From 555e38d2731720a8eacc0463a26bdd74315d2d63 Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Fri, 9 Jun 2017 15:26:02 -0700 Subject: [PATCH] drm/i915/cnl: DDI - PLL mapping MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit One of the steps for PLL (un)initialization is to (un)map the correspondent DDI that is actually using that PLL. So, let's do this step following the places already stablished and used so far, although spec put this as part of PLL initialization sequences. v2: Use proper prefix on bits names as suggested by Ander. v3: Add missed "~". Without that the logic was inverted so we were disabling interrupts. Credits-to: Clinton Credits-to: Art v4: Spec is getting updated to do DDI -> PLL mapping and clock on in 2 separated reg writes. (Paulo) Also update bits definitions to use space (1 << 1) instead of (1<<1). (Paulo) Cc: Paulo Zanoni Cc: Art Runyan Cc: Clint Taylor Cc: Ville Syrjälä Cc: Kahola, Mika Cc: Ander Conselvan De Oliveira Signed-off-by: Rodrigo Vivi Reviewed-by: Kahola, Mika Signed-off-by: Rodrigo Vivi Link: http://patchwork.freedesktop.org/patch/msgid/1497047175-27250-5-git-send-email-rodrigo.vivi@intel.com --- drivers/gpu/drm/i915/i915_reg.h | 9 +++++++++ drivers/gpu/drm/i915/intel_ddi.c | 23 ++++++++++++++++++++--- 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 539e44e88e01b..f9e329ada437c 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -8134,6 +8134,15 @@ enum { #define DPLL_CFGCR1(id) _MMIO_PIPE((id) - SKL_DPLL1, _DPLL1_CFGCR1, _DPLL2_CFGCR1) #define DPLL_CFGCR2(id) _MMIO_PIPE((id) - SKL_DPLL1, _DPLL1_CFGCR2, _DPLL2_CFGCR2) +/* + * CNL Clocks + */ +#define DPCLKA_CFGCR0 _MMIO(0x6C200) +#define DPCLKA_CFGCR0_DDI_CLK_OFF(port) (1 << ((port)+10)) +#define DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port) (3 << ((port)*2)) +#define DPCLKA_CFGCR0_DDI_CLK_SEL_SHIFT(port) ((port)*2) +#define DPCLKA_CFGCR0_DDI_CLK_SEL(pll, port) ((pll) << ((port)*2)) + /* BXT display engine PLL */ #define BXT_DE_PLL_CTL _MMIO(0x6d000) #define BXT_DE_PLL_RATIO(x) (x) /* {60,65,100} * 19.2MHz */ diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 2d35d97d170eb..62a623e72fe2d 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -1621,13 +1621,27 @@ static void intel_ddi_clk_select(struct intel_encoder *encoder, { struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); enum port port = intel_ddi_get_encoder_port(encoder); + uint32_t val; if (WARN_ON(!pll)) return; - if (IS_GEN9_BC(dev_priv)) { - uint32_t val; + if (IS_CANNONLAKE(dev_priv)) { + /* Configure DPCLKA_CFGCR0 to map the DPLL to the DDI. */ + val = I915_READ(DPCLKA_CFGCR0); + val |= DPCLKA_CFGCR0_DDI_CLK_SEL(pll->id, port); + I915_WRITE(DPCLKA_CFGCR0, val); + /* + * Configure DPCLKA_CFGCR0 to turn on the clock for the DDI. + * This step and the step before must be done with separate + * register writes. + */ + val = I915_READ(DPCLKA_CFGCR0); + val &= ~(DPCLKA_CFGCR0_DDI_CLK_OFF(port) | + DPCLKA_CFGCR0_DDI_CLK_SEL_MASK(port)); + I915_WRITE(DPCLKA_CFGCR0, val); + } else if (IS_GEN9_BC(dev_priv)) { /* DDI -> PLL mapping */ val = I915_READ(DPLL_CTRL2); @@ -1767,7 +1781,10 @@ static void intel_ddi_post_disable(struct intel_encoder *intel_encoder, if (dig_port) intel_display_power_put(dev_priv, dig_port->ddi_io_power_domain); - if (IS_GEN9_BC(dev_priv)) + if (IS_CANNONLAKE(dev_priv)) + I915_WRITE(DPCLKA_CFGCR0, I915_READ(DPCLKA_CFGCR0) | + DPCLKA_CFGCR0_DDI_CLK_OFF(port)); + else if (IS_GEN9_BC(dev_priv)) I915_WRITE(DPLL_CTRL2, (I915_READ(DPLL_CTRL2) | DPLL_CTRL2_DDI_CLK_OFF(port))); else if (INTEL_GEN(dev_priv) < 9) -- 2.39.5