Re: [PATCH v3 1/7] drm/i915: Add CRTC output format YCBCR 4:2:0

Sharma, Shashank
2018-01-18T06:21:16Z

Regards

Shashank

On 1/17/2018 11:57 PM, Ville Syrjälä wrote:
> On Fri, Jan 05, 2018 at 03:15:29PM +0530, Shashank Sharma wrote:
>> Currently, we are using a bool in CRTC state (state->ycbcr420),
>> to indicate modeset, that the output format is YCBCR 4:2:0. Now in
>> order to support other YCBCR formats, we will need more such flags.
>>
>> The idea behind this patch is to replace this bool with an enum,
>> and plug this in in the existing YCBCR 4:2:0 framework in such a
>> way that this can be re-used for YCBCR 4:4:4 and other output formats too.
>>
>> This patch adds a new enum for CRTC output formats, and then plugs it
>> in the existing modeset framework.
>>
>> V3: Added this patch in the series, to address review comments from
>> second patchset.
>>
>> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
>> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
>> ---
>> drivers/gpu/drm/i915/intel_color.c | 2 +-
>> drivers/gpu/drm/i915/intel_ddi.c | 2 +-
>> drivers/gpu/drm/i915/intel_display.c | 66 ++++++++++++++++++++++++------------
>> drivers/gpu/drm/i915/intel_drv.h | 10 ++++--
>> drivers/gpu/drm/i915/intel_hdmi.c | 6 ++--
>> drivers/gpu/drm/i915/intel_panel.c | 2 +-
>> 6 files changed, 59 insertions(+), 29 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
>> index aa66e95..99e32cb 100644
>> --- a/drivers/gpu/drm/i915/intel_color.c
>> +++ b/drivers/gpu/drm/i915/intel_color.c
>> @@ -141,7 +141,7 @@ static void i9xx_load_csc_matrix(struct drm_crtc_state *crtc_state)
>> uint16_t coeffs[9] = { 0, };
>> struct intel_crtc_state *intel_crtc_state = to_intel_crtc_state(crtc_state);
>>
>> - if (intel_crtc_state->ycbcr420) {
>> + if (intel_crtc_state->output_format == CRTC_OUTPUT_YCBCR420) {
>> i9xx_load_ycbcr_conversion_matrix(intel_crtc);
>> return;
>> } else if (crtc_state->ctm) {
>> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
>> index f51645a..84327e7 100644
>> --- a/drivers/gpu/drm/i915/intel_ddi.c
>> +++ b/drivers/gpu/drm/i915/intel_ddi.c
>> @@ -1264,7 +1264,7 @@ static void ddi_dotclock_get(struct intel_crtc_state *pipe_config)
>> else
>> dotclock = pipe_config->port_clock;
>>
>> - if (pipe_config->ycbcr420)
>> + if (pipe_config->output_format == CRTC_OUTPUT_YCBCR420)
>> dotclock *= 2;
>>
>> if (pipe_config->pixel_multiplier)
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index 0cd3559..69b0aa3 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -4644,7 +4644,8 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach,
>> */
>> need_scaling = src_w != dst_w || src_h != dst_h;
>>
>> - if (crtc_state->ycbcr420 && scaler_user == SKL_CRTC_INDEX)
>> + if (crtc_state->output_format == CRTC_OUTPUT_YCBCR420 &&
>> + scaler_user == SKL_CRTC_INDEX)
>> need_scaling = true;
>>
>> /*
>> @@ -6356,7 +6357,8 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
>> return -EINVAL;
>> }
>>
>> - if (pipe_config->ycbcr420 && pipe_config->base.ctm) {
>> + if (pipe_config->output_format == CRTC_OUTPUT_YCBCR420 &&
>> + pipe_config->base.ctm) {
>> /*
>> * There is only one pipe CSC unit per pipe, and we need that
>> * for output conversion from RGB->YCBCR. So if CTM is already
>> @@ -8177,10 +8179,10 @@ 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_COLORSPACE_YUV |
>> - PIPEMISC_YUV420_ENABLE |
>> - PIPEMISC_YUV420_MODE_FULL_BLEND;
>> + if (config->output_format == CRTC_OUTPUT_YCBCR420) {
>> + val |= PIPEMISC_OUTPUT_COLORSPACE_YUV;
>> + val |= PIPEMISC_YUV420_ENABLE |
>> + PIPEMISC_YUV420_MODE_FULL_BLEND;
>> }
>>
>> I915_WRITE(PIPEMISC(intel_crtc->pipe), val);
>> @@ -9156,6 +9158,19 @@ static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
>> }
>> }
>>
>> +static const char * const output_format_str[] = {
>> + "Invalid",
>> + "RGB",
>> + "YCBCR4:2:0",
>> +};
>> +
>> +static const char *output_formats(enum crtc_output_format format)
>> +{
>> + if (format < CRTC_OUTPUT_INVALID || format > CRTC_OUTPUT_YCBCR420)
>> + format = CRTC_OUTPUT_INVALID;
>> + return output_format_str[format + 1];
>> +}
>> +
