Re: [PATCH v3] drm/i915/bxt: BUNs related to port PLL

[Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>]

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thanks for the changes.

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>



On 7/1/2015 5:02 PM, Vandana Kannan wrote:
> This patch contains changes based on 2 updates to the spec:
> Port PLL VCO restriction raised up to 6700.
> Port PLL now needs DCO amp override enable for all VCO frequencies.
>
> v2: Sonika's review comment addressed
> 	- dcoampovr_en_h variable not required
> Based on a discussion with Siva, the following changes have been made.
> 	- replace dco_amp var with #define BXT_DCO_AMPLITUDE
> 	- set pll10 in a single assignment
>
> v3:
> Move DCO amplitude default value to i915_reg.h. Suggested by Siva.
>
> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
> Reviewed-by: Sonika Jindal <sonika.jindal@intel.com> [v2]
> ---
>   drivers/gpu/drm/i915/i915_reg.h      |  1 +
>   drivers/gpu/drm/i915/intel_ddi.c     | 15 +++++----------
>   drivers/gpu/drm/i915/intel_display.c |  2 +-
>   3 files changed, 7 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index ac985c5..d1b8928 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1211,6 +1211,7 @@ enum skl_disp_power_wells {
>   #define  PORT_PLL_LOCK_THRESHOLD_MASK	0xe
>   /* PORT_PLL_10_A */
>   #define  PORT_PLL_DCO_AMP_OVR_EN_H	(1<<27)
> +#define  PORT_PLL_DCO_AMP_DEFAULT	15
>   #define  PORT_PLL_DCO_AMP_MASK		0x3c00
>   #define  PORT_PLL_DCO_AMP(x)		(x<<10)
>   #define _PORT_PLL_BASE(port)		_PORT3(port, _PORT_PLL_0_A,	\
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 42c1487..9c05cc0 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1455,7 +1455,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>   	struct bxt_clk_div clk_div = {0};
>   	int vco = 0;
>   	uint32_t prop_coef, int_coef, gain_ctl, targ_cnt;
> -	uint32_t dcoampovr_en_h, dco_amp, lanestagger;
> +	uint32_t lanestagger;
>   
>   	if (intel_encoder->type == INTEL_OUTPUT_HDMI) {
>   		intel_clock_t best_clock;
> @@ -1494,9 +1494,7 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>   		vco = clock * 10 / 2 * clk_div.p1 * clk_div.p2;
>   	}
>   
> -	dco_amp = 15;
> -	dcoampovr_en_h = 0;
> -	if (vco >= 6200000 && vco <= 6480000) {
> +	if (vco >= 6200000 && vco <= 6700000) {
>   		prop_coef = 4;
>   		int_coef = 9;
>   		gain_ctl = 3;
> @@ -1507,8 +1505,6 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>   		int_coef = 11;
>   		gain_ctl = 3;
>   		targ_cnt = 9;
> -		if (vco >= 4800000 && vco < 5400000)
> -			dcoampovr_en_h = 1;
>   	} else if (vco == 5400000) {
>   		prop_coef = 3;
>   		int_coef = 8;
> @@ -1550,10 +1546,9 @@ bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>   
>   	crtc_state->dpll_hw_state.pll8 = targ_cnt;
>   
> -	if (dcoampovr_en_h)
> -		crtc_state->dpll_hw_state.pll10 = PORT_PLL_DCO_AMP_OVR_EN_H;
> -
> -	crtc_state->dpll_hw_state.pll10 |= PORT_PLL_DCO_AMP(dco_amp);
> +	crtc_state->dpll_hw_state.pll10 =
> +		PORT_PLL_DCO_AMP(PORT_PLL_DCO_AMP_DEFAULT)
> +		| PORT_PLL_DCO_AMP_OVR_EN_H;
>   
>   	crtc_state->dpll_hw_state.pcsdw12 =
>   		LANESTAGGER_STRAP_OVRD | lanestagger;
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index eb665d7..e04be45 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -409,7 +409,7 @@ static const intel_limit_t intel_limits_chv = {
>   static const intel_limit_t intel_limits_bxt = {
>   	/* FIXME: find real dot limits */
>   	.dot = { .min = 0, .max = INT_MAX },
> -	.vco = { .min = 4800000, .max = 6480000 },
> +	.vco = { .min = 4800000, .max = 6700000 },
>   	.n = { .min = 1, .max = 1 },
>   	.m1 = { .min = 2, .max = 2 },
>   	/* FIXME: find real m2 limits */

-- 
regards,
Sivakumar


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