[Intel-gfx] [PATCH 4/9] drm/i915: fixup g4x pll limits

[Damien Lespiau]

On Tue, May 21, 2013 at 09:54:54PM +0200, Daniel Vetter wrote:
> Again the same confusion that our code expects m1/m2 in register values.
> This time around with the added fun that many of the existing values
> have been all off by a bit in different directions. Hence extract a
> common #define.
> 
> Note that n limits differ between lvds and other outputs. Strangely they've
> all been correct already.
> 
> v2: Rebased on top of the DP pll rework, which makes it even more
> obvious that we can do this ...

I'm a bit confused by this one:

  - I don't seem to find the special LVDS limits for n
  - Those limits are gated by a IS_G4X(). IS_G4X() is true for eaglelake
    and cantiga. The docs single out Cantiga and we seem to need a
    different set of limits for that platform (compared to the rest of
    gen4) platforms?
  - The limits for n are 3-6 or 3-5 in this code but I read 3-8 and 5-6
    (cantiga)
  - m doesn't seem to match what I have, it seems like it could be the
    cantiga values (except that m is in "formula space" so we don't
    substract 2)
  - m1 and m2 seem to match what I have for cantiga, are we supposed to
    have those limits for eaglelake as well?

Well, the only conclusion is that I must be reading the wrong docs, or?

> 
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 20 ++++++++------------
>  1 file changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index ea8eb0c..cb54131 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -136,14 +136,16 @@ static const intel_limit_t intel_limits_i9xx_lvds = {
>  		.p2_slow = 14, .p2_fast = 7 },
>  };
>  
> +#define G4X_DPLL_M_LIMITS \
> +	.m = { .min = 104, .max = 138 },\
> +	.m1 = { .min = 15, .max = 21 },\
> +	.m2 = { .min = 3, .max = 11 },
>  
>  static const intel_limit_t intel_limits_g4x_sdvo = {
>  	.dot = { .min = 25000, .max = 270000 },
>  	.vco = { .min = 1750000, .max = 3500000},
>  	.n = { .min = 1, .max = 4 },
> -	.m = { .min = 104, .max = 138 },
> -	.m1 = { .min = 17, .max = 23 },
> -	.m2 = { .min = 5, .max = 11 },
> +	G4X_DPLL_M_LIMITS
>  	.p = { .min = 10, .max = 30 },
>  	.p1 = { .min = 1, .max = 3},
>  	.p2 = { .dot_limit = 270000,
> @@ -156,9 +158,7 @@ static const intel_limit_t intel_limits_g4x_hdmi = {
>  	.dot = { .min = 22000, .max = 400000 },
>  	.vco = { .min = 1750000, .max = 3500000},
>  	.n = { .min = 1, .max = 4 },
> -	.m = { .min = 104, .max = 138 },
> -	.m1 = { .min = 16, .max = 23 },
> -	.m2 = { .min = 5, .max = 11 },
> +	G4X_DPLL_M_LIMITS
>  	.p = { .min = 5, .max = 80 },
>  	.p1 = { .min = 1, .max = 8},
>  	.p2 = { .dot_limit = 165000,
> @@ -169,9 +169,7 @@ static const intel_limit_t intel_limits_g4x_single_channel_lvds = {
>  	.dot = { .min = 20000, .max = 115000 },
>  	.vco = { .min = 1750000, .max = 3500000 },
>  	.n = { .min = 1, .max = 3 },
> -	.m = { .min = 104, .max = 138 },
> -	.m1 = { .min = 17, .max = 23 },
> -	.m2 = { .min = 5, .max = 11 },
> +	G4X_DPLL_M_LIMITS
>  	.p = { .min = 28, .max = 112 },
>  	.p1 = { .min = 2, .max = 8 },
>  	.p2 = { .dot_limit = 0,
> @@ -183,9 +181,7 @@ static const intel_limit_t intel_limits_g4x_dual_channel_lvds = {
>  	.dot = { .min = 80000, .max = 224000 },
>  	.vco = { .min = 1750000, .max = 3500000 },
>  	.n = { .min = 1, .max = 3 },
> -	.m = { .min = 104, .max = 138 },
> -	.m1 = { .min = 17, .max = 23 },
> -	.m2 = { .min = 5, .max = 11 },
> +	G4X_DPLL_M_LIMITS
>  	.p = { .min = 14, .max = 42 },
>  	.p1 = { .min = 2, .max = 6 },
>  	.p2 = { .dot_limit = 0,
> -- 
> 1.7.11.7
> 
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