drm/i915/dsi: Use a fuzzy check for burst mode clock check

[thirdparty/kernel/stable.git] / drivers / gpu / drm / i915 / intel_dsi_vbt.c

diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
index fbed9064ac7eba0c00fc2b268c2be3345a0e1f3c..7cdde1d04f4baf389f8507454681d9581844db4a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -858,6 +858,17 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
                if (mipi_config->target_burst_mode_freq) {
                        u32 bitrate = intel_dsi_bitrate(intel_dsi);
 
+                       /*
+                        * Sometimes the VBT contains a slightly lower clock,
+                        * then the bitrate we have calculated, in this case
+                        * just replace it with the calculated bitrate.
+                        */
+                       if (mipi_config->target_burst_mode_freq < bitrate &&
+                           intel_fuzzy_clock_check(
+                                       mipi_config->target_burst_mode_freq,
+                                       bitrate))
+                               mipi_config->target_burst_mode_freq = bitrate;
+
                        if (mipi_config->target_burst_mode_freq < bitrate) {
                                DRM_ERROR("Burst mode freq is less than computed\n");
                                return false;