drm/i915: Add LVDS support for IGDNG

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

2 files changed, 114 insertions, 26 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 53cf6efa67b6..05bd97e3e3e0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1542,6 +1542,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
         int pch_fp_reg = (pipe == 0) ? PCH_FPA0 : PCH_FPB0;
         int pch_dpll_reg = (pipe == 0) ? PCH_DPLL_A : PCH_DPLL_B;
         int fdi_rx_reg = (pipe == 0) ? FDI_RXA_CTL : FDI_RXB_CTL;
+        int lvds_reg = LVDS;
         u32 temp;
         int sdvo_pixel_multiply;
 
@@ -1772,8 +1773,12 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
          * things on.
          */
         if (is_lvds) {
-                u32 lvds = I915_READ(LVDS);
+                u32 lvds;
 
+                if (IS_IGDNG(dev))
+                        lvds_reg = PCH_LVDS;
+
+                lvds = I915_READ(lvds_reg);
                 lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP | LVDS_PIPEB_SELECT;
                 /* Set the B0-B3 data pairs corresponding to whether we're going to
                  * set the DPLLs for dual-channel mode or not.
@@ -1788,8 +1793,8 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                  * panels behave in the two modes.
                  */
 
-                I915_WRITE(LVDS, lvds);
-                I915_READ(LVDS);
+                I915_WRITE(lvds_reg, lvds);
+                I915_READ(lvds_reg);
         }
 
         I915_WRITE(fp_reg, fp);
@@ -2428,7 +2433,7 @@ static void intel_setup_outputs(struct drm_device *dev)
         intel_crt_init(dev);
 
         /* Set up integrated LVDS */
-        if (IS_MOBILE(dev) && !IS_I830(dev) && !IS_IGDNG(dev))
+        if (IS_MOBILE(dev) && !IS_I830(dev))
                 intel_lvds_init(dev);
 
         if (IS_IGDNG(dev)) {
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 53731f0ffcb5..eea3a548b82a 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -45,10 +45,15 @@
 static void intel_lvds_set_backlight(struct drm_device *dev, int level)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
-        u32 blc_pwm_ctl;
+        u32 blc_pwm_ctl, reg;
 
-        blc_pwm_ctl = I915_READ(BLC_PWM_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
-        I915_WRITE(BLC_PWM_CTL, (blc_pwm_ctl |
+        if (IS_IGDNG(dev))
+                reg = BLC_PWM_CPU_CTL;
+        else
+                reg = BLC_PWM_CTL;
+
+        blc_pwm_ctl = I915_READ(reg) & ~BACKLIGHT_DUTY_CYCLE_MASK;
+        I915_WRITE(reg, (blc_pwm_ctl |
                                  (level << BACKLIGHT_DUTY_CYCLE_SHIFT)));
 }
 
@@ -58,8 +63,14 @@ static void intel_lvds_set_backlight(struct drm_device *dev, int level)
 static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 reg;
+
+        if (IS_IGDNG(dev))
+                reg = BLC_PWM_PCH_CTL2;
+        else
+                reg = BLC_PWM_CTL;
 
-        return ((I915_READ(BLC_PWM_CTL) & BACKLIGHT_MODULATION_FREQ_MASK) >>
+        return ((I915_READ(reg) & BACKLIGHT_MODULATION_FREQ_MASK) >>
                 BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
 }
 
@@ -69,23 +80,31 @@ static u32 intel_lvds_get_max_backlight(struct drm_device *dev)
 static void intel_lvds_set_power(struct drm_device *dev, bool on)
 {
         struct drm_i915_private *dev_priv = dev->dev_private;
-        u32 pp_status;
+        u32 pp_status, ctl_reg, status_reg;
+
+        if (IS_IGDNG(dev)) {
+                ctl_reg = PCH_PP_CONTROL;
+                status_reg = PCH_PP_STATUS;
+        } else {
+                ctl_reg = PP_CONTROL;
+                status_reg = PP_STATUS;
+        }
 
         if (on) {
-                I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) |
+                I915_WRITE(ctl_reg, I915_READ(ctl_reg) |
                            POWER_TARGET_ON);
                 do {
-                        pp_status = I915_READ(PP_STATUS);
+                        pp_status = I915_READ(status_reg);
                 } while ((pp_status & PP_ON) == 0);
 
                 intel_lvds_set_backlight(dev, dev_priv->backlight_duty_cycle);
         } else {
                 intel_lvds_set_backlight(dev, 0);
 
