diff options
author | Pandiyan, Dhinakaran <dhinakaran.pandiyan@intel.com> | 2017-03-07 16:12:51 -0800 |
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committer | Paulo Zanoni <paulo.r.zanoni@intel.com> | 2017-03-22 16:04:33 -0300 |
commit | 78cfa580f81e69857815c59c8908aee454726da1 (patch) | |
tree | aa1eee45e7f2462e1244a0a30aaef1fe56c82910 /drivers/gpu/drm/i915/intel_cdclk.c | |
parent | 9f7886d07f36f9be23c9bcc526b7f9dae65db8c5 (diff) |
drm/i915/glk: Apply cdclk workaround for DP audio
Implement the DP-Audio cdclk restriction for GLK, similar to what is
implemented for BDW and other GEN9 platforms. The max. pixel clock
adjustment for GLK, however factors in the 2 pixels per clock output that
GLK generates.
Separating min. cdclk and max. pixel_rate would be nicer, but let's
defer that to future and fix the GLK bug for now.
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1488931972-2865-1-git-send-email-dhinakaran.pandiyan@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_cdclk.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_cdclk.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c index c2cc33f3d888..dd350642eba1 100644 --- a/drivers/gpu/drm/i915/intel_cdclk.c +++ b/drivers/gpu/drm/i915/intel_cdclk.c @@ -1442,16 +1442,21 @@ static int bdw_adjust_min_pipe_pixel_rate(struct intel_crtc_state *crtc_state, if (IS_BROADWELL(dev_priv) && crtc_state->ips_enabled) pixel_rate = DIV_ROUND_UP(pixel_rate * 100, 95); - /* BSpec says "Do not use DisplayPort with CDCLK less than - * 432 MHz, audio enabled, port width x4, and link rate - * HBR2 (5.4 GHz), or else there may be audio corruption or - * screen corruption." + /* BSpec says "Do not use DisplayPort with CDCLK less than 432 MHz, + * audio enabled, port width x4, and link rate HBR2 (5.4 GHz), or else + * there may be audio corruption or screen corruption." This cdclk + * restriction for GLK is 316.8 MHz and since GLK can output two + * pixels per clock, the pixel rate becomes 2 * 316.8 MHz. */ if (intel_crtc_has_dp_encoder(crtc_state) && crtc_state->has_audio && crtc_state->port_clock >= 540000 && - crtc_state->lane_count == 4) - pixel_rate = max(432000, pixel_rate); + crtc_state->lane_count == 4) { + if (IS_GEMINILAKE(dev_priv)) + pixel_rate = max(2 * 316800, pixel_rate); + else + pixel_rate = max(432000, pixel_rate); + } return pixel_rate; } |