From 1881a4234ef03751daf55b62b17e6bb0dbf7792a Mon Sep 17 00:00:00 2001 From: Uma Shankar Date: Wed, 25 Jan 2017 19:43:23 +0530 Subject: [PATCH] drm/i915: Add MIPI_IO WA and program DSI regulators Enable MIPI IO WA for BXT DSI as per bspec and program the DSI regulators. v2: Moved IO enable to pre-enable as per Mika's review comments. Also reused the existing register definition for BXT_P_CR_GT_DISP_PWRON. v3: Added Programming the DSI regulators as per disable/enable sequences. v4: Restricting regulator changes to BXT as suggested by Jani/Mika v5: Removed redundant read/modify for regulator register as per Jani's comment. Maintain enable/disable symmetry as per spec. Signed-off-by: Uma Shankar Signed-off-by: Vidya Srinivas Acked-by: Mika Kahola Reviewed-by: Jani Nikula Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/1485353603-11260-1-git-send-email-vidya.srinivas@intel.com --- drivers/gpu/drm/i915/i915_reg.h | 7 +++++++ drivers/gpu/drm/i915/intel_dsi.c | 24 ++++++++++++++++++++++++ 2 files changed, 31 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 02a65dd..a9538ae 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1552,6 +1552,7 @@ enum skl_disp_power_wells { _MMIO(_BXT_PHY_CH(phy, ch, reg_ch0, reg_ch1)) #define BXT_P_CR_GT_DISP_PWRON _MMIO(0x138090) +#define MIPIO_RST_CTRL (1 << 2) #define _BXT_PHY_CTL_DDI_A 0x64C00 #define _BXT_PHY_CTL_DDI_B 0x64C10 @@ -8361,6 +8362,12 @@ enum { #define _BXT_MIPIC_PORT_CTRL 0x6B8C0 #define BXT_MIPI_PORT_CTRL(tc) _MMIO_MIPI(tc, _BXT_MIPIA_PORT_CTRL, _BXT_MIPIC_PORT_CTRL) +#define BXT_P_DSI_REGULATOR_CFG _MMIO(0x160020) +#define STAP_SELECT (1 << 0) + +#define BXT_P_DSI_REGULATOR_TX_CTRL _MMIO(0x160054) +#define HS_IO_CTRL_SELECT (1 << 0) + #define DPI_ENABLE (1 << 31) /* A + C */ #define MIPIA_MIPI4DPHY_DELAY_COUNT_SHIFT 27 #define MIPIA_MIPI4DPHY_DELAY_COUNT_MASK (0xf << 27) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 16732e7..c98234e 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -548,6 +548,7 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder, struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); enum port port; + u32 val; DRM_DEBUG_KMS("\n"); @@ -558,6 +559,17 @@ static void intel_dsi_pre_enable(struct intel_encoder *encoder, intel_disable_dsi_pll(encoder); intel_enable_dsi_pll(encoder, pipe_config); + if (IS_BROXTON(dev_priv)) { + /* Add MIPI IO reset programming for modeset */ + val = I915_READ(BXT_P_CR_GT_DISP_PWRON); + I915_WRITE(BXT_P_CR_GT_DISP_PWRON, + val | MIPIO_RST_CTRL); + + /* Power up DSI regulator */ + I915_WRITE(BXT_P_DSI_REGULATOR_CFG, STAP_SELECT); + I915_WRITE(BXT_P_DSI_REGULATOR_TX_CTRL, 0); + } + intel_dsi_prepare(encoder, pipe_config); /* Panel Enable over CRC PMIC */ @@ -707,6 +719,7 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder, { struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); + u32 val; DRM_DEBUG_KMS("\n"); @@ -714,6 +727,17 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder, intel_dsi_clear_device_ready(encoder); + if (IS_BROXTON(dev_priv)) { + /* Power down DSI regulator to save power */ + I915_WRITE(BXT_P_DSI_REGULATOR_CFG, STAP_SELECT); + I915_WRITE(BXT_P_DSI_REGULATOR_TX_CTRL, HS_IO_CTRL_SELECT); + + /* Add MIPI IO reset programming for modeset */ + val = I915_READ(BXT_P_CR_GT_DISP_PWRON); + I915_WRITE(BXT_P_CR_GT_DISP_PWRON, + val & ~MIPIO_RST_CTRL); + } + intel_disable_dsi_pll(encoder); if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) { -- 2.7.4