-                I915_WRITE(PP_CONTROL, I915_READ(PP_CONTROL) &
+                I915_WRITE(ctl_reg, I915_READ(ctl_reg) &
                            ~POWER_TARGET_ON);
                 do {
-                        pp_status = I915_READ(PP_STATUS);
+                        pp_status = I915_READ(status_reg);
                 } while (pp_status & PP_ON);
         }
 }
@@ -106,12 +125,28 @@ static void intel_lvds_save(struct drm_connector *connector)
 {
         struct drm_device *dev = connector->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
+        u32 pwm_ctl_reg;
+
+        if (IS_IGDNG(dev)) {
+                pp_on_reg = PCH_PP_ON_DELAYS;
+                pp_off_reg = PCH_PP_OFF_DELAYS;
+                pp_ctl_reg = PCH_PP_CONTROL;
+                pp_div_reg = PCH_PP_DIVISOR;
+                pwm_ctl_reg = BLC_PWM_CPU_CTL;
+        } else {
+                pp_on_reg = PP_ON_DELAYS;
+                pp_off_reg = PP_OFF_DELAYS;
+                pp_ctl_reg = PP_CONTROL;
+                pp_div_reg = PP_DIVISOR;
+                pwm_ctl_reg = BLC_PWM_CTL;
+        }
 
-        dev_priv->savePP_ON = I915_READ(PP_ON_DELAYS);
-        dev_priv->savePP_OFF = I915_READ(PP_OFF_DELAYS);
-        dev_priv->savePP_CONTROL = I915_READ(PP_CONTROL);
-        dev_priv->savePP_DIVISOR = I915_READ(PP_DIVISOR);
-        dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
+        dev_priv->savePP_ON = I915_READ(pp_on_reg);
+        dev_priv->savePP_OFF = I915_READ(pp_off_reg);
+        dev_priv->savePP_CONTROL = I915_READ(pp_ctl_reg);
+        dev_priv->savePP_DIVISOR = I915_READ(pp_div_reg);
+        dev_priv->saveBLC_PWM_CTL = I915_READ(pwm_ctl_reg);
         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
                                        BACKLIGHT_DUTY_CYCLE_MASK);
 
@@ -127,12 +162,28 @@ static void intel_lvds_restore(struct drm_connector *connector)
 {
         struct drm_device *dev = connector->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 pp_on_reg, pp_off_reg, pp_ctl_reg, pp_div_reg;
+        u32 pwm_ctl_reg;
+
+        if (IS_IGDNG(dev)) {
+                pp_on_reg = PCH_PP_ON_DELAYS;
+                pp_off_reg = PCH_PP_OFF_DELAYS;
+                pp_ctl_reg = PCH_PP_CONTROL;
+                pp_div_reg = PCH_PP_DIVISOR;
+                pwm_ctl_reg = BLC_PWM_CPU_CTL;
+        } else {
+                pp_on_reg = PP_ON_DELAYS;
+                pp_off_reg = PP_OFF_DELAYS;
+                pp_ctl_reg = PP_CONTROL;
+                pp_div_reg = PP_DIVISOR;
+                pwm_ctl_reg = BLC_PWM_CTL;
+        }
 
