>-----Original Message-----
>From: Nikula, Jani
>Sent: Friday, September 18, 2015 7:03 PM
>To: Shankar, Uma; intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>Cc: Kumar, Shobhit; Deak, Imre; Shankar, Uma
>Subject: Re: [BXT MIPI PATCH v3 12/14] drm/i915/bxt: Program Backlight PWM
>frequency
>
>On Tue, 01 Sep 2015, Uma Shankar <uma.shankar@xxxxxxxxx> wrote:
>> In some cases, BIOS doesn't initializes DSI panel.DSI and backlight
>> registers are thereby not initialized. Programming the same in driver
>> backlight setup.
>>
>> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
>
>This is probably obsolete now. See current bxt_setup_backlight.
>
>BR,
>Jani.
>
Yeah, we can drop this patch since the values will be updated in VBT. Thanks Jani for notifying.
>> ---
>> drivers/gpu/drm/i915/i915_reg.h | 3 +++
>> drivers/gpu/drm/i915/intel_panel.c | 11 +++++++++++
>> 2 files changed, 14 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h
>> b/drivers/gpu/drm/i915/i915_reg.h index 8407b5c..10f73b1 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -7166,6 +7166,9 @@ enum skl_disp_power_wells {
>> #define TRANS_MSA_12_BPC (3<<5)
>> #define TRANS_MSA_16_BPC (4<<5)
>>
>> +/* Max CDCLK freq for BXT in HZ */
>> +#define BXT_CDCLK_MAX 624000000
>> +
>> /* LCPLL Control */
>> #define LCPLL_CTL 0x130040
>> #define LCPLL_PLL_DISABLE (1<<31)
>> diff --git a/drivers/gpu/drm/i915/intel_panel.c
>> b/drivers/gpu/drm/i915/intel_panel.c
>> index 9fcf86c..8225cea 100644
>> --- a/drivers/gpu/drm/i915/intel_panel.c
>> +++ b/drivers/gpu/drm/i915/intel_panel.c
>> @@ -1427,6 +1427,17 @@ bxt_setup_backlight(struct intel_connector
>*connector, enum pipe unused)
>> panel->backlight.max = I915_READ(
>> BXT_BLC_PWM_FREQ(panel->backlight.controller));
>>
>> + if (!panel->backlight.max) {
>> + DRM_DEBUG_KMS("PWM freq not programmed by BIOS\n");
>> + DRM_DEBUG_KMS("Programming PWM freq\n");
>> +
>> + /* Max Backlight = Max CD Clock / pwm freq) */
>> + panel->backlight.max = (BXT_CDCLK_MAX /
>> + dev_priv->vbt.backlight.pwm_freq_hz);
>> + I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
>> + panel->backlight.max);
>> + }
>> +
>> val = bxt_get_backlight(connector);
>> panel->backlight.level = intel_panel_compute_brightness(connector,
>> val);
>>
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