On Tue, Mar 15, 2016 at 02:34:05PM -0700, clinton.a.taylor@xxxxxxxxx wrote:
> From: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
>
> WARNING: Using ChromeOS with an eDP panel and a 4K@60 DP monitor connected
> to DDI1 the system will hard hang during a cold boot. Occurs when DDI1
> is enabled when the cdclk is less then required. DP connected to DDI2
> and HPD on either port works correctly.
So this patch hard-hangs machines?
>
> Set cdclk based on the max required pixel clock based on VCO
> selected. Track boot vco instead of boot cdclk.
>
> The vco is now tracked at the atomic level and all CRTCs updated if
> the required vco is changed. Not tested with eDP v1.4 panels that
> require 8640 vco due to availability.
>
> V1: initial version
> V2: add vco tracking in intel_dp_compute_config(), rename
> skl_boot_cdclk.
> V3: rebase, V2 feedback not possible as encoders are not aware of
> atomic.
> V4: track target vco is atomic state. modeset all CRTCs if vco changes
> V5: rename atomic variable, cleaner if/else logic, use existing vco if
> encoder does not return a new vco value. check_patch.pl cleanup
> V6: simplify logic in intel_modeset_checks.
> V7: reorder an IF for readability and whitespace fix.
> V8: use dev_cdclk for tracking new cdclk during atomic
> V9: correctly handle vco 8640 when crtcs==0
> V10: Clean up if else in crtcs==0
> V11: Rebase for new intel_dpll_mgr.c
>
> Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Is the r-b from Ville really for v11?
-Daniel
> Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 +-
> drivers/gpu/drm/i915/intel_display.c | 111 ++++++++++++++++++++++++++++-----
> drivers/gpu/drm/i915/intel_dpll_mgr.c | 9 +--
> drivers/gpu/drm/i915/intel_drv.h | 5 ++
> 4 files changed, 106 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 80b14f1..bf87e62 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1759,7 +1759,7 @@ struct drm_i915_private {
> int num_fence_regs; /* 8 on pre-965, 16 otherwise */
>
> unsigned int fsb_freq, mem_freq, is_ddr3;
> - unsigned int skl_boot_cdclk;
> + unsigned int skl_vco_freq;
> unsigned int cdclk_freq, max_cdclk_freq, atomic_cdclk_freq;
> unsigned int max_dotclk_freq;
> unsigned int rawclk_freq;
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index ce55f0b..fc5268c 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5584,7 +5584,7 @@ static unsigned int skl_cdclk_decimal(unsigned int freq)
> return (freq - 1000) / 500;
> }
>
> -static unsigned int skl_cdclk_get_vco(unsigned int freq)
> +unsigned int skl_cdclk_get_vco(unsigned int freq)
> {
> unsigned int i;
>
> @@ -5742,17 +5742,21 @@ void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
>
> void skl_init_cdclk(struct drm_i915_private *dev_priv)
> {
> - unsigned int required_vco;
> + unsigned int cdclk;
>
> /* DPLL0 not enabled (happens on early BIOS versions) */
> if (!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_ENABLE)) {
> /* enable DPLL0 */
> - required_vco = skl_cdclk_get_vco(dev_priv->skl_boot_cdclk);
> - skl_dpll0_enable(dev_priv, required_vco);
> + if (dev_priv->skl_vco_freq != 8640)
> + dev_priv->skl_vco_freq = 8100;
> + skl_dpll0_enable(dev_priv, dev_priv->skl_vco_freq);
> + cdclk = ((dev_priv->skl_vco_freq == 8100) ? 337500 : 308570);
> + } else {
> + cdclk = dev_priv->cdclk_freq;
> }
>
> - /* set CDCLK to the frequency the BIOS chose */
> - skl_set_cdclk(dev_priv, dev_priv->skl_boot_cdclk);
> + /* set CDCLK to the lowest frequency, Modeset follows */
> + skl_set_cdclk(dev_priv, cdclk);
>
> /* enable DBUF power */
> I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) | DBUF_POWER_REQUEST);
> @@ -5768,7 +5772,7 @@ int skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
> {
> uint32_t lcpll1 = I915_READ(LCPLL1_CTL);
> uint32_t cdctl = I915_READ(CDCLK_CTL);
> - int freq = dev_priv->skl_boot_cdclk;
> + int freq = dev_priv->cdclk_freq;
>
> /*
> * check if the pre-os intialized the display
> @@ -5792,11 +5796,7 @@ int skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
> /* All well; nothing to sanitize */
> return false;
> sanitize:
> - /*
> - * As of now initialize with max cdclk till
> - * we get dynamic cdclk support
> - * */
> - dev_priv->skl_boot_cdclk = dev_priv->max_cdclk_freq;
> +
> skl_init_cdclk(dev_priv);
>
> /* we did have to sanitize */
> @@ -9753,6 +9753,73 @@ static void broadwell_modeset_commit_cdclk(struct drm_atomic_state *old_state)
> broadwell_set_cdclk(dev, req_cdclk);
> }
>
> +static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
> +{
> + struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
> + struct drm_i915_private *dev_priv = to_i915(state->dev);
> + const int max_pixclk = ilk_max_pixel_rate(state);
> + int cdclk;
> +
> + /*
> + * FIXME should also account for plane ratio
> + * once 64bpp pixel formats are supported.