-        I915_WRITE(BLC_PWM_CTL, dev_priv->saveBLC_PWM_CTL);
-        I915_WRITE(PP_ON_DELAYS, dev_priv->savePP_ON);
-        I915_WRITE(PP_OFF_DELAYS, dev_priv->savePP_OFF);
-        I915_WRITE(PP_DIVISOR, dev_priv->savePP_DIVISOR);
-        I915_WRITE(PP_CONTROL, dev_priv->savePP_CONTROL);
+        I915_WRITE(pwm_ctl_reg, dev_priv->saveBLC_PWM_CTL);
+        I915_WRITE(pp_on_reg, dev_priv->savePP_ON);
+        I915_WRITE(pp_off_reg, dev_priv->savePP_OFF);
+        I915_WRITE(pp_div_reg, dev_priv->savePP_DIVISOR);
+        I915_WRITE(pp_ctl_reg, dev_priv->savePP_CONTROL);
         if (dev_priv->savePP_CONTROL & POWER_TARGET_ON)
                 intel_lvds_set_power(dev, true);
         else
@@ -216,8 +267,14 @@ static void intel_lvds_prepare(struct drm_encoder *encoder)
 {
         struct drm_device *dev = encoder->dev;
         struct drm_i915_private *dev_priv = dev->dev_private;
+        u32 reg;
 
-        dev_priv->saveBLC_PWM_CTL = I915_READ(BLC_PWM_CTL);
+        if (IS_IGDNG(dev))
+                reg = BLC_PWM_CPU_CTL;
+        else
+                reg = BLC_PWM_CTL;
+
+        dev_priv->saveBLC_PWM_CTL = I915_READ(reg);
         dev_priv->backlight_duty_cycle = (dev_priv->saveBLC_PWM_CTL &
                                        BACKLIGHT_DUTY_CYCLE_MASK);
 
@@ -251,6 +308,10 @@ static void intel_lvds_mode_set(struct drm_encoder *encoder,
          * settings.
          */
 
+        /* No panel fitting yet, fixme */
+        if (IS_IGDNG(dev))
+                return;
+
         /*
          * Enable automatic panel scaling so that non-native modes fill the
          * screen.  Should be enabled before the pipe is enabled, according to
@@ -446,12 +507,18 @@ void intel_lvds_init(struct drm_device *dev)
         struct drm_display_mode *scan; /* *modes, *bios_mode; */
         struct drm_crtc *crtc;
         u32 lvds;
-        int pipe;
+        int pipe, gpio = GPIOC;
 
         /* Skip init on machines we know falsely report LVDS */
         if (dmi_check_system(intel_no_lvds))
                 return;
 
+        if (IS_IGDNG(dev)) {
+                if ((I915_READ(PCH_LVDS) & LVDS_DETECTED) == 0)
+                        return;
+                gpio = PCH_GPIOC;
+        }
+
         intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL);
         if (!intel_output) {
                 return;
@@ -486,7 +553,7 @@ void intel_lvds_init(struct drm_device *dev)
          */
 
         /* Set up the DDC bus. */
-        intel_output->ddc_bus = intel_i2c_create(dev, GPIOC, "LVDSDDC_C");
+        intel_output->ddc_bus = intel_i2c_create(dev, gpio, "LVDSDDC_C");
         if (!intel_output->ddc_bus) {
                 dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
                            "failed.\n");
@@ -528,6 +595,11 @@ void intel_lvds_init(struct drm_device *dev)
          * on.  If so, assume that whatever is currently programmed is the
          * correct mode.
          */
+
+        /* IGDNG: FIXME if still fail, not try pipe mode now */
+        if (IS_IGDNG(dev))
+                goto failed;
+
         lvds = I915_READ(LVDS);
         pipe = (lvds & LVDS_PIPEB_SELECT) ? 1 : 0;
         crtc = intel_get_crtc_from_pipe(dev, pipe);
@@ -546,6 +618,17 @@ void intel_lvds_init(struct drm_device *dev)
                 goto failed;
 
 out:
+        if (IS_IGDNG(dev)) {
+                u32 pwm;
+                /* make sure PWM is enabled */
+                pwm = I915_READ(BLC_PWM_CPU_CTL2);
+                pwm |= (PWM_ENABLE | PWM_PIPE_B);
+                I915_WRITE(BLC_PWM_CPU_CTL2, pwm);
+
+                pwm = I915_READ(BLC_PWM_PCH_CTL1);
+                pwm |= PWM_PCH_ENABLE;
+                I915_WRITE(BLC_PWM_PCH_CTL1, pwm);
+        }
         drm_sysfs_connector_add(connector);
         return;