On Thu, 05 Dec 2019, "Kulkarni, Vandita" <vandita.kulkarni@xxxxxxxxx> wrote:
>> -----Original Message-----
>> From: Jani Nikula <jani.nikula@xxxxxxxxx>
>> Sent: Tuesday, November 26, 2019 7:13 PM
>> To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>> Cc: Nikula, Jani <jani.nikula@xxxxxxxxx>; Kulkarni, Vandita
>> <vandita.kulkarni@xxxxxxxxx>; Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>> Subject: [PATCH v3 13/13] drm/i915/dsi: add support for DSC
>>
>> Enable DSC for DSI, if specified in VBT.
>>
>> This still lacks DSC aware get config implementation, and therefore state
>> checker will fail. Also mode valid is not there yet.
>>
>> v4:
>> - convert_rgb = true (Vandita)
>> - ignore max cdclock check (Vandita)
>> - rename pipe_config to crtc_state
>>
>> v3:
>> - take compressed bpp into account
>>
>> v2:
>> - Nuke conn_state->max_requested_bpc, it's not used on DSI
>>
>> Bspec: 49263
>> Cc: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
>> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
>> ---
>> drivers/gpu/drm/i915/display/icl_dsi.c | 67 ++++++++++++++++++++++++--
>> 1 file changed, 64 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c
>> b/drivers/gpu/drm/i915/display/icl_dsi.c
>> index caa477c4b1af..e142ac64f680 100644
>> --- a/drivers/gpu/drm/i915/display/icl_dsi.c
>> +++ b/drivers/gpu/drm/i915/display/icl_dsi.c
>> @@ -34,6 +34,7 @@
>> #include "intel_ddi.h"
>> #include "intel_dsi.h"
>> #include "intel_panel.h"
>> +#include "intel_vdsc.h"
>>
>> static inline int header_credits_available(struct drm_i915_private *dev_priv,
>> enum transcoder dsi_trans)
>> @@ -1087,6 +1088,8 @@ static void gen11_dsi_pre_enable(struct
>> intel_encoder *encoder,
>> /* step5: program and powerup panel */
>> gen11_dsi_powerup_panel(encoder);
>>
>> + intel_dsc_enable(encoder, pipe_config);
>> +
>> /* step6c: configure transcoder timings */
>> gen11_dsi_set_transcoder_timings(encoder, pipe_config);
>>
>> @@ -1248,6 +1251,13 @@ static void gen11_dsi_disable(struct
>> intel_encoder *encoder,
>> gen11_dsi_disable_io_power(encoder);
>> }
>>
>> +static enum drm_mode_status gen11_dsi_mode_valid(struct
>> drm_connector *connector,
>> + struct drm_display_mode
>> *mode)
>> +{
>> + /* FIXME: DSC? */
>> + return intel_dsi_mode_valid(connector, mode); }
>> +
>> static void gen11_dsi_get_timings(struct intel_encoder *encoder,
>> struct intel_crtc_state *pipe_config) { @@ -
>> 1295,6 +1305,48 @@ static void gen11_dsi_get_config(struct intel_encoder
>> *encoder,
>> pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc); }
>>
>> +static int gen11_dsi_dsc_compute_config(struct intel_encoder *encoder,
>> + struct intel_crtc_state *crtc_state) {
>> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>> + struct drm_dsc_config *vdsc_cfg = &crtc_state->dsc.config;
>> + int dsc_max_bpc = INTEL_GEN(dev_priv) >= 12 ? 12 : 10;
>> + bool use_dsc;
>> + int ret;
>> +
>> + use_dsc = intel_bios_get_dsc_params(encoder, crtc_state,
>> dsc_max_bpc);
>> + if (!use_dsc)
>> + return 0;
>> +
>> + if (crtc_state->pipe_bpp < 8 * 3)
>> + return -EINVAL;
>> +
>> + /* FIXME: split only when necessary */
>> + if (crtc_state->dsc.slice_count > 1)
>> + crtc_state->dsc.dsc_split = true;
>> +
>> + vdsc_cfg->convert_rgb = true;
>> +
>
> Is there a chance this might fail and pipe_config->bpp might remain
> changed as per what happens in intel_bios_get_dsc_params?
In theory, yes, but I'm doubtful we'll be able to get anything on screen
if VBT says DSC is required and it fails somehow.
BR,
Jani.
>
>> + ret = intel_dsc_compute_params(encoder, crtc_state);
>> + if (ret)
>> + return ret;
>> +
>> + /* DSI specific sanity checks on the common code */
>> + WARN_ON(vdsc_cfg->vbr_enable);
>> + WARN_ON(vdsc_cfg->simple_422);
>> + WARN_ON(vdsc_cfg->pic_width % vdsc_cfg->slice_width);
>> + WARN_ON(vdsc_cfg->slice_height < 8);
>> + WARN_ON(vdsc_cfg->pic_height % vdsc_cfg->slice_height);
>> +
>> + ret = drm_dsc_compute_rc_parameters(vdsc_cfg);
>> + if (ret)
>> + return ret;
>> +
>> + crtc_state->dsc.compression_enable = true;
>> +
>> + return 0;
>> +}
>> +
>> static int gen11_dsi_compute_config(struct intel_encoder *encoder,
>> struct intel_crtc_state *pipe_config,
>> struct drm_connector_state *conn_state)
>> @@ -1326,6 +1378,10 @@ static int gen11_dsi_compute_config(struct
>> intel_encoder *encoder,
>> pipe_config->pipe_bpp = 18;
>>
>> pipe_config->clock_set = true;
>> +
>> + if (gen11_dsi_dsc_compute_config(encoder, pipe_config))
>> + DRM_DEBUG_KMS("Attempting to use DSC failed\n");
>> +
>> pipe_config->port_clock = afe_clk(encoder, pipe_config) / 5;
>>
>> return 0;
>> @@ -1334,8 +1390,13 @@ static int gen11_dsi_compute_config(struct
>> intel_encoder *encoder, static void gen11_dsi_get_power_domains(struct
>> intel_encoder *encoder,
>> struct intel_crtc_state *crtc_state) {
>> - get_dsi_io_power_domains(to_i915(encoder->base.dev),
>> - enc_to_intel_dsi(&encoder->base));
>> + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
>> +
>> + get_dsi_io_power_domains(i915, enc_to_intel_dsi(&encoder-
>> >base));
>> +
>> + if (crtc_state->dsc.compression_enable)
>> + intel_display_power_get(i915,
>> +
>> intel_dsc_power_domain(crtc_state));
>> }
>>
>> static bool gen11_dsi_get_hw_state(struct intel_encoder *encoder, @@ -
>> 1405,7 +1466,7 @@ static const struct drm_connector_funcs
>> gen11_dsi_connector_funcs = {
>>
>> static const struct drm_connector_helper_funcs
>> gen11_dsi_connector_helper_funcs = {
>> .get_modes = intel_dsi_get_modes,
>> - .mode_valid = intel_dsi_mode_valid,
>> + .mode_valid = gen11_dsi_mode_valid,
>> .atomic_check = intel_digital_connector_atomic_check,
>> };
>>
>> --
>> 2.20.1
>
--
Jani Nikula, Intel Open Source Graphics Center
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