Re: [PATCH v2] drm/i915/bxt: BUNs related to port PLL

Kannan, Vandana
2015-07-01T10:42:30Z

On 7/1/2015 3:48 PM, Sivakumar Thulasimani wrote:
>
>
> On 7/1/2015 11:04 AM, 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
>>
>> Signed-off-by: Vandana Kannan <vandana.kannan@intel.com>
>> ---
>> drivers/gpu/drm/i915/intel_ddi.c | 16 ++++++----------
>> drivers/gpu/drm/i915/intel_display.c | 2 +-
>> 2 files changed, 7 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c
>> b/drivers/gpu/drm/i915/intel_ddi.c
>> index 42c1487..1eadc14 100644
>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>> @@ -1445,6 +1445,8 @@ static const struct bxt_clk_div bxt_dp_clk_val[]
>> = {
>> {432000, 3, 1, 32, 1677722, 1, 1}
>> };
>> +#define BXT_DCO_AMPLITUDE 15
>> +
> can this be moved to i915_reg.h along with other #defines relating to
> PORT_PLL_10_A?
Hi Siva,
Since the requirement of BXT_DCO_AMPLITUDE is local to this
function/file, I added it here instead of i915_reg.h. Following the
other #defines in this file, like REF_MIN, REF_MAX.
- Vandana
>> static bool
>> bxt_ddi_pll_select(struct intel_crtc *intel_crtc,
>> struct intel_crtc_state *crtc_state,
>> @@ -1455,7 +1457,7 @@ 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 +1496,7 @@ 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 +1507,6 @@ 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 +1548,8 @@ 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(BXT_DCO_AMPLITUDE)
>> + | 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 */