> + */
> +
> + if (intel_state->cdclk_pll_vco == 8640) {
> + /* vco 8640 */
> + if (max_pixclk > 540000)
> + cdclk = 617140;
> + else if (max_pixclk > 432000)
> + cdclk = 540000;
> + else if (max_pixclk > 308570)
> + cdclk = 432000;
> + else
> + cdclk = 308570;
> + } else {
> + /* VCO 8100 */
> + if (max_pixclk > 540000)
> + cdclk = 675000;
> + else if (max_pixclk > 450000)
> + cdclk = 540000;
> + else if (max_pixclk > 337500)
> + cdclk = 450000;
> + else
> + cdclk = 337500;
> + }
> +
> + /*
> + * FIXME move the cdclk caclulation to
> + * compute_config() so we can fail gracegully.
> + */
> + if (cdclk > dev_priv->max_cdclk_freq) {
> + DRM_ERROR("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
> + cdclk, dev_priv->max_cdclk_freq);
> + cdclk = dev_priv->max_cdclk_freq;
> + }
> +
> + intel_state->cdclk = intel_state->dev_cdclk = cdclk;
> + if (!intel_state->active_crtcs)
> + intel_state->dev_cdclk = ((intel_state->cdclk_pll_vco == 8640) ?
> + 308570 : 337500);
> +
> +
> + return 0;
> +}
> +
> +static void skl_modeset_commit_cdclk(struct drm_atomic_state *old_state)
> +{
> + struct drm_device *dev = old_state->dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + unsigned int req_cdclk = to_intel_atomic_state(old_state)->dev_cdclk;
> +
> + /*
> + * FIXME disable/enable PLL should wrap set_cdclk()
> + */
> + skl_set_cdclk(dev_priv, req_cdclk);
> +
> + dev_priv->skl_vco_freq = to_intel_atomic_state(old_state)->cdclk_pll_vco;
> +}
> +
> static int haswell_crtc_compute_clock(struct intel_crtc *crtc,
> struct intel_crtc_state *crtc_state)
> {
> @@ -13214,9 +13281,15 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
> * adjusted_mode bits in the crtc directly.
