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

["Kannan, Vandana" <vandana.kannan@intel.com>]

Hi Daniel,

Is there any other change required in this patch to consider before merge?
Please let me know.

- Vandana

On 7/3/2015 10:23 AM, Kannan, Vandana wrote:
> Hi,
>
> Any other review comments on this patch? Do let me know.
> Siva and Sonika have given their R-b.
>
> Thanks,
> Vandana
>
> On 7/1/2015 4:41 PM, Sivakumar Thulasimani wrote:
>> 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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