[Intel-gfx] [PATCH 2/2]IGD: workaround i2c bus issue in gfx driver side

[Zhenyu Wang]

On 2009.03.16 14:45:28 +0800, Shaohua Li wrote:
> In IGD, DPCUNIT_CLOCK_GATE_DISABLE bit should be set, otherwise i2c
> access will be wrong.
> 
> Signed-off-by: Shaohua Li <shaohua.li at intel.com>
> ---
>  src/i830_driver.c |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> Index: xf86_video_intel/src/i830_driver.c
> ===================================================================
> --- xf86_video_intel.orig/src/i830_driver.c
> +++ xf86_video_intel/src/i830_driver.c
> @@ -1057,6 +1057,11 @@ I830PreInitDDC(ScrnInfoPtr pScrn)
>  	 pI830->ddc2 = FALSE;
>        }
>     }
> +
> +  if (IS_IGD(pI830)) {
> +        /* Driver is using bit bashing for I2C, this bit should be set to 1 */
> +        OUTREG(DSPCLK_GATE_D, INREG(DSPCLK_GATE_D) | DPCUNIT_CLOCK_GATE_DISABLE);
> +    }
>  }
>  
>  static void

Looks this should be in i830_init_clock_gating(), and KMS needs to be ported as well. 

-- 
Open Source Technology Center, Intel ltd.

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