From 02f4c9e02a021c5608dde7ae0607946ab16ae00c Mon Sep 17 00:00:00 2001 From: Chon Ming Lee Date: Thu, 3 Oct 2013 23:16:17 +0800 Subject: [PATCH] drm/i915/vlv: Turn off power gate for BIOS-less system. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit During system boot up, by default, the power gate for render, media and display well still power gated. Normally, BIOS will turn off the power gate. In the BIOS-less system, the driver need to turn off the power gate very early during driver load. v2: Move this to intel_uncore_sanitize to allow it to get call during resume path. (Daniel) v3: Remove redundant write 0 to DPIO_CTL, and use DPIO_RESET instead of just 0x1 (Ville) Add turn of power gate for display 2d/render well/media well. v4: Remove toggle cmnreset in intel_uncore_sanitize. Cmnreset should toggle after CRI clock source has been selected. Jesse DPIO reset patch which toggle the cmnreset in intel_modeset_init_hw() should handle it. (Ville) Signed-off-by: Chon Ming Lee Reviewed-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 9 +++++++++ drivers/gpu/drm/i915/intel_uncore.c | 16 ++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index c101743..9538502 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -361,6 +361,15 @@ #define PUNIT_OPCODE_REG_READ 6 #define PUNIT_OPCODE_REG_WRITE 7 +#define PUNIT_REG_PWRGT_CTRL 0x60 +#define PUNIT_REG_PWRGT_STATUS 0x61 +#define PUNIT_CLK_GATE 1 +#define PUNIT_PWR_RESET 2 +#define PUNIT_PWR_GATE 3 +#define RENDER_PWRGT (PUNIT_PWR_GATE << 0) +#define MEDIA_PWRGT (PUNIT_PWR_GATE << 2) +#define DISP2D_PWRGT (PUNIT_PWR_GATE << 6) + #define PUNIT_REG_GPU_LFM 0xd3 #define PUNIT_REG_GPU_FREQ_REQ 0xd4 #define PUNIT_REG_GPU_FREQ_STS 0xd8 diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index f2753d9..288a3a6 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -301,10 +301,26 @@ static void intel_uncore_forcewake_reset(struct drm_device *dev) void intel_uncore_sanitize(struct drm_device *dev) { + struct drm_i915_private *dev_priv = dev->dev_private; + u32 reg_val; + intel_uncore_forcewake_reset(dev); /* BIOS often leaves RC6 enabled, but disable it for hw init */ intel_disable_gt_powersave(dev); + + /* Turn off power gate, require especially for the BIOS less system */ + if (IS_VALLEYVIEW(dev)) { + + mutex_lock(&dev_priv->rps.hw_lock); + reg_val = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS); + + if (reg_val & (RENDER_PWRGT | MEDIA_PWRGT | DISP2D_PWRGT)) + vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, 0x0); + + mutex_unlock(&dev_priv->rps.hw_lock); + + } } /* -- 2.7.4