Commit 26eeea15 authored by Aditya Swarup's avatar Aditya Swarup Committed by Maarten Lankhorst

drm/i915/icl: Fix CRC mismatch error for DP link layer compliance

Setting the pixel rounding bit to 1 in PIPE_CHICKEN register allows
to passthrough FB pixels unmodified across pipe. This fixes the failures
for DP link layer compliance tests 4.4.1.1, 4.4.1.2 & 4.4.1.3.
(Lineage #1605353570)

v2: This is also needed to fix failing IGT test case kms_cursor_crc on
ICL.(Mika Kahola)
Make macros consistent with i915_reg.h comments.(Jani Nikula)

Cc: Clint Taylor <clinton.a.taylor@intel.com>
Cc: Mika Kahola <mika.kahola@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: default avatarAditya Swarup <aditya.swarup@intel.com>
Reviewed-by: default avatarMika Kahola <mika.kahola@intel.com>
Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190307021412.18626-1-aditya.swarup@intel.com
References: https://bugs.freedesktop.org/show_bug.cgi?id=103232
parent f4ecb8ae
...@@ -7659,12 +7659,13 @@ enum { ...@@ -7659,12 +7659,13 @@ enum {
#define GEN9_LBS_SLA_RETRY_TIMER_DECREMENT_ENABLE (1 << 2) #define GEN9_LBS_SLA_RETRY_TIMER_DECREMENT_ENABLE (1 << 2)
/*GEN11 chicken */ /*GEN11 chicken */
#define _PIPEA_CHICKEN 0x70038 #define _PIPEA_CHICKEN 0x70038
#define _PIPEB_CHICKEN 0x71038 #define _PIPEB_CHICKEN 0x71038
#define _PIPEC_CHICKEN 0x72038 #define _PIPEC_CHICKEN 0x72038
#define PER_PIXEL_ALPHA_BYPASS_EN (1 << 7) #define PIPE_CHICKEN(pipe) _MMIO_PIPE(pipe, _PIPEA_CHICKEN,\
#define PIPE_CHICKEN(pipe) _MMIO_PIPE(pipe, _PIPEA_CHICKEN,\ _PIPEB_CHICKEN)
_PIPEB_CHICKEN) #define PIXEL_ROUNDING_TRUNC_FB_PASSTHRU (1 << 15)
#define PER_PIXEL_ALPHA_BYPASS_EN (1 << 7)
/* PCH */ /* PCH */
......
...@@ -3933,7 +3933,13 @@ static void icl_set_pipe_chicken(struct intel_crtc *crtc) ...@@ -3933,7 +3933,13 @@ static void icl_set_pipe_chicken(struct intel_crtc *crtc)
* and rounding for per-pixel values 00 and 0xff * and rounding for per-pixel values 00 and 0xff
*/ */
tmp |= PER_PIXEL_ALPHA_BYPASS_EN; tmp |= PER_PIXEL_ALPHA_BYPASS_EN;
/*
* Display WA # 1605353570: icl
* Set the pixel rounding bit to 1 for allowing
* passthrough of Frame buffer pixels unmodified
* across pipe
*/
tmp |= PIXEL_ROUNDING_TRUNC_FB_PASSTHRU;
I915_WRITE(PIPE_CHICKEN(pipe), tmp); I915_WRITE(PIPE_CHICKEN(pipe), tmp);
} }
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment