[Intel-gfx] [PATCH] drm/i915/snps: use div32 version of MPLLB word clock for UHBR

[Ville Syrjälä]

On Thu, Dec 02, 2021 at 04:44:56PM +0200, Jani Nikula wrote:
> The mode set sequence for 128b/132b requires setting the div32 version
> of MPLLB clock.
> 
> Bspec: 53880, 54128

Weird place for that information when all the other bits are listed
in the clock programming section :/

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

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_snps_phy.c | 2 ++
>  drivers/gpu/drm/i915/i915_reg.h               | 1 +
>  2 files changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_snps_phy.c b/drivers/gpu/drm/i915/display/intel_snps_phy.c
> index c2251218a39e..09f405e4d363 100644
> --- a/drivers/gpu/drm/i915/display/intel_snps_phy.c
> +++ b/drivers/gpu/drm/i915/display/intel_snps_phy.c
> @@ -186,6 +186,7 @@ static const struct intel_mpllb_state dg2_dp_uhbr10_100 = {
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_PMIX_EN, 1) |
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_WORD_DIV2_EN, 1) |
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_DP2_MODE, 1) |
> +		REG_FIELD_PREP(SNPS_PHY_MPLLB_SHIM_DIV32_CLK_SEL, 1) |
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_V2I, 2),
>  	.mpllb_div2 =
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_REF_CLK_DIV, 2) |
> @@ -369,6 +370,7 @@ static const struct intel_mpllb_state dg2_dp_uhbr10_38_4 = {
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_PMIX_EN, 1) |
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_WORD_DIV2_EN, 1) |
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_DP2_MODE, 1) |
> +		REG_FIELD_PREP(SNPS_PHY_MPLLB_SHIM_DIV32_CLK_SEL, 1) |
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_V2I, 2),
>  	.mpllb_div2 =
>  		REG_FIELD_PREP(SNPS_PHY_MPLLB_REF_CLK_DIV, 1) |
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 3450818802c2..1fad1d593e13 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2265,6 +2265,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>  #define   SNPS_PHY_MPLLB_DP2_MODE		REG_BIT(9)
>  #define   SNPS_PHY_MPLLB_WORD_DIV2_EN		REG_BIT(8)
>  #define   SNPS_PHY_MPLLB_TX_CLK_DIV		REG_GENMASK(7, 5)
> +#define   SNPS_PHY_MPLLB_SHIM_DIV32_CLK_SEL	REG_BIT(0)
>  
>  #define SNPS_PHY_MPLLB_FRACN1(phy)		_MMIO_SNPS(phy, 0x168008)
>  #define   SNPS_PHY_MPLLB_FRACN_EN		REG_BIT(31)
> -- 
> 2.30.2

-- 
Ville Syrjälä
Intel