> */
> if (dev_priv->display.modeset_calc_cdclk) {
> + if (!intel_state->cdclk_pll_vco)
> + intel_state->cdclk_pll_vco = dev_priv->skl_vco_freq;
> +
> ret = dev_priv->display.modeset_calc_cdclk(state);
> + if (ret < 0)
> + return ret;
>
> - if (!ret && intel_state->dev_cdclk != dev_priv->cdclk_freq)
> + if (intel_state->dev_cdclk != dev_priv->cdclk_freq ||
> + intel_state->cdclk_pll_vco != dev_priv->skl_vco_freq)
> ret = intel_modeset_all_pipes(state);
>
> if (ret < 0)
> @@ -13588,7 +13661,8 @@ static int intel_atomic_commit(struct drm_device *dev,
> drm_atomic_helper_update_legacy_modeset_state(state->dev, state);
>
> if (dev_priv->display.modeset_commit_cdclk &&
> - intel_state->dev_cdclk != dev_priv->cdclk_freq)
> + (intel_state->dev_cdclk != dev_priv->cdclk_freq ||
> + intel_state->cdclk_pll_vco != dev_priv->skl_vco_freq))
> dev_priv->display.modeset_commit_cdclk(state);
> }
>
> @@ -14964,8 +15038,12 @@ static void intel_init_display(struct drm_device *dev)
> broxton_modeset_commit_cdclk;
> dev_priv->display.modeset_calc_cdclk =
> broxton_modeset_calc_cdclk;
> + } else if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {
> + dev_priv->display.modeset_commit_cdclk =
> + skl_modeset_commit_cdclk;
> + dev_priv->display.modeset_calc_cdclk =
> + skl_modeset_calc_cdclk;
> }
> -
> switch (INTEL_INFO(dev)->gen) {
> case 2:
> dev_priv->display.queue_flip = intel_gen2_queue_flip;
> @@ -15672,7 +15750,8 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
> if (crtc_state->base.active) {
> dev_priv->active_crtcs |= 1 << crtc->pipe;
>
> - if (IS_BROADWELL(dev_priv)) {
> + if (IS_BROADWELL(dev_priv) || IS_SKYLAKE(dev_priv) ||
> + IS_KABYLAKE(dev_priv)) {
> pixclk = ilk_pipe_pixel_rate(crtc_state);
>
> /* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
> diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> index 4b636c4..a5642b1 100644
> --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> @@ -1183,6 +1183,7 @@ skl_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
> struct intel_shared_dpll *pll;
> uint32_t ctrl1, cfgcr1, cfgcr2;
> int clock = crtc_state->port_clock;
> + uint32_t vco = 8100;
>
> /*
> * See comment in intel_dpll_hw_state to understand why we always use 0
> @@ -1225,17 +1226,17 @@ skl_get_dpll(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state,
> case 162000:
> ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1620, 0);
> break;
> - /* TBD: For DP link rates 2.16 GHz and 4.32 GHz, VCO is 8640 which
> - results in CDCLK change. Need to handle the change of CDCLK by
> - disabling pipes and re-enabling them */
> case 108000:
> ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080, 0);
> + vco = 8640;
> break;
> case 216000:
> ctrl1 |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2160, 0);
> + vco = 8640;
> break;
> }
>
> + to_intel_atomic_state(crtc_state->base.state)->cdclk_pll_vco = vco;
> cfgcr1 = cfgcr2 = 0;
> } else {
> return NULL;
> @@ -1628,7 +1629,7 @@ static void intel_ddi_pll_init(struct drm_device *dev)
> int cdclk_freq;
>
> cdclk_freq = dev_priv->display.get_display_clock_speed(dev);
> - dev_priv->skl_boot_cdclk = cdclk_freq;
> + dev_priv->skl_vco_freq = skl_cdclk_get_vco(cdclk_freq);
> if (skl_sanitize_cdclk(dev_priv))
> DRM_DEBUG_KMS("Sanitized cdclk programmed by pre-os\n");
> if (!(I915_READ(LCPLL1_CTL) & LCPLL_PLL_ENABLE))
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 02b3d22..b23b129 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -301,6 +301,10 @@ struct intel_atomic_state {
> * don't bother calculating intermediate watermarks.
> */
> bool skip_intermediate_wm;
> +
> + /* SKL/KBL Only */
> + unsigned int cdclk_pll_vco;
> +
> };
>
> struct intel_plane_state {
> @@ -1239,6 +1243,7 @@ void bxt_disable_dc9(struct drm_i915_private *dev_priv);
> void skl_init_cdclk(struct drm_i915_private *dev_priv);
> int skl_sanitize_cdclk(struct drm_i915_private *dev_priv);
> void skl_uninit_cdclk(struct drm_i915_private *dev_priv);
> +unsigned int skl_cdclk_get_vco(unsigned int freq);
> void skl_enable_dc6(struct drm_i915_private *dev_priv);
> void skl_disable_dc6(struct drm_i915_private *dev_priv);
> void intel_dp_get_m_n(struct intel_crtc *crtc,
> --
> 1.7.9.5
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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