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drm/i915/glk: Program pipe gamma and degamma tables

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The gamma tables in Geminilake were changed. There is no split-gamma
mode. Instead, there is a dedicated degamma table that is enabled
whenever pipe CSC is enabled.

The dedicated gamma table has 16 bit precision but doesn't support
separate channels. Since that doesn't match the per-channel format of
the degamma LUT property, for now only a linear table is loaded and the
property ignored.

v2: Remove empty line. (Ville)
    Reuse broadwell code. (Ville)

v3: Don't write PIPE_CSC_MODE. (Ville)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170127090230.20302-1-ander.conselvan.de.oliveira@intel.com
This commit is contained in:
Ander Conselvan de Oliveira 2017-01-27 11:02:30 +02:00
parent 2fcb206654
commit 9751bafc43
3 changed files with 72 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_pci.c
View File

@ -403,6 +403,7 @@ static const struct intel_device_info intel_geminilake_info = {
.platform = INTEL_GEMINILAKE,
.is_alpha_support = 1,
.ddb_size = 1024,
.color = { .degamma_lut_size = 0, .gamma_lut_size = 1024 }
};
static const struct intel_device_info intel_kabylake_info = {

14
drivers/gpu/drm/i915/i915_reg.h
View File

@ -8176,12 +8176,26 @@ enum {
#define _PAL_PREC_EXT_GC_MAX_A 0x4A420
#define _PAL_PREC_EXT_GC_MAX_B 0x4AC20
#define _PAL_PREC_EXT_GC_MAX_C 0x4B420
#define _PAL_PREC_EXT2_GC_MAX_A 0x4A430
#define _PAL_PREC_EXT2_GC_MAX_B 0x4AC30
#define _PAL_PREC_EXT2_GC_MAX_C 0x4B430
#define PREC_PAL_INDEX(pipe) _MMIO_PIPE(pipe, _PAL_PREC_INDEX_A, _PAL_PREC_INDEX_B)
#define PREC_PAL_DATA(pipe) _MMIO_PIPE(pipe, _PAL_PREC_DATA_A, _PAL_PREC_DATA_B)
#define PREC_PAL_GC_MAX(pipe, i) _MMIO(_PIPE(pipe, _PAL_PREC_GC_MAX_A, _PAL_PREC_GC_MAX_B) + (i) * 4)
#define PREC_PAL_EXT_GC_MAX(pipe, i) _MMIO(_PIPE(pipe, _PAL_PREC_EXT_GC_MAX_A, _PAL_PREC_EXT_GC_MAX_B) + (i) * 4)
#define _PRE_CSC_GAMC_INDEX_A 0x4A484
#define _PRE_CSC_GAMC_INDEX_B 0x4AC84
#define _PRE_CSC_GAMC_INDEX_C 0x4B484
#define PRE_CSC_GAMC_AUTO_INCREMENT (1 << 10)
#define _PRE_CSC_GAMC_DATA_A 0x4A488
#define _PRE_CSC_GAMC_DATA_B 0x4AC88
#define _PRE_CSC_GAMC_DATA_C 0x4B488
#define PRE_CSC_GAMC_INDEX(pipe) _MMIO_PIPE(pipe, _PRE_CSC_GAMC_INDEX_A, _PRE_CSC_GAMC_INDEX_B)
#define PRE_CSC_GAMC_DATA(pipe) _MMIO_PIPE(pipe, _PRE_CSC_GAMC_DATA_A, _PRE_CSC_GAMC_DATA_B)
/* pipe CSC & degamma/gamma LUTs on CHV */
#define _CGM_PIPE_A_CSC_COEFF01 (VLV_DISPLAY_BASE + 0x67900)
#define _CGM_PIPE_A_CSC_COEFF23 (VLV_DISPLAY_BASE + 0x67904)

58
drivers/gpu/drm/i915/intel_color.c
View File

@ -380,7 +380,9 @@ static void bdw_load_gamma_lut(struct drm_crtc_state *state, u32 offset)
WARN_ON(offset & ~PAL_PREC_INDEX_VALUE_MASK);
I915_WRITE(PREC_PAL_INDEX(pipe),
PAL_PREC_SPLIT_MODE | PAL_PREC_AUTO_INCREMENT | offset);
(offset ? PAL_PREC_SPLIT_MODE : 0) |
PAL_PREC_AUTO_INCREMENT |
offset);
if (state->gamma_lut) {
struct drm_color_lut *lut =
@ -443,6 +445,57 @@ static void broadwell_load_luts(struct drm_crtc_state *state)
I915_WRITE(PREC_PAL_INDEX(pipe), 0);
}
static void glk_load_degamma_lut(struct drm_crtc_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->crtc->dev);
enum pipe pipe = to_intel_crtc(state->crtc)->pipe;
const uint32_t lut_size = 33;
uint32_t i;
/*
* When setting the auto-increment bit, the hardware seems to
* ignore the index bits, so we need to reset it to index 0
* separately.
*/
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++) {
uint32_t v = (i * ((1 << 16) - 1)) / (lut_size - 1);
I915_WRITE(PRE_CSC_GAMC_DATA(pipe), v);
}
/* Clamp values > 1.0. */
while (i++ < 35)
I915_WRITE(PRE_CSC_GAMC_DATA(pipe), (1 << 16) - 1);
}
static void glk_load_luts(struct drm_crtc_state *state)
{
struct drm_crtc *crtc = state->crtc;
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_crtc_state *intel_state = to_intel_crtc_state(state);
enum pipe pipe = to_intel_crtc(crtc)->pipe;
if (crtc_state_is_legacy(state)) {
haswell_load_luts(state);
return;
}
glk_load_degamma_lut(state);
bdw_load_gamma_lut(state, 0);
intel_state->gamma_mode = GAMMA_MODE_MODE_10BIT;
I915_WRITE(GAMMA_MODE(pipe), GAMMA_MODE_MODE_10BIT);
POSTING_READ(GAMMA_MODE(pipe));
}
/* Loads the palette/gamma unit for the CRTC on CherryView. */
static void cherryview_load_luts(struct drm_crtc_state *state)
{
@ -561,6 +614,9 @@ void intel_color_init(struct drm_crtc *crtc)
IS_BROXTON(dev_priv)) {
dev_priv->display.load_csc_matrix = i9xx_load_csc_matrix;
dev_priv->display.load_luts = broadwell_load_luts;
} else if (IS_GEMINILAKE(dev_priv)) {
dev_priv->display.load_csc_matrix = i9xx_load_csc_matrix;
dev_priv->display.load_luts = glk_load_luts;
} else {
dev_priv->display.load_luts = i9xx_load_luts;
}