On Mon, Jul 17, 2017 at 08:06:24PM +0530, Shashank Sharma wrote:
> To get HDMI YCBCR420 output, the PIPEMISC register should be
> programmed to:
> - Generate YCBCR output (bit 11)
> - In case of YCBCR420 outputs, it should be programmed in full
> blend mode to use the scaler in 5x3 ratio (bits 26 and 27)
>
> This patch:
> - Adds definition of these bits.
> - Programs PIPEMISC for YCBCR420 outputs.
> - Adds readouts to compare HW and SW states.
>
> V2: rebase
> V3: rebase
> V4: rebase
> V5: added r-b from Ander
> V6: Handle only YCBCR420 outputs (ville)
> V7: rebase
> V8: Addressed review comments from Ville
> - Add readouts for state->ycbcr420 and 420 pixel_clock.
> - Handle warning due to mismatch in clock for ycbcr420 clock.
> - Rename PIPEMISC macros to match the Bspec.
> - Add a debug print stating if YCBCR 4:2:0 output enabled.
> Added r-b from Ville
>
> Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
> Cc: Ander Conselvan de Oliveira <conselv...@gmail.com>
> Cc: Daniel Vetter <daniel.vet...@intel.com>
>
> Reviewed-by: Ander Conselvan de Oliveira <conselv...@gmail.com>
> Reviewed-by: Ville Syrjala <ville.syrj...@linux.intel.com>
> Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 3 ++
> drivers/gpu/drm/i915/intel_display.c | 55
> ++++++++++++++++++++++++++++++++++--
> 2 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index c712d01..6dfcdd3 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -5227,6 +5227,9 @@ enum {
>
> #define _PIPE_MISC_A 0x70030
> #define _PIPE_MISC_B 0x71030
> +#define PIPEMISC_YUV420_ENABLE (1<<27)
> +#define PIPEMISC_YUV420_MODE_BLEND (1<<26)
> +#define PIPEMISC_OUTPUT_YUV (1<<11)
> #define PIPEMISC_DITHER_BPC_MASK (7<<5)
> #define PIPEMISC_DITHER_8_BPC (0<<5)
> #define PIPEMISC_DITHER_10_BPC (1<<5)
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index d78f1c2..788502a 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6216,7 +6216,6 @@ static uint32_t ilk_pipe_pixel_rate(const struct
> intel_crtc_state *pipe_config)
> * We only use IF-ID interlacing. If we ever use
> * PF-ID we'll need to adjust the pixel_rate here.
> */
> -
> if (pipe_config->pch_pfit.enabled) {
> uint64_t pipe_w, pipe_h, pfit_w, pfit_h;
> uint32_t pfit_size = pipe_config->pch_pfit.size;
> @@ -8076,6 +8075,7 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
> {
> struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> + struct intel_crtc_state *config = intel_crtc->config;
>
> if (IS_BROADWELL(dev_priv) || INTEL_INFO(dev_priv)->gen >= 9) {
> u32 val = 0;
> @@ -8101,6 +8101,12 @@ static void haswell_set_pipemisc(struct drm_crtc *crtc)
> if (intel_crtc->config->dither)
> val |= PIPEMISC_DITHER_ENABLE | PIPEMISC_DITHER_TYPE_SP;
>
> + if (config->ycbcr420) {
> + val |= PIPEMISC_OUTPUT_YUV |
> + PIPEMISC_YUV420_ENABLE |
> + PIPEMISC_YUV420_MODE_BLEND;
> + }
> +
> I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
> }
> }
> @@ -9170,6 +9176,10 @@ static bool haswell_get_pipe_config(struct intel_crtc
> *crtc,
> pipe_config->scaler_state.scaler_users &= ~(1 <<
> SKL_CRTC_INDEX);
> }
>
> + if (IS_GEMINILAKE(dev_priv))
> + pipe_config->ycbcr420 = I915_READ(PIPEMISC(crtc->pipe)) &
> + PIPEMISC_YUV420_ENABLE;
> +
Besides my previous comments on this patch: I don't see any problem of
handling the other platforms too as Ville suggested, even if only YUV420
is supported atm and even if only on GLK. It gives fastboot a chance to