>> static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>> struct intel_crtc_state *pipe_config)
>> {
>> @@ -9196,19 +9211,28 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>>
>> if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9) {
>> u32 tmp = I915_READ(PIPEMISC(crtc->pipe));
>> - bool clrspace_yuv = tmp & PIPEMISC_OUTPUT_COLORSPACE_YUV;
>> -
>> - if (IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10) {
>> - bool blend_mode_420 = tmp &
>> - PIPEMISC_YUV420_MODE_FULL_BLEND;
>> + enum crtc_output_format output_format = CRTC_OUTPUT_RGB;
>> +
>> + if (tmp & PIPEMISC_OUTPUT_COLORSPACE_YUV) {
>> + bool ycbcr420_enabled = tmp & PIPEMISC_YUV420_ENABLE;
>> + bool blend = tmp & PIPEMISC_YUV420_MODE_FULL_BLEND;
>> +
>> + if (ycbcr420_enabled) {
>> + /* We support 4:2:0 in full blend mode only */
>> + if (!blend)
>> + output_format = CRTC_OUTPUT_INVALID;
> Not sure that INVALID thing really provides any real value.
> Just feels like it's making the code more convoluted for something that
> should never really happen.
The check is directly adapted from the previous version of the code,
where we were still checking if
the registers are programmed properly, CRTC_OUTPUT_INVALID helps to
print the error messages and
fits into the existing framework, so I thought there is no harm in
keeping it.
>> + else if (!(IS_GEMINILAKE(dev_priv) ||
>> + INTEL_GEN(dev_priv) >= 10))
>> + output_format = CRTC_OUTPUT_INVALID;
>> + else
>> + output_format = CRTC_OUTPUT_YCBCR420;
>> + }
>>
>> - pipe_config->ycbcr420 = tmp & PIPEMISC_YUV420_ENABLE;
>> - if (pipe_config->ycbcr420 != clrspace_yuv ||
>> - pipe_config->ycbcr420 != blend_mode_420)
>> - DRM_DEBUG_KMS("Bad 4:2:0 mode (%08x)\n", tmp);
>> - } else if (clrspace_yuv) {
>> - DRM_DEBUG_KMS("YCbCr 4:2:0 Unsupported\n");
>> }
>> +
>> + pipe_config->output_format = output_format;
>> + DRM_DEBUG_KMS("Output format %s\n",
>> + output_formats(output_format));
>> }
>>
>> power_domain = POWER_DOMAIN_PIPE_PANEL_FITTER(crtc->pipe);
>> @@ -10558,6 +10582,9 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
>> DRM_DEBUG_KMS("output_types: %s (0x%x)\n",
>> buf, pipe_config->output_types);
>>
>> + DRM_DEBUG_KMS("output format: %s\n",
>> + output_formats(pipe_config->output_format));
>> +
>> DRM_DEBUG_KMS("cpu_transcoder: %s, pipe bpp: %i, dithering: %i\n",
>> transcoder_name(pipe_config->cpu_transcoder),
>> pipe_config->pipe_bpp, pipe_config->dither);
>> @@ -10567,9 +10594,6 @@ 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);
>> @@ -11143,6 +11167,7 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
>> PIPE_CONF_CHECK_I(base.adjusted_mode.crtc_vsync_end);
>>
>> PIPE_CONF_CHECK_I(pixel_multiplier);
>> + PIPE_CONF_CHECK_I(output_format);
>> PIPE_CONF_CHECK_BOOL(has_hdmi_sink);
>> if ((INTEL_GEN(dev_priv) < 8 && !IS_HASWELL(dev_priv)) ||
>> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
>> @@ -11151,7 +11176,6 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
>> PIPE_CONF_CHECK_BOOL(hdmi_scrambling);
>> PIPE_CONF_CHECK_BOOL(hdmi_high_tmds_clock_ratio);
>> PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_infoframe);
>> - PIPE_CONF_CHECK_BOOL(ycbcr420);
>>
>> PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_audio);
>>
>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>> index 30f791f..79662650 100644
>> --- a/drivers/gpu/drm/i915/intel_drv.h
>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>> @@ -609,6 +609,12 @@ struct intel_crtc_wm_state {
>> bool need_postvbl_update;
>> };
>>
>> +enum crtc_output_format {
> intel_output_format or something would fit the normal namespacing
> better.
Agree, will change it accordingly.
>
>> + CRTC_OUTPUT_INVALID = -1,
> The -1 doesn't make much sense to me. If we want to keep this IMO
> just let the enum start from 0. That will at least make it clear
> if you entirely forgot to do readout.
The reason why I kept INVALID as -1, is to make sure RGB starts at 0. So
that we need not to
explicitly set the CRTC_OUTPUT_FORMAT = RGB (which is also one of your
comment in the
series). This will allow least modifications in the existing code.

