[Intel-gfx] [PATCH 03/10] drm/i915/dvo/sil164: Fix suspend/resume

[Jani Nikula]

On Tue, 22 Nov 2022, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> Poke a few more bits into the SiI164 to make it
> recover after S3. HEN/VEN are the important bits,
> the rest PLL filter/HPD detection I just did
> for good measure to match the BIOS programming.
>
> Note that the spec recommended SCNT bit in REGC
> isn't set by the BIOS at least for me, so I left
> it out.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Acked-by: Jani Nikula <jani.nikula at intel.com>

> ---
>  drivers/gpu/drm/i915/display/dvo_sil164.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/dvo_sil164.c b/drivers/gpu/drm/i915/display/dvo_sil164.c
> index 32dd3b969946..4acc8ce29c0b 100644
> --- a/drivers/gpu/drm/i915/display/dvo_sil164.c
> +++ b/drivers/gpu/drm/i915/display/dvo_sil164.c
> @@ -58,6 +58,10 @@ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
>  #define SIL164_9_MDI (1<<0)
>  
>  #define SIL164_REGC 0x0c
> +#define SIL164_C_SCNT (1<<7)
> +#define SIL164_C_PLLF_MASK (0xf<<1)
> +#define SIL164_C_PLLF_REC (4<<1)
> +#define SIL164_C_PFEN (1<<0)
>  
>  struct sil164_priv {
>  	//I2CDevRec d;
> @@ -205,6 +209,13 @@ static void sil164_mode_set(struct intel_dvo_device *dvo,
>  	  sil164_writeb(sil, 0x0c, 0x89);
>  	  sil164_writeb(sil, 0x08, 0x31);*/
>  	/* don't do much */
> +
> +	sil164_writeb(dvo, SIL164_REG8,
> +		      SIL164_8_VEN | SIL164_8_HEN);
> +	sil164_writeb(dvo, SIL164_REG9,
> +		      SIL164_9_TSEL);
> +	sil164_writeb(dvo, SIL164_REGC,
> +		      SIL164_C_PLLF_REC | SIL164_C_PFEN);
>  }
>  
>  /* set the SIL164 power state */

-- 
Jani Nikula, Intel Open Source Graphics Center