work on those platforms too and additional debug info if they happen to
boot with a YUV420 mode. Also would be good to print at least a note for
modes that we don't support or are invalid:
if (IS_BDW || GEN >= 9) {
tmp = READ(PIPEMISC);
if (IS_GLK || GEN >= 10) {
crtc_state->ycbcr420 = tmp & YUV420_ENABLE;
if (crtc_state->ycbcr420 != !!(tmp & OUTPUT_COLORSPACE_YUV) ||
crtc_state->ycbcr420 != !!(tmp & YUV420_MODE_FULL_BLEND))
DRM_DEBUG_KMS("Unsupported/invalid YCbCr 420 mode
(%08x)\n", tmp);
} else if (tmp & OUTPUT_COLORSPACE_YUV) {
DRM_DEBUG_KMS("Unsupported YCbCr mode\n");
}
}
> power_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
> if (intel_display_power_get_if_enabled(dev_priv, power_domain)) {
> power_domain_mask |= BIT_ULL(power_domain);
> @@ -11377,6 +11387,9 @@ static void intel_dump_pipe_config(struct intel_crtc
> *crtc,
> pipe_config->fdi_lanes,
> &pipe_config->fdi_m_n);
>
> + if (pipe_config->ycbcr420)
> + DRM_DEBUG_KMS("YCbCr 4:2:0 output enabled\n");
> +
> if (intel_crtc_has_dp_encoder(pipe_config)) {
> intel_dump_m_n_config(pipe_config, "dp m_n",
> pipe_config->lane_count, &pipe_config->dp_m_n);
> @@ -11704,6 +11717,22 @@ intel_modeset_update_crtc_state(struct
> drm_atomic_state *state)
> }
> }
>
> +static bool intel_420_clock_check(int clock1, int clock2)
> +{
> + int diff;
> +
> + if (clock1 == clock2 * 2)
> + return true;
> +
> + clock2 *= 2;
> + diff = abs(clock1 - clock2);
> +
> + if (((((diff + clock1 + clock2) * 100)) / (clock1 + clock2)) < 105)
> + return true;
> +
> + return false;
> +}
> +
> static bool intel_fuzzy_clock_check(int clock1, int clock2)
> {
> int diff;
> @@ -11832,6 +11861,18 @@ intel_pipe_config_compare(struct drm_i915_private
> *dev_priv,
> ret = false; \
> }
>
> +#define PIPE_CONF_CHECK_CLOCK_420(name) \
> + do { \
> + if (!intel_420_clock_check(current_config->name, \
> + pipe_config->name)) { \
> + pipe_config_err(adjust, __stringify(name), \
> + "(expected %i, found %i)\n", \
> + current_config->name, \
> + pipe_config->name); \
> + ret = false; \
> + } \
> + } while (0)
> +
> #define PIPE_CONF_CHECK_M_N(name) \
> if (!intel_compare_link_m_n(¤t_config->name, \
> &pipe_config->name,\
> @@ -11983,7 +12024,10 @@ intel_pipe_config_compare(struct drm_i915_private
> *dev_priv,
> }
>
> PIPE_CONF_CHECK_I(scaler_state.scaler_id);
> - PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);
> + if (current_config->ycbcr420)
> + PIPE_CONF_CHECK_CLOCK_420(pixel_rate);
> + else
> + PIPE_CONF_CHECK_CLOCK_FUZZY(pixel_rate);
> }
>
> /* BDW+ don't expose a synchronous way to read the state */
> @@ -12009,7 +12053,11 @@ intel_pipe_config_compare(struct drm_i915_private
> *dev_priv,
> if (IS_G4X(dev_priv) || INTEL_GEN(dev_priv) >= 5)
> PIPE_CONF_CHECK_I(pipe_bpp);
>
> - PIPE_CONF_CHECK_CLOCK_FUZZY(base.adjusted_mode.crtc_clock);
> + /* YCBCR 420 pixel clock is half of the actual mode */
> + if (current_config->ycbcr420)
> + PIPE_CONF_CHECK_CLOCK_420(base.adjusted_mode.crtc_clock);
> + else
> + PIPE_CONF_CHECK_CLOCK_FUZZY(base.adjusted_mode.crtc_clock);
> PIPE_CONF_CHECK_CLOCK_FUZZY(port_clock);
>
> #undef PIPE_CONF_CHECK_X
> @@ -12018,6 +12066,7 @@ intel_pipe_config_compare(struct drm_i915_private
> *dev_priv,
> #undef PIPE_CONF_CHECK_FLAGS
> #undef PIPE_CONF_CHECK_CLOCK_FUZZY
> #undef PIPE_CONF_QUIRK
> +#undef PIPE_CONF_CHECK_CLOCK_420
>
> return ret;
> }
> --
> 2.7.4
>
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