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| author | Shobhit Kumar <shobhit.kumar@intel.com> | 2013-08-27 16:12:24 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-09-04 19:34:49 +0400 |
| commit | 4ce8c9a720c566a4ce7b782ddd5df90d66f0ba85 (patch) | |
| tree | 00d1cb6d13428186ca1aad3a9a04cf324587f49b /drivers/gpu/drm/i915/intel_dsi.c | |
| parent | e9fd1c02aca7a3e00701debaca45ec7bb942050c (diff) | |
| download | linux-4ce8c9a720c566a4ce7b782ddd5df90d66f0ba85.tar.xz | |
drm/i915: Band Gap WA
Note: No one seems to have docs for this, so this patch here is just
unreviewed black magic :(
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Signed-off-by: ymohanma <yogesh.mohan.marimuthu@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
[danvet: Add note about the doc situation.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dsi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dsi.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 263c8d2603b6..674fd4989b45 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -37,6 +37,51 @@ static const struct intel_dsi_device intel_dsi_devices[] = { }; + +static void vlv_cck_modify(struct drm_i915_private *dev_priv, u32 reg, u32 val, + u32 mask) +{ + u32 tmp = vlv_cck_read(dev_priv, reg); + tmp &= ~mask; + tmp |= val; + vlv_cck_write(dev_priv, reg, tmp); +} + +static void band_gap_wa(struct drm_i915_private *dev_priv) +{ + mutex_lock(&dev_priv->dpio_lock); + + /* Enable bandgap fix in GOP driver */ + vlv_cck_modify(dev_priv, 0x6D, 0x00010000, 0x00030000); + msleep(20); + vlv_cck_modify(dev_priv, 0x6E, 0x00010000, 0x00030000); + msleep(20); + vlv_cck_modify(dev_priv, 0x6F, 0x00010000, 0x00030000); + msleep(20); + vlv_cck_modify(dev_priv, 0x00, 0x00008000, 0x00008000); + msleep(20); + vlv_cck_modify(dev_priv, 0x00, 0x00000000, 0x00008000); + msleep(20); + + /* Turn Display Trunk on */ + vlv_cck_modify(dev_priv, 0x6B, 0x00020000, 0x00030000); + msleep(20); + + vlv_cck_modify(dev_priv, 0x6C, 0x00020000, 0x00030000); + msleep(20); + + vlv_cck_modify(dev_priv, 0x6D, 0x00020000, 0x00030000); + msleep(20); + vlv_cck_modify(dev_priv, 0x6E, 0x00020000, 0x00030000); + msleep(20); + vlv_cck_modify(dev_priv, 0x6F, 0x00020000, 0x00030000); + + mutex_unlock(&dev_priv->dpio_lock); + + /* Need huge delay, otherwise clock is not stable */ + msleep(100); +} + static struct intel_dsi *intel_attached_dsi(struct drm_connector *connector) { return container_of(intel_attached_encoder(connector), @@ -310,6 +355,9 @@ static void intel_dsi_mode_set(struct intel_encoder *intel_encoder) /* Update the DSI PLL */ vlv_enable_dsi_pll(intel_encoder); + /* XXX: Location of the call */ + band_gap_wa(dev_priv); + /* escape clock divider, 20MHz, shared for A and C. device ready must be * off when doing this! txclkesc? */ tmp = I915_READ(MIPI_CTRL(0)); |