[Intel-gfx] [PATCH 15/18] drm/i915/hsw+: Add has_fuses power well attribute
Ville Syrjälä
ville.syrjala at linux.intel.com
Tue Jul 11 17:05:39 UTC 2017
On Thu, Jul 06, 2017 at 05:40:37PM +0300, Imre Deak wrote:
> The pattern of a power well backing a set of fuses whose initialization
> we need to wait for during power well enabling is common to all GEN9+
> platforms. Adding support for this to the HSW power well enable helper
> allows us to use the HSW/BDW power well code for GEN9+ as well in a
> follow-up patch.
>
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
> drivers/gpu/drm/i915/gvt/display.c | 6 +++---
> drivers/gpu/drm/i915/i915_drv.h | 1 +
> drivers/gpu/drm/i915/i915_reg.h | 8 ++++----
> drivers/gpu/drm/i915/intel_runtime_pm.c | 34 ++++++++++++++++++++++++++-------
> 4 files changed, 35 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c
> index 2deb05f..13599bb 100644
> --- a/drivers/gpu/drm/i915/gvt/display.c
> +++ b/drivers/gpu/drm/i915/gvt/display.c
> @@ -178,9 +178,9 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
> SDE_PORTE_HOTPLUG_SPT);
> vgpu_vreg(vgpu, SKL_FUSE_STATUS) |=
> SKL_FUSE_DOWNLOAD_STATUS |
> - SKL_FUSE_PG0_DIST_STATUS |
> - SKL_FUSE_PG1_DIST_STATUS |
> - SKL_FUSE_PG2_DIST_STATUS;
> + SKL_FUSE_PG_DIST_STATUS(0) |
> + SKL_FUSE_PG_DIST_STATUS(1) |
> + SKL_FUSE_PG_DIST_STATUS(2);
> vgpu_vreg(vgpu, LCPLL1_CTL) |=
> LCPLL_PLL_ENABLE |
> LCPLL_PLL_LOCK;
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index dc5ca5a..9e97536 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1396,6 +1396,7 @@ struct i915_power_well {
> u32 irq_pipe_mask;
> /* The pw is backing the VGA functionality */
> bool has_vga:1;
> + bool has_fuses:1;
> } hsw;
> };
> const struct i915_power_well_ops *ops;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 845f50c..794d65c 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8023,10 +8023,10 @@ enum {
>
> /* SKL Fuse Status */
> #define SKL_FUSE_STATUS _MMIO(0x42000)
> -#define SKL_FUSE_DOWNLOAD_STATUS (1<<31)
> -#define SKL_FUSE_PG0_DIST_STATUS (1<<27)
> -#define SKL_FUSE_PG1_DIST_STATUS (1<<26)
> -#define SKL_FUSE_PG2_DIST_STATUS (1<<25)
> +#define SKL_FUSE_DOWNLOAD_STATUS (1<<31)
> +/* PG0 (HW control->no power well ID), PG1..PG2 (SKL_DISP_PW1..SKL_DISP_PW2) */
> +#define SKL_PW_TO_PG(pw) ((pw) - SKL_DISP_PW_1 + 1)
> +#define SKL_FUSE_PG_DIST_STATUS(pg) (1 << (27 - (pg)))
>
> /* Per-pipe DDI Function Control */
> #define _TRANS_DDI_FUNC_CTL_A 0x60400
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 14d4ff4..c204be0 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -400,16 +400,36 @@ static void hsw_wait_for_power_well_disable(struct drm_i915_private *dev_priv,
> !!(reqs & 1), !!(reqs & 2), !!(reqs & 4), !!(reqs & 8));
> }
>
> +static void gen9_wait_for_power_well_fuses(struct drm_i915_private *dev_priv,
> + int pg)
> +{
> + /* Timeout 5us for PG#0, for other PGs 1us */
> + WARN_ON(intel_wait_for_register(dev_priv, SKL_FUSE_STATUS,
> + SKL_FUSE_PG_DIST_STATUS(pg),
> + SKL_FUSE_PG_DIST_STATUS(pg), 1));
> +}
> +
> static void hsw_power_well_enable(struct drm_i915_private *dev_priv,
> struct i915_power_well *power_well)
> {
> enum i915_power_well_id id = power_well->id;
> + bool wait_fuses = power_well->hsw.has_fuses;
> + int pg;
> u32 val;
>
> + if (wait_fuses) {
> + pg = SKL_PW_TO_PG(id);
> + if (pg == 1)
> + gen9_wait_for_power_well_fuses(dev_priv, pg - 1);
> + }
This part looks magicy. The macro adds 1, but here you have to subtract
1 when feeding it the value, which seems odd. And apparently 1 is somehow
special, but I can't tell why.
> +
> val = I915_READ(HSW_PWR_WELL_DRIVER);
> I915_WRITE(HSW_PWR_WELL_DRIVER, val | HSW_PWR_WELL_CTL_REQ(id));
> hsw_wait_for_power_well_enable(dev_priv, power_well);
>
> + if (wait_fuses)
> + gen9_wait_for_power_well_fuses(dev_priv, pg);
> +
> hsw_power_well_post_enable(dev_priv, power_well->hsw.irq_pipe_mask,
> power_well->hsw.has_vga);
> }
> @@ -810,15 +830,15 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
> case SKL_DISP_PW_1:
> if (intel_wait_for_register(dev_priv,
> SKL_FUSE_STATUS,
> - SKL_FUSE_PG0_DIST_STATUS,
> - SKL_FUSE_PG0_DIST_STATUS,
> + SKL_FUSE_PG_DIST_STATUS(0),
> + SKL_FUSE_PG_DIST_STATUS(0),
> 1)) {
> DRM_ERROR("PG0 not enabled\n");
> return;
> }
> break;
> case SKL_DISP_PW_2:
> - if (!(fuse_status & SKL_FUSE_PG1_DIST_STATUS)) {
> + if (!(fuse_status & SKL_FUSE_PG_DIST_STATUS(1))) {
> DRM_ERROR("PG1 in disabled state\n");
> return;
> }
> @@ -863,15 +883,15 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv,
> if (power_well->id == SKL_DISP_PW_1) {
> if (intel_wait_for_register(dev_priv,
> SKL_FUSE_STATUS,
> - SKL_FUSE_PG1_DIST_STATUS,
> - SKL_FUSE_PG1_DIST_STATUS,
> + SKL_FUSE_PG_DIST_STATUS(1),
> + SKL_FUSE_PG_DIST_STATUS(1),
> 1))
> DRM_ERROR("PG1 distributing status timeout\n");
> } else if (power_well->id == SKL_DISP_PW_2) {
> if (intel_wait_for_register(dev_priv,
> SKL_FUSE_STATUS,
> - SKL_FUSE_PG2_DIST_STATUS,
> - SKL_FUSE_PG2_DIST_STATUS,
> + SKL_FUSE_PG_DIST_STATUS(2),
> + SKL_FUSE_PG_DIST_STATUS(2),
> 1))
> DRM_ERROR("PG2 distributing status timeout\n");
> }
> --
> 2.7.4
>
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> Intel-gfx at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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