On Mon, 23 Dec 2013, Vandana Kannan <vandana.kannan@xxxxxxxxx> wrote:
> For Broadwell, there is one instance of Transcoder MN values per transcoder.
> For dynamic switching between multiple refreshr rates, M/N values may be
> reprogrammed on the fly. Link N programming triggers update of all data and
> link M & N registers and the new M/N values will be used in the next frame
> that is output.
>
> v2: Incorporated Chris's review comments
> Changed to check for gen >=8 or gen > 5 before setting M/N registers
>
> Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx>
> Signed-off-by: Pradeep Bhat <pradeep.bhat@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 32 +++++++++++++++++++++++++-------
> 1 file changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 7778808..f18a585 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -798,11 +798,20 @@ intel_dp_set_m2_n2(struct intel_crtc *crtc, struct intel_link_m_n *m_n)
> struct drm_i915_private *dev_priv = dev->dev_private;
> enum transcoder transcoder = crtc->config.cpu_transcoder;
>
> - I915_WRITE(PIPE_DATA_M2(transcoder),
> - TU_SIZE(m_n->tu) | m_n->gmch_m);
> - I915_WRITE(PIPE_DATA_N2(transcoder), m_n->gmch_n);
> - I915_WRITE(PIPE_LINK_M2(transcoder), m_n->link_m);
> - I915_WRITE(PIPE_LINK_N2(transcoder), m_n->link_n);
> + if (INTEL_INFO(dev)->gen >= 8) {
> + I915_WRITE(PIPE_DATA_M1(transcoder),
> + TU_SIZE(m_n->tu) | m_n->gmch_m);
> + I915_WRITE(PIPE_DATA_N1(transcoder), m_n->gmch_n);
> + I915_WRITE(PIPE_LINK_M1(transcoder), m_n->link_m);
> + I915_WRITE(PIPE_LINK_N1(transcoder), m_n->link_n);
There's already a function for this part, called
intel_cpu_transcoder_set_m_n. Reuse it.
> + } else if (INTEL_INFO(dev)->gen >= 5) {
> + I915_WRITE(PIPE_DATA_M2(transcoder),
> + TU_SIZE(m_n->tu) | m_n->gmch_m);
> + I915_WRITE(PIPE_DATA_N2(transcoder), m_n->gmch_n);
> + I915_WRITE(PIPE_LINK_M2(transcoder), m_n->link_m);
> + I915_WRITE(PIPE_LINK_N2(transcoder), m_n->link_n);
> + }
> +
> return;
> }
>
> @@ -3612,8 +3621,17 @@ intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate) {
>
> mutex_lock(&intel_dp->drrs_state.mutex);
>
> - /* Haswell and below */
Forgot to mention in the earlier patch that comments like this are
redundant with the code. And in this case, it already *contradicts* the
code.
> - if (INTEL_INFO(dev)->gen >= 5 && INTEL_INFO(dev)->gen < 8) {
> + if (INTEL_INFO(dev)->gen >= 8) {
> + switch (index) {
> + case DRRS_HIGH_RR:
> + intel_dp_set_m2_n2(intel_crtc, &config->dp_m_n);
> + break;
> + case DRRS_LOW_RR:
> + intel_dp_set_m2_n2(intel_crtc, &config->dp_m2_n2);
> + break;
> + };
> + } else if (INTEL_INFO(dev)->gen >= 5) {
> + /* Haswell and below */
> reg = PIPECONF(intel_crtc->config.cpu_transcoder);
> val = I915_READ(reg);
> if (index > DRRS_HIGH_RR) {
> --
> 1.7.9.5
>
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--
Jani Nikula, Intel Open Source Technology Center
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