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| author | Zhao Yakui <yakui.zhao@intel.com> | 2012-08-08 15:57:01 +0200 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2012-08-24 01:29:31 +0200 |
| commit | 9a9f5786fcccda3cc61eaa8f537690327eff6853 (patch) | |
| tree | 5cd213dafb3ddb148aa339d8bdc5d27c6faa2d7d /drivers/gpu/drm/gma500/cdv_intel_dp.c | |
| parent | gma500/cdv: Add eDP support (diff) | |
| download | linux-9a9f5786fcccda3cc61eaa8f537690327eff6853.tar.xz linux-9a9f5786fcccda3cc61eaa8f537690327eff6853.zip | |
gma500: Disable the clock gating of display controller to make DP/eDP work well
I don't know why the DP/eDP is affected by the clock gating. But the test
shows that it really fixes the DP/eDP clock issue during enabling DP/eDP.
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
[Updated to only apply the workaround if the device has DP. We don't want
to do this on netbooks]
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/gma500/cdv_intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/gma500/cdv_intel_dp.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/gma500/cdv_intel_dp.c b/drivers/gpu/drm/gma500/cdv_intel_dp.c index 0571ef9b889b..9bacce3ce53c 100644 --- a/drivers/gpu/drm/gma500/cdv_intel_dp.c +++ b/drivers/gpu/drm/gma500/cdv_intel_dp.c @@ -1778,6 +1778,28 @@ static bool cdv_intel_dpc_is_edp(struct drm_device *dev) return false; } +/* Cedarview display clock gating + + We need this disable dot get correct behaviour while enabling + DP/eDP. TODO - investigate if we can turn it back to normality + after enabling */ +static void cdv_disable_intel_clock_gating(struct drm_device *dev) +{ + u32 reg_value; + reg_value = REG_READ(DSPCLK_GATE_D); + + reg_value |= (DPUNIT_PIPEB_GATE_DISABLE | + DPUNIT_PIPEA_GATE_DISABLE | + DPCUNIT_CLOCK_GATE_DISABLE | + DPLSUNIT_CLOCK_GATE_DISABLE | + DPOUNIT_CLOCK_GATE_DISABLE | + DPIOUNIT_CLOCK_GATE_DISABLE); + + REG_WRITE(DSPCLK_GATE_D, reg_value); + + udelay(500); +} + void cdv_intel_dp_init(struct drm_device *dev, struct psb_intel_mode_device *mode_dev, int output_reg) { @@ -1841,6 +1863,8 @@ cdv_intel_dp_init(struct drm_device *dev, struct psb_intel_mode_device *mode_dev break; } + cdv_disable_intel_clock_gating(dev); + cdv_intel_dp_i2c_init(psb_intel_connector, psb_intel_encoder, name); /* FIXME:fail check */ cdv_intel_dp_add_properties(connector); |