On Fri, Jan 27, 2017 at 11:19:49AM +0200, Ander Conselvan de Oliveira wrote:
> The only difference between the code loading the pipe gamma and degamma
> tables in BDW is that the gamma code also writes the registers that hold
> the maximum values. So we can use the gamma code for the degamma table,
> at the expense of writing the maximum value register twice, with
> potenttially wrong values in the first time.
>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@xxxxxxxxx>
> ---
>
> Ville, does this help with the split gamma enable/disable confusion?
I might. Certainly it avoids a bunch of duplicated code. One comment
below...
>
> Note that I didn't test this.
>
> Ander
>
> ---
> drivers/gpu/drm/i915/intel_color.c | 57 ++++++++++----------------------------
> 1 file changed, 15 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
> index 08345e5..c686c37 100644
> --- a/drivers/gpu/drm/i915/intel_color.c
> +++ b/drivers/gpu/drm/i915/intel_color.c
> @@ -340,54 +340,22 @@ static void haswell_load_luts(struct drm_crtc_state *crtc_state)
> hsw_enable_ips(intel_crtc);
> }
>
> -static void bdw_load_degamma_lut(struct drm_crtc_state *state)
> +static void bdw_load_lut(struct drm_crtc_state *state, u32 offset,
> + struct drm_color_lut *lut, u32 lut_size,
> + bool split_mode)
Maybe pass PAL_PREC_SPLIT_MODE or 0 here directly? To make the callers
even more clear we could go as far as defining a symbolic name for the 0.
> {
> struct drm_i915_private *dev_priv = to_i915(state->crtc->dev);
> enum pipe pipe = to_intel_crtc(state->crtc)->pipe;
> - uint32_t i, lut_size = INTEL_INFO(dev_priv)->color.degamma_lut_size;
> -
> - I915_WRITE(PREC_PAL_INDEX(pipe),
> - PAL_PREC_SPLIT_MODE | PAL_PREC_AUTO_INCREMENT);
> -
> - if (state->degamma_lut) {
> - struct drm_color_lut *lut =
> - (struct drm_color_lut *) state->degamma_lut->data;
> -
> - for (i = 0; i < lut_size; i++) {
> - uint32_t word =
> - drm_color_lut_extract(lut[i].red, 10) << 20 |
> - drm_color_lut_extract(lut[i].green, 10) << 10 |
> - drm_color_lut_extract(lut[i].blue, 10);
> -
> - I915_WRITE(PREC_PAL_DATA(pipe), word);
> - }
> - } else {
> - for (i = 0; i < lut_size; i++) {
> - uint32_t v = (i * ((1 << 10) - 1)) / (lut_size - 1);
> -
> - I915_WRITE(PREC_PAL_DATA(pipe),
> - (v << 20) | (v << 10) | v);
> - }
> - }
> -}
> -
> -static void bdw_load_gamma_lut(struct drm_crtc_state *state, u32 offset)
> -{
> - struct drm_i915_private *dev_priv = to_i915(state->crtc->dev);
> - enum pipe pipe = to_intel_crtc(state->crtc)->pipe;
> - uint32_t i, lut_size = INTEL_INFO(dev_priv)->color.gamma_lut_size;
> + uint32_t i;
>
> WARN_ON(offset & ~PAL_PREC_INDEX_VALUE_MASK);
>
> I915_WRITE(PREC_PAL_INDEX(pipe),
> - (offset ? PAL_PREC_SPLIT_MODE : 0) |
> + (split_mode ? PAL_PREC_SPLIT_MODE : 0) |
> PAL_PREC_AUTO_INCREMENT |
> offset);
>
> - if (state->gamma_lut) {
> - struct drm_color_lut *lut =
> - (struct drm_color_lut *) state->gamma_lut->data;
> -
> + if (lut) {
> for (i = 0; i < lut_size; i++) {
> uint32_t word =
> (drm_color_lut_extract(lut[i].red, 10) << 20) |
> @@ -430,9 +398,12 @@ static void broadwell_load_luts(struct drm_crtc_state *state)
> return;
> }
>
> - bdw_load_degamma_lut(state);
> - bdw_load_gamma_lut(state,
> - INTEL_INFO(dev_priv)->color.degamma_lut_size);
> + bdw_load_lut(state, 0, (struct drm_color_lut *) state->degamma_lut,
> + INTEL_INFO(dev_priv)->color.degamma_lut_size, true);
> + bdw_load_lut(state, INTEL_INFO(dev_priv)->color.degamma_lut_size,
> + (struct drm_color_lut *) state->gamma_lut,
> + INTEL_INFO(dev_priv)->color.gamma_lut_size,
> + true);
>
> intel_state->gamma_mode = GAMMA_MODE_MODE_SPLIT;
> I915_WRITE(GAMMA_MODE(pipe), GAMMA_MODE_MODE_SPLIT);
> @@ -489,7 +460,9 @@ static void glk_load_luts(struct drm_crtc_state *state)
> }
>
> glk_load_degamma_lut(state);
> - bdw_load_gamma_lut(state, 0);
> + bdw_load_lut(state, 0, (struct drm_color_lut *) state->gamma_lut,
> + INTEL_INFO(dev_priv)->color.gamma_lut_size,
> + false);
>
> intel_state->gamma_mode = GAMMA_MODE_MODE_10BIT;
> I915_WRITE(GAMMA_MODE(pipe), GAMMA_MODE_MODE_10BIT);
> --
> 2.9.3
--
Ville Syrjälä
Intel OTC
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