[PATCH 6/8] drm/i915: Enable/Disable PSR
Paulo Zanoni
przanoni at gmail.com
Thu Feb 28 09:21:12 PST 2013
Hi
So now I finally have the correct spec in hands!
2013/2/25 Rodrigo Vivi <rodrigo.vivi at gmail.com>:
> Adding Enable and Disable PSR functionalities. 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.
>
> This patch is heavily based on initial PSR code by Sateesh Kavuri and
> Kumar Shobhit but in a different implementation.
>
> Credits-by: Sateesh Kavuri <sateesh.kavuri at intel.com>
> Credits-by: Shobhit Kumar <shobhit.kumar at intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at gmail.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 40 +++++++++
> drivers/gpu/drm/i915/intel_dp.c | 183 +++++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 3 +
> 3 files changed, 226 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index b715ecd..1e31f23 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -844,6 +844,8 @@
> #define SNB_CPU_FENCE_ENABLE (1<<29)
> #define DPFC_CPU_FENCE_OFFSET 0x100104
>
> +/* Framebuffer compression for Haswell */
> +#define HSW_FBC_CONTROL 0x43208
>
> /*
> * GPIO regs
> @@ -1580,6 +1582,44 @@
> #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
> +#define EDP_PSR_AUX_DATA3 0x6481c
> +#define EDP_PSR_AUX_DATA4 0x64820
> +#define EDP_PSR_AUX_DATA5 0x64824
> +
> +#define EDP_PSR_STATUS_CTL 0x64840
> +#define EDP_PSR_STATUS_STATE_MASK (7<<29)
> +
> +#define EDP_PSR_DEBUG_CTL 0x64860
> +#define EDP_PSR_DEBUG_MASK_MEMUP (1<<26)
> +#define EDP_PSR_DEBUG_MASK_HPD (1<<25)
> +
> /* 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 5cfa9f4..a420f0d 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);
> @@ -1443,6 +1450,182 @@ static bool is_edp_psr(struct intel_dp *intel_dp)
> (intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED));
> }
>
> +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) & EDP_PSR_ENABLE;
> +}
> +
> +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;
> +
> + if (dev_priv->vbt.psr_idle_frames)
> + val |= dev_priv->vbt.psr_idle_frames << EDP_PSR_IDLE_FRAME_SHIFT;
> + else
> + val |= 1 << EDP_PSR_IDLE_FRAME_SHIFT;
> +
> + if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT) {
> + val |= EDP_PSR_LINK_STANDBY;
If we set this bit, shouldn't we also set DPCD 0x170 bit 1 to 1?
> + val |= EDP_PSR_TP2_TP3_TIME_0us;
> + val |= EDP_PSR_TP1_TIME_0us;
> + val |= EDP_PSR_SKIP_AUX_EXIT;
> + } else {
> + val |= EDP_PSR_LINK_DISABLE;
> + /* 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;
> + };
> + }
> +
> + I915_WRITE(EDP_PSR_CTL, val |
> + EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES |
> + max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
> + EDP_PSR_ENABLE);
> +}
> +
> +void intel_edp_write_vsc_psr(struct intel_dp* intel_dp,
> + struct edp_vsc_psr *vsc_psr)
> +{
> + 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));
I'd reorganize the declarations to avoid calling both intel_dp_to_crtc
and intel_dp_to_dev :)
> + u32 ctl_reg = HSW_TVIDEO_DIP_CTL(intel_crtc->cpu_transcoder);
Please don't preserve the register contents here. We don't use this
register anywhere else for DP yet.
> + u32 data_reg = HSW_TVIDEO_DIP_VSC_DATA(intel_crtc->cpu_transcoder);
> + uint32_t *data = (uint32_t *)vsc_psr;
> + unsigned int i;
> + u32 val = I915_READ(ctl_reg);
> +
> + if (data_reg == 0)
> + return;
I don't think this is ever expected, so you could probably WARN() or
BUG() here. I see this statement comes from hsw_write_infoframe
(intel_hdmi.c), we should probably try to do the WARN/BUG there too.
