[PATCH 7/9] drm/i915: Enable/Disable PSR on HSW
Paulo Zanoni
przanoni at gmail.com
Thu Jan 31 14:01:11 PST 2013
Hi
2013/1/30 Rodrigo Vivi <rodrigo.vivi at gmail.com>:
> From: Shobhit Kumar <shobhit.kumar at intel.com>
>
> Added eDP PSR enable functionality. This includes setting the PSR
> configuration over AUX, sending SDP VSC DIP over the eDP PIPE config,
> enabling PSR in the sink via DPCD register and finally enabling PSR on
> the host. PSR works only in LPSP mode, so put the PIPE_DDI in DDIA
> always on
>
> This patch is heavily based on initial PSR code by Sateesh Kavuri but is
> quite different in implementation. Makes use of VBT parsed data and also
> the code has been cleaned up.
>
> Credits-by: Sateesh Kavuri <sateesh.kavuri at intel.com>
> Signed-off-by: Shobhit Kumar <shobhit.kumar at intel.com>
>
> v2: fix getting base.crtc from intel_dp and fix DDI_EDP_INPUT_A_ON entry
> v3: Add eDP PSR registers here only when they are really used and use
> HSW_TVIDEO_DIP_AVI_DATA(cpu_transcoder)
>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 24 ++++++
> drivers/gpu/drm/i915/intel_ddi.c | 6 +-
> drivers/gpu/drm/i915/intel_dp.c | 172 +++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 3 +
> 4 files changed, 204 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 10732dc..6f87d5b 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1563,6 +1563,30 @@
> #define BCLRPAT(pipe) _PIPE(pipe, _BCLRPAT_A, _BCLRPAT_B)
> #define VSYNCSHIFT(trans) _TRANSCODER(trans, _VSYNCSHIFT_A, _VSYNCSHIFT_B)
>
> +/* HSW eDP PSR registers */
> +#define EDP_PSR_CTL 0x64800
> +#define EDP_PSR_ENABLE (1<<31)
> +#define EDP_PSR_LINK_DISABLE (0<<27)
> +#define EDP_PSR_LINK_STANDBY (1<<27)
> +#define EDP_PSR_MIN_LINK_ENTRY_TIME_MASK (3<<25)
> +#define EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES (0<<25)
> +#define EDP_PSR_MIN_LINK_ENTRY_TIME_4_LINES (1<<25)
> +#define EDP_PSR_MIN_LINK_ENTRY_TIME_2_LINES (2<<25)
> +#define EDP_PSR_MIN_LINK_ENTRY_TIME_0_LINES (3<<25)
> +#define EDP_PSR_MAX_SLEEP_TIME_SHIFT 20
> +#define EDP_PSR_SKIP_AUX_EXIT (1<<12)
> +#define EDP_PSR_TP1_TP2_SEL (0<<11)
> +#define EDP_PSR_TP1_TP3_SEL (1<<11)
> +#define EDP_PSR_TP2_TP3_TIME_500us (0<<8)
> +#define EDP_PSR_TP2_TP3_TIME_100us (1<<8)
> +#define EDP_PSR_TP2_TP3_TIME_2500us (2<<8)
> +#define EDP_PSR_TP2_TP3_TIME_0us (3<<8)
> +#define EDP_PSR_TP1_TIME_500us (0<<4)
> +#define EDP_PSR_TP1_TIME_100us (1<<4)
> +#define EDP_PSR_TP1_TIME_2500us (2<<4)
> +#define EDP_PSR_TP1_TIME_0us (3<<4)
> +#define EDP_PSR_IDLE_FRAME_SHIFT 0
> +
> #define EDP_PSR_AUX_CTL 0x64810
> #define EDP_PSR_AUX_DATA1 0x64814
> #define EDP_PSR_AUX_DATA2 0x64818
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 2e904a5..feb7a4a 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -985,9 +985,13 @@ void intel_ddi_enable_pipe_func(struct drm_crtc *crtc)
> temp |= TRANS_DDI_PHSYNC;
>
> if (cpu_transcoder == TRANSCODER_EDP) {
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> switch (pipe) {
> case PIPE_A:
> - temp |= TRANS_DDI_EDP_INPUT_A_ONOFF;
> + if (intel_dp->psr_dpcd[0] & 0x1)
if (is_edp_psr(intel_dp))
> + temp |= TRANS_DDI_EDP_INPUT_A_ON;
> + else
> + temp |= TRANS_DDI_EDP_INPUT_A_ONOFF;
> break;
> case PIPE_B:
> temp |= TRANS_DDI_EDP_INPUT_B_ONOFF;
