On Fri, Dec 21, 2018 at 01:29:39AM +0530, Uma Shankar wrote:
> Add support for icl pipe degamma and gamma.
>
> v2: Removed a POSTING_READ and corrected the Bit
> Definition as per Maarten's comments.
>
> v3: Addressed Matt's review comments. Removed rmw patterns
> as suggested by Matt.
>
> v4: Fixed Matt's review comments.
>
> Signed-off-by: Uma Shankar <[email protected]>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 3 ++
> drivers/gpu/drm/i915/intel_color.c | 67
> ++++++++++++++++++++++++++++++++++++++
> 2 files changed, 70 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 02af9b5..1852c33 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -7092,6 +7092,9 @@ enum {
> #define GAMMA_MODE_MODE_12BIT (2 << 0)
> #define GAMMA_MODE_MODE_SPLIT (3 << 0)
>
> +#define PRE_CSC_GAMMA_ENABLE (1 << 31)
> +#define POST_CSC_GAMMA_ENABLE (1 << 30)
> +
> /* DMC/CSR */
> #define CSR_PROGRAM(i) _MMIO(0x80000 + (i) * 4)
> #define CSR_SSP_BASE_ADDR_GEN9 0x00002FC0
> diff --git a/drivers/gpu/drm/i915/intel_color.c
> b/drivers/gpu/drm/i915/intel_color.c
> index f32e4a7..e72d8d6 100644
> --- a/drivers/gpu/drm/i915/intel_color.c
> +++ b/drivers/gpu/drm/i915/intel_color.c
> @@ -534,6 +534,71 @@ static void glk_load_luts(struct intel_crtc_state
> *crtc_state)
> POSTING_READ(GAMMA_MODE(pipe));
> }
>
> +static void icl_load_degamma_lut(struct intel_crtc_state *crtc_state)
> +{
> + struct drm_device *dev = crtc_state->base.crtc->dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
> + const uint32_t lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size;
> + 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);
> +
> + 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.
> + * ToDo: Extend to max 7.0.
> + */
> + I915_WRITE(PRE_CSC_GAMC_DATA(pipe), lut[i].red);
Since 1.0 = 0x100, should we scale this by (0x100 / 0xFF) until we have
the newer segmented gamma ABI you're working on?
> + }
> + } else {
> + /* load a linear table. */
> + for (i = 0; i < lut_size; i++) {
> + uint32_t v = (i * (1 << 16)) / (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));
> +}
> +
> +static void icl_load_luts(struct intel_crtc_state *crtc_state)
> +{
> + struct drm_crtc *crtc = crtc_state->base.crtc;
> + struct drm_device *dev = crtc_state->base.crtc->dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
> + enum pipe pipe = to_intel_crtc(crtc)->pipe;
> + u32 gamma_mode = 0;
> +
> + if (crtc_state_is_legacy_gamma(crtc_state)) {
> + haswell_load_luts(crtc_state);
> + return;
> + }
> +
> + icl_load_degamma_lut(crtc_state);
> + bdw_load_gamma_lut(crtc_state, 0);
> +
> + gamma_mode = GAMMA_MODE_MODE_10BIT | PRE_CSC_GAMMA_ENABLE
> + | POST_CSC_GAMMA_ENABLE;
> + I915_WRITE(GAMMA_MODE(pipe), gamma_mode);
We might as well just stick these constants right in the I915_WRITE
call; no need to create a separate local variable to hold them.
Matt
> +}
> +
> /* Loads the palette/gamma unit for the CRTC on CherryView. */
> static void cherryview_load_luts(struct intel_crtc_state *crtc_state)
> {
> @@ -649,6 +714,8 @@ void intel_color_init(struct intel_crtc *crtc)
> } else if (IS_GEMINILAKE(dev_priv) || IS_CANNONLAKE(dev_priv)) {
> dev_priv->display.load_csc_matrix = ilk_load_csc_matrix;
> dev_priv->display.load_luts = glk_load_luts;
> + } else if (IS_ICELAKE(dev_priv)) {
> + dev_priv->display.load_luts = icl_load_luts;
> } else {
> dev_priv->display.load_luts = i9xx_load_luts;
> }
> --
> 1.9.1
>
--
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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