> +
> + /* As per eDP spec, wait for vblank to send SDP VSC packet */
> + intel_wait_for_vblank(dev, intel_crtc->pipe);
> +
Please see BSpec page "Pipe Video Data Island Packet". After waiting
the vsync you need to disable the DIP first, then write the data.
> + mmiowb();
> + for (i = 0; i < sizeof(struct edp_vsc_psr); i += 4) {
> + I915_WRITE(data_reg + i, *data);
> + data++;
> + }
> + /* Write every possible data byte to force correct ECC calculation. */
> + for (; i < VIDEO_DIP_DATA_SIZE; i += 4)
> + I915_WRITE(data_reg + i, 0);
> + mmiowb();
> +
> + val |= VIDEO_DIP_ENABLE_VSC_HSW;
> + I915_WRITE(ctl_reg, val);
> + POSTING_READ(ctl_reg);
According to the PSR enabling guide, "HW also enables VSC DIP when
required", so I guess the 3 lines above are not needed.
> +}
> +
> +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 edp_vsc_psr psr_vsc;
> + int msg_size = 5; /* Header(4) + Message(1) */
> +
> + if (!is_edp_psr(intel_dp) || intel_edp_is_psr_enabled(intel_dp))
Is it possible to have intel_edp_is_psr_enable here? If not, maybe WARN it.
> + return;
> +
> + /* 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;
> +
> + intel_edp_write_vsc_psr(intel_dp, &psr_vsc);
> +
> + /* 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
This comment is probably missing a few periods.
> + *
> + */
> + intel_dp_aux_native_write_1(intel_dp, DP_PSR_EN_CFG,
> + DP_PSR_ENABLE);
> +
> + /* Setup AUX registers */
> + /* Write command on DPCD 0x0600 */
> + I915_WRITE(EDP_PSR_AUX_DATA1, 0x80060000);
> +
> + /* Set the state to normal operation D0 in DPCD 0x0600 */
> + I915_WRITE(EDP_PSR_AUX_DATA2, 0x01000000);
I see the lines above match our spec, but I still think Jani's comment
from patch "drm/i915: Setup EDP PSR AUX Registers" is applicable here.
> +
> + I915_WRITE(EDP_PSR_AUX_CTL,
> + msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT |
> + I915_READ(DPA_AUX_CH_CTL));
I don't think this is safe, especially since we're not erasing the
original msg size bits from DPA_AUX_CH_CTL. I think we should try to
set all the bits of this register without reading DPA_AUX_CH_CTL
(maybe extract some code from intel_dp_aux_ch into new functions and
call from both here and intel_dp_aux_ch).
Also, I still think you should patch intel_dp_aux_ch to put a WARN in
case EDP_PSR_CTL bit 31 is 1.
> +
> + /* Enable PSR on the host */
> + intel_edp_psr_enable_src(intel_dp);
> +
> + /* WA: FBC/PSR Underrun/Corruption Workaround */
> + I915_WRITE(HSW_FBC_CONTROL, ~FBC_CTL_EN);
This FBC WA won't be needed on real world Hardware.
> +
> + /* WA: Continuous PSR exit Workaround */
> + I915_WRITE(EDP_PSR_DEBUG_CTL, EDP_PSR_DEBUG_MASK_MEMUP);
> + I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
All they ask is to "disabled unused interrupts", not "disable all interrupts".
> +}
> +
> +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 reg = HSW_TVIDEO_DIP_CTL(intel_crtc->cpu_transcoder);
> + uint32_t val;
> +
> + if (!intel_edp_is_psr_enabled(intel_dp))
Is this possible? Should we WARN here?
> + 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_STATE_MASK) == 0, 2000, 10))
Some big sleeps here. Can't we make them faster?
> + DRM_ERROR("Timed out waiting for PSR Idle State\n");
> +
> + intel_wait_for_vblank(dev, intel_crtc->pipe);
> +
> + val = I915_READ(reg);
> + I915_WRITE(reg, val & ~VIDEO_DIP_ENABLE_VSC_HSW);
So, based on this and on the spec, it means the HW will automagically
do the link training for us if it's needed?
> +}
> +
> 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 865ede6..cfda739 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -696,4 +696,7 @@ 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__ */
> --
> 1.8.1.2
>
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--
Paulo Zanoni
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