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.
> ---
> 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);
>
> --
> 1.7.9.5
>
--
Jani Nikula, Intel Open Source Technology Center
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