From f7044dd904d7a97967af097515da272fa89b00e9 Mon Sep 17 00:00:00 2001 From: Madhav Chauhan Date: Fri, 2 Dec 2016 10:23:53 +0200 Subject: [PATCH] drm/i915/glk: Update Port PLL enable sequence for Geminilkae Add steps for enabling and disabling Port PLL as per bspec. Signed-off-by: Madhav Chauhan Signed-off-by: Ander Conselvan de Oliveira Reviewed-by: Rodrigo Vivi Link: http://patchwork.freedesktop.org/patch/msgid/1480667037-11215-6-git-send-email-ander.conselvan.de.oliveira@intel.com --- drivers/gpu/drm/i915/i915_reg.h | 2 ++ drivers/gpu/drm/i915/intel_dpll_mgr.c | 20 ++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 6cff01debe72..90685d235410 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1574,6 +1574,8 @@ enum skl_disp_power_wells { #define PORT_PLL_ENABLE (1 << 31) #define PORT_PLL_LOCK (1 << 30) #define PORT_PLL_REF_SEL (1 << 27) +#define PORT_PLL_POWER_ENABLE (1 << 26) +#define PORT_PLL_POWER_STATE (1 << 25) #define BXT_PORT_PLL_ENABLE(port) _MMIO_PORT(port, _PORT_PLL_A, _PORT_PLL_B) #define _PORT_PLL_EBB_0_A 0x162034 diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c index 63104b7a1bcf..97f7cc9b58ee 100644 --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c @@ -1380,6 +1380,16 @@ static void bxt_ddi_pll_enable(struct drm_i915_private *dev_priv, temp |= PORT_PLL_REF_SEL; I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp); + if (IS_GEMINILAKE(dev_priv)) { + temp = I915_READ(BXT_PORT_PLL_ENABLE(port)); + temp |= PORT_PLL_POWER_ENABLE; + I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp); + + if (wait_for_us((I915_READ(BXT_PORT_PLL_ENABLE(port)) & + PORT_PLL_POWER_STATE), 200)) + DRM_ERROR("Power state not set for PLL:%d\n", port); + } + /* Disable 10 bit clock */ temp = I915_READ(BXT_PORT_PLL_EBB_4(phy, ch)); temp &= ~PORT_PLL_10BIT_CLK_ENABLE; @@ -1485,6 +1495,16 @@ static void bxt_ddi_pll_disable(struct drm_i915_private *dev_priv, temp &= ~PORT_PLL_ENABLE; I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp); POSTING_READ(BXT_PORT_PLL_ENABLE(port)); + + if (IS_GEMINILAKE(dev_priv)) { + temp = I915_READ(BXT_PORT_PLL_ENABLE(port)); + temp &= ~PORT_PLL_POWER_ENABLE; + I915_WRITE(BXT_PORT_PLL_ENABLE(port), temp); + + if (wait_for_us(!(I915_READ(BXT_PORT_PLL_ENABLE(port)) & + PORT_PLL_POWER_STATE), 200)) + DRM_ERROR("Power state not reset for PLL:%d\n", port); + } } static bool bxt_ddi_pll_get_hw_state(struct drm_i915_private *dev_priv, -- 2.20.1