Re: [PATCH] drm/i915: Only enable DDI IO power domains after enabling DPLL

Ville Syrjälä
2017-02-27T20:38:50Z

On Fri, Feb 24, 2017 at 04:19:59PM +0200, Ander Conselvan de Oliveira wrote:
> According to bspec, the DDI IO power domains should be enabled after
> enabling the DPLL and mapping it to the DDI. The current order doesn't
> seem to create problems with Skylake and Kabylake, but causes enable
> timeouts in Geminilake.

This one seems to kill SKL+MST.

Just load the driver with an MST display plugged in and we get:
[ 79.389527] Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception handler

So presumably we're trying to access something that's not powered/clocked
and the CPU just gets totally stuck.

>
> v2: Rebase.
> - Take power domain references before sanitizing encoders. (Imre)
> - Add comment to get_encoder_power_domains() defition. (Ander)
>
> v3: Don't put the domain if called with HSW/BDW's analog encoder. (CI)
>
> v4: Put IO power domain before unmapping DPLL. (Imre)
> - Change return type of intel_ddi_get_power_domains() to u64. (Imre)
>
> Cc: David Weinehall <david.weinehall@linux.intel.com>
> Cc: Imre Deak <imre.deak@intel.com>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
> Reviewed-by: David Weinehall <david.weinehall@linux.intel.com> # v1
> Reviewed-by: Imre Deak <imre.deak@intel.com>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 5 +++
> drivers/gpu/drm/i915/intel_ddi.c | 49 ++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_display.c | 20 ++++++++++
> drivers/gpu/drm/i915/intel_drv.h | 4 ++
> drivers/gpu/drm/i915/intel_runtime_pm.c | 68 +++++++++++++++++++--------------
> 5 files changed, 117 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 4673912..5a032ba 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -344,6 +344,11 @@ enum intel_display_power_domain {
> POWER_DOMAIN_PORT_DDI_C_LANES,
> POWER_DOMAIN_PORT_DDI_D_LANES,
> POWER_DOMAIN_PORT_DDI_E_LANES,
> + POWER_DOMAIN_PORT_DDI_A_IO,
> + POWER_DOMAIN_PORT_DDI_B_IO,
> + POWER_DOMAIN_PORT_DDI_C_IO,
> + POWER_DOMAIN_PORT_DDI_D_IO,
> + POWER_DOMAIN_PORT_DDI_E_IO,
> POWER_DOMAIN_PORT_DSI,
> POWER_DOMAIN_PORT_CRT,
> POWER_DOMAIN_PORT_OTHER,
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index b0c4d23..e9013f1 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1440,6 +1440,17 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
> return ret;
> }
>
> +static u64 intel_ddi_get_power_domains(struct intel_encoder *encoder)
> +{
> + struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
> + enum pipe pipe;
> +
> + if (intel_ddi_get_hw_state(encoder, &pipe))
> + return BIT_ULL(dig_port->ddi_io_power_domain);
> +
> + return 0;
> +}
> +
> void intel_ddi_enable_pipe_clock(struct intel_crtc *intel_crtc)
> {
> struct drm_crtc *crtc = &intel_crtc->base;
> @@ -1682,6 +1693,7 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
> struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> enum port port = intel_ddi_get_encoder_port(encoder);
> + struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
>
> intel_dp_set_link_params(intel_dp, link_rate, lane_count,
> link_mst);
> @@ -1689,6 +1701,9 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
> intel_edp_panel_on(intel_dp);
>
> intel_ddi_clk_select(encoder, pll);
> +
> + intel_display_power_get(dev_priv, dig_port->ddi_io_power_domain);
> +
> intel_prepare_dp_ddi_buffers(encoder);
> intel_ddi_init_dp_buf_reg(encoder);
> intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
> @@ -1708,9 +1723,13 @@ static void intel_ddi_pre_enable_hdmi(struct intel_encoder *encoder,
> struct drm_encoder *drm_encoder = &encoder->base;
> enum port port = intel_ddi_get_encoder_port(encoder);
> int level = intel_ddi_hdmi_level(dev_priv, port);
> + struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
>
> intel_dp_dual_mode_set_tmds_output(intel_hdmi, true);
> intel_ddi_clk_select(encoder, pll);
> +
> + intel_display_power_get(dev_priv, dig_port->ddi_io_power_domain);
> +
> intel_prepare_hdmi_ddi_buffers(encoder);
> if (IS_GEN9_BC(dev_priv))
> skl_ddi_set_iboost(encoder, level);
> @@ -1754,6 +1773,7 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
> struct drm_encoder *encoder = &intel_encoder->base;
