From 664326f8a5b7e4ab7ed469acaadc63d2a05d8720 Mon Sep 17 00:00:00 2001 From: "A.Sunil Kamath" Date: Mon, 24 Nov 2014 13:37:44 +0530 Subject: [PATCH] drm/i915/bxt: Implement enable/disable for Display C9 state v2: Modified as per review comments from Imre - Mention enabling instead of allowing in the debug trace and remove unnecessary comments. v3: - Rebase to latest. - Move DC9-related functions from intel_display.c to intel_runtime_pm.c. v4: (imre) - remove DC5 disabling, it's a nop at this point - squashed in Suketu's "Assert the requirements to enter or exit DC9" patch - remove check for RUNTIME_PM from assert_can_enable_dc9, it's not a dependency Signed-off-by: A.Sunil Kamath (v3) Signed-off-by: Imre Deak Reviewed-by: Sagar Kamble Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 5 ++ drivers/gpu/drm/i915/intel_drv.h | 2 + drivers/gpu/drm/i915/intel_runtime_pm.c | 66 +++++++++++++++++++++++++ 3 files changed, 73 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 11b9a0898111..29c41f1bba34 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7059,6 +7059,11 @@ enum skl_disp_power_wells { #define BXT_DE_PLL_PLL_ENABLE (1 << 31) #define BXT_DE_PLL_LOCK (1 << 30) +/* GEN9 DC */ +#define DC_STATE_EN 0x45504 +#define DC_STATE_EN_UPTO_DC5 (1<<0) +#define DC_STATE_EN_DC9 (1<<3) + /* Please see hsw_read_dcomp() and hsw_write_dcomp() before using this register, * since on HSW we can't write to it using I915_WRITE. */ #define D_COMP_HSW (MCHBAR_MIRROR_BASE_SNB + 0x5F0C) diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 1ae0c3a1ad0b..1cad3ddaf3c7 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1117,6 +1117,8 @@ void broxton_uninit_cdclk(struct drm_device *dev); void broxton_set_cdclk(struct drm_device *dev, int frequency); void broxton_ddi_phy_init(struct drm_device *dev); void broxton_ddi_phy_uninit(struct drm_device *dev); +void bxt_enable_dc9(struct drm_i915_private *dev_priv); +void bxt_disable_dc9(struct drm_i915_private *dev_priv); void intel_dp_get_m_n(struct intel_crtc *crtc, struct intel_crtc_state *pipe_config); void intel_dp_set_m_n(struct intel_crtc *crtc, enum link_m_n_set m_n); diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index ff5cce32c7d6..8fe2fdeab652 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -351,6 +351,72 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv, BXT_DISPLAY_POWERWELL_2_POWER_DOMAINS)) | \ BIT(POWER_DOMAIN_INIT)) +static void assert_can_enable_dc9(struct drm_i915_private *dev_priv) +{ + struct drm_device *dev = dev_priv->dev; + + WARN(!IS_BROXTON(dev), "Platform doesn't support DC9.\n"); + WARN((I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9), + "DC9 already programmed to be enabled.\n"); + WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5, + "DC5 still not disabled to enable DC9.\n"); + WARN(I915_READ(HSW_PWR_WELL_DRIVER), "Power well on.\n"); + WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n"); + + /* + * TODO: check for the following to verify the conditions to enter DC9 + * state are satisfied: + * 1] Check relevant display engine registers to verify if mode set + * disable sequence was followed. + * 2] Check if display uninitialize sequence is initialized. + */ +} + +static void assert_can_disable_dc9(struct drm_i915_private *dev_priv) +{ + WARN(intel_irqs_enabled(dev_priv), "Interrupts not disabled yet.\n"); + WARN(!(I915_READ(DC_STATE_EN) & DC_STATE_EN_DC9), + "DC9 already programmed to be disabled.\n"); + WARN(I915_READ(DC_STATE_EN) & DC_STATE_EN_UPTO_DC5, + "DC5 still not disabled.\n"); + + /* + * TODO: check for the following to verify DC9 state was indeed + * entered before programming to disable it: + * 1] Check relevant display engine registers to verify if mode + * set disable sequence was followed. + * 2] Check if display uninitialize sequence is initialized. + */ +} + +void bxt_enable_dc9(struct drm_i915_private *dev_priv) +{ + uint32_t val; + + assert_can_enable_dc9(dev_priv); + + DRM_DEBUG_KMS("Enabling DC9\n"); + + val = I915_READ(DC_STATE_EN); + val |= DC_STATE_EN_DC9; + I915_WRITE(DC_STATE_EN, val); + POSTING_READ(DC_STATE_EN); +} + +void bxt_disable_dc9(struct drm_i915_private *dev_priv) +{ + uint32_t val; + + assert_can_disable_dc9(dev_priv); + + DRM_DEBUG_KMS("Disabling DC9\n"); + + val = I915_READ(DC_STATE_EN); + val &= ~DC_STATE_EN_DC9; + I915_WRITE(DC_STATE_EN, val); + POSTING_READ(DC_STATE_EN); +} + static void skl_set_power_well(struct drm_i915_private *dev_priv, struct i915_power_well *power_well, bool enable) { -- 2.20.1