On Mon, 08 Feb 2021, Lyude Paul <ly...@redhat.com> wrote:
> Get rid of the extraneous switch case in here, and just open code
> edp_backlight_mode as we only ever use it once.
>
> v4:
> * Check that backlight mode is DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD, not
> DP_EDP_BACKLIGHT_CONTROL_MODE_MASK - imirkin
>
> Signed-off-by: Lyude Paul <ly...@redhat.com>
> ---
> .../gpu/drm/i915/display/intel_dp_aux_backlight.c | 15 ++-------------
> 1 file changed, 2 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> index c37ccc8538cb..57218faed4a3 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
> @@ -382,7 +382,7 @@ intel_dp_aux_vesa_enable_backlight(const struct
> intel_crtc_state *crtc_state,
> struct intel_dp *intel_dp = intel_attached_dp(connector);
> struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> struct intel_panel *panel = &connector->panel;
> - u8 dpcd_buf, new_dpcd_buf, edp_backlight_mode;
> + u8 dpcd_buf, new_dpcd_buf;
> u8 pwmgen_bit_count = panel->backlight.edp.vesa.pwmgen_bit_count;
>
> if (drm_dp_dpcd_readb(&intel_dp->aux,
> @@ -393,12 +393,8 @@ intel_dp_aux_vesa_enable_backlight(const struct
> intel_crtc_state *crtc_state,
> }
>
> new_dpcd_buf = dpcd_buf;
> - edp_backlight_mode = dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
>
> - switch (edp_backlight_mode) {
> - case DP_EDP_BACKLIGHT_CONTROL_MODE_PWM:
> - case DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET:
> - case DP_EDP_BACKLIGHT_CONTROL_MODE_PRODUCT:
> + if ((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) !=
> DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
> new_dpcd_buf &= ~DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
> new_dpcd_buf |= DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
>
> @@ -406,13 +402,6 @@ intel_dp_aux_vesa_enable_backlight(const struct
> intel_crtc_state *crtc_state,
> pwmgen_bit_count) != 1)
What baseline is this on? None that I can think of have the above != 1,
they're all < 0 AFAICT.
BR,
Jani.
> drm_dbg_kms(&i915->drm,
> "Failed to write aux pwmgen bit count\n");
> -
> - break;
> -
> - /* Do nothing when it is already DPCD mode */
> - case DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD:
> - default:
> - break;
> }
>
> if (panel->backlight.edp.vesa.pwm_freq_pre_divider) {
--
Jani Nikula, Intel Open Source Graphics Center
