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author | Uma Shankar <uma.shankar@intel.com> | 2019-02-11 19:20:21 +0530 |
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committer | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2019-02-13 11:25:14 +0100 |
commit | 8957129cb3b0144aceb46b8002cb5d1c45326b01 (patch) | |
tree | c23157f4e24e2e6771b001f35c771dd4d546634e /drivers/gpu/drm/i915/intel_color.c | |
parent | b3b0391af2afa783841fb70eaa715b8a79a17d99 (diff) | |
download | linux-stable-8957129cb3b0144aceb46b8002cb5d1c45326b01.tar.gz linux-stable-8957129cb3b0144aceb46b8002cb5d1c45326b01.tar.bz2 linux-stable-8957129cb3b0144aceb46b8002cb5d1c45326b01.zip |
drm/i915/glk: Fix degamma lut programming
Fixed the glk degamma lut programming which currently
was hard coding a linear lut all the time, making degamma
block of glk basically a pass through.
Currently degamma lut for glk is assigned as 0 in platform
configuration. Updated the same to 33 as per the hardware
capability. IGT tests for degamma were getting skipped due to
this, spotted by Swati.
ToDo: The current gamma/degamm lut ABI has just 16bit for each
color component. This is not enough for GLK+, since input
precision is increased to 3.16 which will need 19bit entries.
v2: Added Matt's RB.
v3: Changed uint32_t to u32.
v4: Fixed Maarten's review comment
Credits-to: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1549893025-21837-2-git-send-email-uma.shankar@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_color.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_color.c | 62 |
1 files changed, 34 insertions, 28 deletions
diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c index c0e2806febf6..e39189928e10 100644 --- a/drivers/gpu/drm/i915/intel_color.c +++ b/drivers/gpu/drm/i915/intel_color.c @@ -489,6 +489,12 @@ static void bdw_load_gamma_lut(const struct intel_crtc_state *crtc_state, u32 of I915_WRITE(PREC_PAL_GC_MAX(pipe, 1), (1 << 16) - 1); I915_WRITE(PREC_PAL_GC_MAX(pipe, 2), (1 << 16) - 1); } + + /* + * Reset the index, otherwise it prevents the legacy palette to be + * written properly. + */ + I915_WRITE(PREC_PAL_INDEX(pipe), 0); } /* Loads the palette/gamma unit for the CRTC on Broadwell+. */ @@ -496,7 +502,6 @@ static void broadwell_load_luts(const struct intel_crtc_state *crtc_state) { struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc); struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); - enum pipe pipe = crtc->pipe; if (crtc_state_is_legacy_gamma(crtc_state)) { i9xx_load_luts(crtc_state); @@ -504,12 +509,6 @@ static void broadwell_load_luts(const struct intel_crtc_state *crtc_state) bdw_load_degamma_lut(crtc_state); bdw_load_gamma_lut(crtc_state, INTEL_INFO(dev_priv)->color.degamma_lut_size); - - /* - * Reset the index, otherwise it prevents the legacy palette to be - * written properly. - */ - I915_WRITE(PREC_PAL_INDEX(pipe), 0); } } @@ -518,7 +517,7 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state) struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc); struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); enum pipe pipe = crtc->pipe; - const u32 lut_size = 33; + const u32 lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size; u32 i; /* @@ -529,14 +528,32 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state) I915_WRITE(PRE_CSC_GAMC_INDEX(pipe), 0); I915_WRITE(PRE_CSC_GAMC_INDEX(pipe), PRE_CSC_GAMC_AUTO_INCREMENT); - /* - * FIXME: The pipe degamma table in geminilake doesn't support - * different values per channel, so this just loads a linear table. - */ - for (i = 0; i < lut_size; i++) { - u32 v = (i * (1 << 16)) / (lut_size - 1); + if (crtc_state->base.degamma_lut) { + struct drm_color_lut *lut = crtc_state->base.degamma_lut->data; + + for (i = 0; i < lut_size; i++) { + /* + * First 33 entries represent range from 0 to 1.0 + * 34th and 35th entry will represent extended range + * inputs 3.0 and 7.0 respectively, currently clamped + * at 1.0. Since the precision is 16bit, the user + * value can be directly filled to register. + * The pipe degamma table in GLK+ onwards doesn't + * support different values per channel, so this just + * programs green value which will be equal to Red and + * Blue into the lut registers. + * ToDo: Extend to max 7.0. Enable 32 bit input value + * as compared to just 16 to achieve this. + */ + I915_WRITE(PRE_CSC_GAMC_DATA(pipe), lut[i].green); + } + } else { + /* load a linear table. */ + for (i = 0; i < lut_size; i++) { + u32 v = (i * (1 << 16)) / (lut_size - 1); - I915_WRITE(PRE_CSC_GAMC_DATA(pipe), v); + I915_WRITE(PRE_CSC_GAMC_DATA(pipe), v); + } } /* Clamp values > 1.0. */ @@ -546,23 +563,12 @@ static void glk_load_degamma_lut(const struct intel_crtc_state *crtc_state) static void glk_load_luts(const struct intel_crtc_state *crtc_state) { - struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc); - struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); - enum pipe pipe = crtc->pipe; - glk_load_degamma_lut(crtc_state); - if (crtc_state_is_legacy_gamma(crtc_state)) { + if (crtc_state_is_legacy_gamma(crtc_state)) i9xx_load_luts(crtc_state); - } else { + else bdw_load_gamma_lut(crtc_state, 0); - - /* - * Reset the index, otherwise it prevents the legacy palette to be - * written properly. - */ - I915_WRITE(PREC_PAL_INDEX(pipe), 0); - } } static void cherryview_load_luts(const struct intel_crtc_state *crtc_state) |