> struct drm_i915_private *dev_priv = to_i915(encoder->dev);
> enum port port = intel_ddi_get_encoder_port(intel_encoder);
> + struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
> int type = intel_encoder->type;
> uint32_t val;
> bool wait = false;
> @@ -1782,6 +1802,9 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder,
> intel_edp_panel_off(intel_dp);
> }
>
> + if (dig_port)
> + intel_display_power_put(dev_priv, dig_port->ddi_io_power_domain);
> +
> if (IS_GEN9_BC(dev_priv))
> I915_WRITE(DPLL_CTRL2, (I915_READ(DPLL_CTRL2) |
> DPLL_CTRL2_DDI_CLK_OFF(port)));
> @@ -2190,12 +2213,38 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
> intel_encoder->get_hw_state = intel_ddi_get_hw_state;
> intel_encoder->get_config = intel_ddi_get_config;
> intel_encoder->suspend = intel_dp_encoder_suspend;
> + intel_encoder->get_power_domains = intel_ddi_get_power_domains;
>
> intel_dig_port->port = port;
> intel_dig_port->saved_port_bits = I915_READ(DDI_BUF_CTL(port)) &
> (DDI_BUF_PORT_REVERSAL |
> DDI_A_4_LANES);
>
> + switch (port) {
> + case PORT_A:
> + intel_dig_port->ddi_io_power_domain =
> + POWER_DOMAIN_PORT_DDI_A_IO;
> + break;
> + case PORT_B:
> + intel_dig_port->ddi_io_power_domain =
> + POWER_DOMAIN_PORT_DDI_B_IO;
> + break;
> + case PORT_C:
> + intel_dig_port->ddi_io_power_domain =
> + POWER_DOMAIN_PORT_DDI_C_IO;
> + break;
> + case PORT_D:
> + intel_dig_port->ddi_io_power_domain =
> + POWER_DOMAIN_PORT_DDI_D_IO;
> + break;
> + case PORT_E:
> + intel_dig_port->ddi_io_power_domain =
> + POWER_DOMAIN_PORT_DDI_E_IO;
> + break;
> + default:
> + MISSING_CASE(port);
> + }
> +
> /*
> * Bspec says that DDI_A_4_LANES is the only supported configuration
> * for Broxton. Yet some BIOS fail to set this bit on port A if eDP
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 010086c..7673d5d 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -15413,6 +15413,24 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
> }
> }
>
> +static void
> +get_encoder_power_domains(struct drm_i915_private *dev_priv)
> +{
> + struct intel_encoder *encoder;
> +
> + for_each_intel_encoder(&dev_priv->drm, encoder) {
> + u64 get_domains;
> + enum intel_display_power_domain domain;
> +
> + if (!encoder->get_power_domains)
> + continue;
> +
> + get_domains = encoder->get_power_domains(encoder);
> + for_each_power_domain(domain, get_domains)
> + intel_display_power_get(dev_priv, domain);
> + }
> +}
> +
> /* Scan out the current hw modeset state,
> * and sanitizes it to the current state
> */
> @@ -15428,6 +15446,8 @@ intel_modeset_setup_hw_state(struct drm_device *dev)
> intel_modeset_readout_hw_state(dev);
>
> /* HW state is read out, now we need to sanitize this mess. */
> + get_encoder_power_domains(dev_priv);
> +
> for_each_intel_encoder(dev, encoder) {
> intel_sanitize_encoder(encoder);
> }
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 97621a1..0425dbe 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -241,6 +241,9 @@ struct intel_encoder {
> * be set correctly before calling this function. */
> void (*get_config)(struct intel_encoder *,
> struct intel_crtc_state *pipe_config);
> + /* Returns a mask of power domains that need to be referenced as part
> + * of the hardware state readout code. */
> + u64 (*get_power_domains)(struct intel_encoder *encoder);
> /*
> * Called during system suspend after all pending requests for the
> * encoder are flushed (for example for DP AUX transactions) and
> @@ -1027,6 +1030,7 @@ struct intel_digital_port {
> enum irqreturn (*hpd_pulse)(struct intel_digital_port *, bool);
> bool release_cl2_override;
> uint8_t max_lanes;
> + enum intel_display_power_domain ddi_io_power_domain;
> };
>
> struct intel_dp_mst_encoder {
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 514ef56..012bc35 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -93,6 +93,16 @@ intel_display_power_domain_str(enum intel_display_power_domain domain)
> return "PORT_DDI_D_LANES";
> case POWER_DOMAIN_PORT_DDI_E_LANES:
> return "PORT_DDI_E_LANES";
> + case POWER_DOMAIN_PORT_DDI_A_IO:
> + return "PORT_DDI_A_IO";
> + case POWER_DOMAIN_PORT_DDI_B_IO:
> + return "PORT_DDI_B_IO";
> + case POWER_DOMAIN_PORT_DDI_C_IO:
> + return "PORT_DDI_C_IO";
> + case POWER_DOMAIN_PORT_DDI_D_IO:
> + return "PORT_DDI_D_IO";
> + case POWER_DOMAIN_PORT_DDI_E_IO:
> + return "PORT_DDI_E_IO";
> case POWER_DOMAIN_PORT_DSI:
> return "PORT_DSI";
> case POWER_DOMAIN_PORT_CRT:
> @@ -385,18 +395,18 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv,
> BIT_ULL(POWER_DOMAIN_AUDIO) | \
> BIT_ULL(POWER_DOMAIN_VGA) | \
> BIT_ULL(POWER_DOMAIN_INIT))
> -#define SKL_DISPLAY_DDI_A_E_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) | \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_E_LANES) | \
> +#define SKL_DISPLAY_DDI_IO_A_E_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO) | \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_E_IO) | \
> BIT_ULL(POWER_DOMAIN_INIT))
> -#define SKL_DISPLAY_DDI_B_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES) | \
> +#define SKL_DISPLAY_DDI_IO_B_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO) | \
> BIT_ULL(POWER_DOMAIN_INIT))
> -#define SKL_DISPLAY_DDI_C_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES) | \
> +#define SKL_DISPLAY_DDI_IO_C_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO) | \
> BIT_ULL(POWER_DOMAIN_INIT))
> -#define SKL_DISPLAY_DDI_D_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_D_LANES) | \
> +#define SKL_DISPLAY_DDI_IO_D_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_D_IO) | \
> BIT_ULL(POWER_DOMAIN_INIT))
> #define SKL_DISPLAY_DC_OFF_POWER_DOMAINS ( \
> SKL_DISPLAY_POWERWELL_2_POWER_DOMAINS | \
> @@ -451,12 +461,12 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv,
> BIT_ULL(POWER_DOMAIN_AUDIO) | \
> BIT_ULL(POWER_DOMAIN_VGA) | \
> BIT_ULL(POWER_DOMAIN_INIT))
> -#define GLK_DISPLAY_DDI_A_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES))
> -#define GLK_DISPLAY_DDI_B_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_B_LANES))
> -#define GLK_DISPLAY_DDI_C_POWER_DOMAINS ( \
> - BIT_ULL(POWER_DOMAIN_PORT_DDI_C_LANES))
> +#define GLK_DISPLAY_DDI_IO_A_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_A_IO))
> +#define GLK_DISPLAY_DDI_IO_B_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_B_IO))
> +#define GLK_DISPLAY_DDI_IO_C_POWER_DOMAINS ( \
> + BIT_ULL(POWER_DOMAIN_PORT_DDI_C_IO))
> #define GLK_DPIO_CMN_A_POWER_DOMAINS ( \
> BIT_ULL(POWER_DOMAIN_PORT_DDI_A_LANES) | \
> BIT_ULL(POWER_DOMAIN_AUX_A) | \
> @@ -2114,26 +2124,26 @@ static struct i915_power_well skl_power_wells[] = {
> .id = SKL_DISP_PW_2,
> },
> {
> - .name = "DDI A/E power well",
> - .domains = SKL_DISPLAY_DDI_A_E_POWER_DOMAINS,
> + .name = "DDI A/E IO power well",
> + .domains = SKL_DISPLAY_DDI_IO_A_E_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = SKL_DISP_PW_DDI_A_E,
> },
> {
> - .name = "DDI B power well",
> - .domains = SKL_DISPLAY_DDI_B_POWER_DOMAINS,
> + .name = "DDI B IO power well",
> + .domains = SKL_DISPLAY_DDI_IO_B_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = SKL_DISP_PW_DDI_B,
> },
> {
> - .name = "DDI C power well",
> - .domains = SKL_DISPLAY_DDI_C_POWER_DOMAINS,
> + .name = "DDI C IO power well",
> + .domains = SKL_DISPLAY_DDI_IO_C_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = SKL_DISP_PW_DDI_C,
> },
> {
> - .name = "DDI D power well",
> - .domains = SKL_DISPLAY_DDI_D_POWER_DOMAINS,
> + .name = "DDI D IO power well",
> + .domains = SKL_DISPLAY_DDI_IO_D_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = SKL_DISP_PW_DDI_D,
> },
> @@ -2246,20 +2256,20 @@ static struct i915_power_well glk_power_wells[] = {
> .id = GLK_DISP_PW_AUX_C,
> },
> {
> - .name = "DDI A power well",
> - .domains = GLK_DISPLAY_DDI_A_POWER_DOMAINS,
> + .name = "DDI A IO power well",
> + .domains = GLK_DISPLAY_DDI_IO_A_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = GLK_DISP_PW_DDI_A,
> },
> {
> - .name = "DDI B power well",
> - .domains = GLK_DISPLAY_DDI_B_POWER_DOMAINS,
> + .name = "DDI B IO power well",
> + .domains = GLK_DISPLAY_DDI_IO_B_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = SKL_DISP_PW_DDI_B,
> },
> {
> - .name = "DDI C power well",
> - .domains = GLK_DISPLAY_DDI_C_POWER_DOMAINS,
> + .name = "DDI C IO power well",
> + .domains = GLK_DISPLAY_DDI_IO_C_POWER_DOMAINS,
> .ops = &skl_power_well_ops,
> .id = SKL_DISP_PW_DDI_C,
> },
> --
> 2.9.3
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

--
Ville Syrjälä
Intel OTC