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index fe83e05..d136890 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -83,6 +83,13 @@ static struct drm_device *intel_dp_to_dev(struct intel_dp *intel_dp)
> return intel_dig_port->base.base.dev;
> }
>
> +static struct drm_crtc *intel_dp_to_crtc(struct intel_dp *intel_dp)
> +{
> + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> +
> + return intel_dig_port->base.base.crtc;
> +}
> +
> static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
> {
> return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
> @@ -1489,6 +1496,171 @@ static void intel_edp_psr_setup(struct intel_dp *intel_dp)
> intel_dp->psr_setup = 1;
> }
>
> +static bool
> +intel_edp_is_psr_enabled(struct intel_dp* intel_dp)
> +{
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + return (I915_READ(EDP_PSR_CTL) & (1<<31)) ? true : false;
> +}
> +
> +
> +static void
> +intel_edp_psr_enable_src(struct intel_dp *intel_dp)
> +{
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + uint32_t max_sleep_time = 0x1f;
> + uint32_t val = 0x0;
> +
> + /* Use VBT values which are parsed in
> + * dev_priv->idle_frames,
> + * but the BIOS initializes this to zero today
> + * so hardcode
> + */
> + uint32_t idle_frames = 6;
How old is that comment? Where did we get 6 from?
> +
> + if (intel_dp->psr_dpcd[1] & 0x1) {
if (is_edp_psr(intel_dp))
> + /* No link training on PSR Exit required */
> + val |= EDP_PSR_TP2_TP3_TIME_0us;
> + val |= EDP_PSR_TP1_TIME_0us;
> + val |= EDP_PSR_SKIP_AUX_EXIT;
> + } else {
> + /* Use these Values from VBT
> + * Case values are timings for HSW as of now
> + * in multiple of 100us
> + */
> + switch(dev_priv->vbt.psr_wakeup_tp1) {
> + case 1:
> + val |= EDP_PSR_TP1_TIME_100us;
> + break;
> + case 5:
> + val |= EDP_PSR_TP1_TIME_500us;
> + break;
> + case 25:
> + val |= EDP_PSR_TP1_TIME_2500us;
> + break;
> + default:
> + val |= EDP_PSR_TP1_TIME_500us;
> + break;
> + };
> + switch(dev_priv->vbt.psr_wakeup_tp2_tp3) {
> + case 1:
> + val |= EDP_PSR_TP2_TP3_TIME_100us;
> + break;
> + case 5:
> + val |= EDP_PSR_TP2_TP3_TIME_500us;
> + break;
> + case 25:
> + val |= EDP_PSR_TP2_TP3_TIME_2500us;
> + break;
> + default:
> + val |= EDP_PSR_TP2_TP3_TIME_500us;
> + break;
> + };
> + }
> +
> + /* Disable main link. Anyway in HSW steppings today
> + * link standby does not work
Is this comment still true?
> + *
> + * Later used VBT info (already parsed and available)
> + * while supporting standby we need to program
> + * val |= EDP_PSR_MIN_LINK_ENTRY_TIME_X_LINES based on VBT
> + */
> + val = (val & ~EDP_PSR_LINK_STANDBY) |
> + (max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT) |
> + (idle_frames << EDP_PSR_IDLE_FRAME_SHIFT) |
> + EDP_PSR_ENABLE;
> +
> + I915_WRITE(EDP_PSR_CTL, val);
> +}
> +
> +void intel_edp_enable_psr(struct intel_dp* intel_dp)
> +{
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp_to_crtc(intel_dp));
> + struct edp_vsc_psr psr_vsc;
> + uint32_t reg = HSW_TVIDEO_DIP_AVI_DATA(intel_crtc->cpu_transcoder);
Shouldn't it be HSW_TVIDEO_DIP_VSC_DATA? Shouldn't we get a bunch of
"unclaimed register"s when writing to
HSW_TVIDEO_DIP_AVI_DATA(TRANSCODER_EDP)? Please check whether your
series introduces any new "unclaimed register" messages.