May be I can keep it in the end of the enum, but that would be moving as
and when we add
new formats. What do you suggest ?

- Shashank
>> + CRTC_OUTPUT_RGB,
>> + CRTC_OUTPUT_YCBCR420,
>> +};
>> +
>> struct intel_crtc_state {
>> struct drm_crtc_state base;
>>
>> @@ -795,8 +801,8 @@ struct intel_crtc_state {
>> /* HDMI High TMDS char rate ratio */
>> bool hdmi_high_tmds_clock_ratio;
>>
>> - /* output format is YCBCR 4:2:0 */
>> - bool ycbcr420;
>> + /* Output format RGB/YCBCR etc */
>> + enum crtc_output_format output_format;
>> };
>>
>> struct intel_crtc {
>> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
>> index bced7b9..b266a7f 100644
>> --- a/drivers/gpu/drm/i915/intel_hdmi.c
>> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
>> @@ -478,7 +478,7 @@ static void intel_hdmi_set_avi_infoframe(struct drm_encoder *encoder,
>> return;
>> }
>>
>> - if (crtc_state->ycbcr420)
>> + if (crtc_state->output_format == CRTC_OUTPUT_YCBCR420)
>> frame.avi.colorspace = HDMI_COLORSPACE_YUV420;
>> else
>> frame.avi.colorspace = HDMI_COLORSPACE_RGB;
>> @@ -1372,7 +1372,7 @@ static bool hdmi_12bpc_possible(const struct intel_crtc_state *crtc_state)
>> if (connector_state->crtc != crtc_state->base.crtc)
>> continue;
>>
>> - if (crtc_state->ycbcr420) {
>> + if (crtc_state->output_format == CRTC_OUTPUT_YCBCR420) {
>> const struct drm_hdmi_info *hdmi = &info->hdmi;
>>
>> if (!(hdmi->y420_dc_modes & DRM_EDID_YCBCR420_DC_36))
>> @@ -1407,7 +1407,7 @@ intel_hdmi_ycbcr420_config(struct drm_connector *connector,
>> config->port_clock /= 2;
>> *clock_12bpc /= 2;
>> *clock_8bpc /= 2;
>> - config->ycbcr420 = true;
>> + config->output_format = CRTC_OUTPUT_YCBCR420;
>>
>> /* YCBCR 420 output conversion needs a scaler */
>> if (skl_update_scaler_crtc(config)) {
>> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
>> index fa6831f..c57819f 100644
>> --- a/drivers/gpu/drm/i915/intel_panel.c
>> +++ b/drivers/gpu/drm/i915/intel_panel.c
>> @@ -111,7 +111,7 @@ intel_pch_panel_fitting(struct intel_crtc *intel_crtc,
>> /* Native modes don't need fitting */
>> if (adjusted_mode->crtc_hdisplay == pipe_config->pipe_src_w &&
>> adjusted_mode->crtc_vdisplay == pipe_config->pipe_src_h &&
>> - !pipe_config->ycbcr420)
>> + pipe_config->output_format != CRTC_OUTPUT_YCBCR420)
>> goto done;
>>
>> switch (fitting_mode) {
>> --
>> 2.7.4