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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>
This commit is contained in:
Shobhit Kumar 2013-08-27 15:12:24 +03:00 committed by Daniel Vetter
parent e9fd1c02ac
commit 4ce8c9a720
1 changed files with 48 additions and 0 deletions
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48
drivers/gpu/drm/i915/intel_dsi.c
View File

@ -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));