> + uint32_t *vsc_data = (uint32_t *) &psr_vsc;
> + int i = 0, vsc_len = sizeof(struct edp_vsc_psr);
> +
> + if (!is_edp_psr(intel_dp))
> + return;
> +
> + /* setup AUX registers in case returned from pm states */
> + intel_edp_psr_setup(intel_dp);
> +
> + /* Check if PSR is already enabled */
> + if (!intel_edp_is_psr_enabled(intel_dp)) {
> + /* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
> + memset(&psr_vsc, 0, sizeof(psr_vsc));
> + psr_vsc.sdp_header.id = 0;
> + psr_vsc.sdp_header.type = 0x7;
> + psr_vsc.sdp_header.revision = 0x2;
> + psr_vsc.sdp_header.valid_payload_bytes = 0x8;
> +
> + /* As per eDP spec, wait for vblank to send SDP VSC packet */
> + intel_wait_for_vblank(dev, intel_crtc->pipe);
> +
> + /* Load the VSC DIP packet */
> + for(i = 0; i < vsc_len; i += 4)
> + I915_WRITE((reg + i), vsc_data[i]);
How about reusing hsw_write_infoframe from intel_hdmi.c somehow? It
implements all the "restrictions" we need to respect.
> +
> +#if 0
> + /* TBD:
> + * We might not have to do explicitely as hardware will take care of this */
> + /* Enable the DIP register */
> + val = I915_READ(VIDEO_DIP_CTL_EDP);
> + I915_WRITE(VIDEO_DIP_CTL_EDP, val | VIDEOP_DIP_VSC);
> +#endif
Hardware will take care of this? You mean the BIOS? Please try to
configure your BIOS to not configure the panel (make it boot on an
external monitor, not on the panel) and then try to boot your machine,
check if PSR still works after our driver loads. Also, please try to
reuse hsw_set_infoframes instead of the code above, if applicable.
Also, I'm not sure we want to add "#if 0"ed code.
> + /* Enable PSR in sink by setting bit 0 in DPCD config reg
> + * along with the transmitter state during PSR active
> + * Transmitter state later can be ready from VBT. As of now
> + * program the full link down
> + *
> + */
> + intel_dp_aux_native_write_1(intel_dp, DP_PSR_EN_CFG,
> + DP_PSR_ENABLE &
> + ~DP_PSR_MAIN_LINK_ACTIVE);
> +
> + /* Enable PSR on the host */
> + intel_edp_psr_enable_src(intel_dp);
> + }
> +}
> +
> +void intel_edp_disable_psr(struct intel_dp* intel_dp)
> +{
> + struct drm_device *dev = intel_dp_to_dev(intel_dp);
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp_to_crtc(intel_dp));
> + uint32_t val;
> + if (!intel_edp_is_psr_enabled(intel_dp))
> + return;
> +
> + val = I915_READ(EDP_PSR_CTL);
> + I915_WRITE(EDP_PSR_CTL, (val & ~EDP_PSR_ENABLE));
> +
> + /* Wait till PSR is idle */
> + if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL) & EDP_PSR_STATUS_MASK) == 0, 2000, 10))
> + DRM_ERROR("Timed out waiting for PSR Idle State\n");
> +
> + intel_wait_for_vblank(dev, intel_crtc->pipe);
Where is this vblank wait documented?
> +
> +#if 0
> + /* TBD:
> + * Following is not yet confirmed from H/W team.
> + * As per last discussion we do not need to disable
> + * VSC DIP explicitely. Just maintaining the code in
> + * case we have to do this later at some point
> + */
> +
> + /* Disable VSC DIP */
> + val = I915_READ(VIDEO_DIP_CTL_EDP);
> + I915_WRITE(VIDEO_DIP_CTL_EDP, val & ~VIDEOP_DIP_VSC);
> +#endif
I'd vote to disable and also try to reuse the functions inside
intel_hdmi.c for this.
> +}
> +
> static void intel_enable_dp(struct intel_encoder *encoder)
> {
> struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 3fa2dd0..2f48e5c 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -692,4 +692,7 @@ extern bool
> intel_ddi_connector_get_hw_state(struct intel_connector *intel_connector);
> extern void intel_ddi_fdi_disable(struct drm_crtc *crtc);
>
> +extern void intel_edp_enable_psr(struct intel_dp* intel_dp);
> +extern void intel_edp_disable_psr(struct intel_dp* intel_dp);
> +
> #endif /* __INTEL_DRV_H__ */
> --
> 1.7.11.7
>
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--
Paulo Zanoni
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