEVICE_AUX_FRAME_SYNC_CAP,
> + &frame_sync_cap, 1);
> + dev_priv->psr.aux_frame_sync = frame_sync_cap ? true : false;
> + /* PSR2 needs frame sync as well */
> + dev_priv->psr.psr2_support = dev_priv->psr.aux_frame_sync;
> + DRM_DEBUG_KMS("PSR2 %s on sink",
> + dev_priv->psr.psr2_support ? "supported" : "not supported");
> + }
> }
>
> /* Training Pattern 3 support, both source and sink */
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index 9668735..27608ce 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -117,6 +117,19 @@ static void vlv_psr_setup_vsc(struct intel_dp *intel_dp)
> I915_WRITE(VLV_VSCSDP(pipe), val);
> }
>
> +static void skl_psr_setup_su_vsc(struct intel_dp *intel_dp)
> +{
> + struct edp_vsc_psr psr_vsc;
> +
> + /* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
> + memset(&psr_vsc, 0, sizeof(psr_vsc));
> + psr_vsc.sdp_header.HB0 = 0;
> + psr_vsc.sdp_header.HB1 = 0x7;
> + psr_vsc.sdp_header.HB2 = 0x3;
> + psr_vsc.sdp_header.HB3 = 0xb;
> + intel_psr_write_vsc(intel_dp, &psr_vsc);
> +}
> +
> static void hsw_psr_setup_vsc(struct intel_dp *intel_dp)
> {
> struct edp_vsc_psr psr_vsc;
> @@ -165,6 +178,12 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
> drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
> DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE);
>
> + /* Enable AUX frame sync at sink */
> + if (dev_priv->psr.aux_frame_sync)
> + drm_dp_dpcd_writeb(&intel_dp->aux,
> + DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
> + DP_AUX_FRAME_SYNC_ENABLE);
> +
> aux_data_reg = (INTEL_INFO(dev)->gen >= 9) ?
> DPA_AUX_CH_DATA1 : EDP_PSR_AUX_DATA1(dev);
> aux_ctl_reg = (INTEL_INFO(dev)->gen >= 9) ?
> @@ -183,8 +202,10 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
> val |= DP_AUX_CH_CTL_TIME_OUT_1600us;
> val &= ~DP_AUX_CH_CTL_MESSAGE_SIZE_MASK;
> val |= (sizeof(aux_msg) << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
> - /* Use hardcoded data values for PSR */
> + /* Use hardcoded data values for PSR, frame sync and GTC */
> val &= ~DP_AUX_CH_CTL_PSR_DATA_AUX_REG_SKL;
> + val &= ~DP_AUX_CH_CTL_FS_DATA_AUX_REG_SKL;
> + val &= ~DP_AUX_CH_CTL_GTC_DATA_AUX_REG_SKL;
> I915_WRITE(aux_ctl_reg, val);
> } else {
> I915_WRITE(aux_ctl_reg,
> @@ -232,6 +253,7 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp)
> struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> struct drm_device *dev = dig_port->base.base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> +
> uint32_t max_sleep_time = 0x1f;
> /* Lately it was identified that depending on panel idle frame count
> * calculated at HW can be off by 1. So let's use what came
> @@ -255,6 +277,10 @@ static void hsw_psr_enable_source(struct intel_dp *intel_dp)
> max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
> idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
> EDP_PSR_ENABLE);
> +
> + if (dev_priv->psr.psr2_support)
> + I915_WRITE(EDP_PSR2_CTL, EDP_PSR2_ENABLE |
> + EDP_SU_TRACK_ENABLE | EDP_PSR2_TP2_TIME_100);
> }
>
> static bool intel_psr_match_conditions(struct intel_dp *intel_dp)
> @@ -332,6 +358,7 @@ void intel_psr_enable(struct intel_dp *intel_dp)
> struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> struct drm_device *dev = intel_dig_port->base.base.dev;
> struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_crtc *crtc = to_intel_crtc(intel_dig_port->base.base.crtc);
>
> if (!HAS_PSR(dev)) {
> DRM_DEBUG_KMS("PSR not supported on this platform\n");
> @@ -364,6 +391,15 @@ void intel_psr_enable(struct intel_dp *intel_dp)
> if (HAS_DDI(dev)) {
> hsw_psr_setup_vsc(intel_dp);
>
> + if (dev_priv->psr.psr2_support) {
> + /* PSR2 is restricted to work with panel resolutions upto 3200x2000 */
> + if (crtc->config->pipe_src_w > 3200 ||
> + crtc->config->pipe_src_h > 2000)
> + dev_priv->psr.psr2_support = false;
> + else
> + skl_psr_setup_su_vsc(intel_dp);
> + }
> +
> /* Avoid continuous PSR exit by masking memup and hpd */
> I915_WRITE(EDP_PSR_DEBUG_CTL(dev), EDP_PSR_DEBUG_MASK_MEMUP |
> EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);
> --
> 1.7.10.4
>
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--
Daniel Vetter
Software Engineer, Intel Corporation