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Message-ID: <97ac00f8-eb25-9142-3bdc-904aad269b6e@linaro.org>
Date: Tue, 27 Jul 2021 21:42:34 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <bjorn.andersson@...aro.org>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Abhinav Kumar <abhinavk@...eaurora.org>,
Kalyan Thota <kalyan_t@...eaurora.org>,
Kuogee Hsieh <khsieh@...eaurora.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Stephen Boyd <swboyd@...omium.org>,
linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] drm/msm/dp: Modify prototype of encoder based API
On 25/07/2021 07:24, Bjorn Andersson wrote:
> Functions in the DisplayPort code that relates to individual instances
> (encoders) are passed both the struct msm_dp and the struct drm_encoder. But
> in a situation where multiple DP instances would exist this means that
> the caller need to resolve which struct msm_dp relates to the struct
> drm_encoder at hand.
>
> The information for doing this lookup is available inside the DP driver,
> so update the API to take the struct msm_drm_private and the struct
> drm_encoder and have the DP code figure out which struct msm_dp the
> operation relates to.
Initially I thought to propose moving encoder->dp lookup into dpu code
by adding msm_dp_display_get_encoder() function. However as I was
writing that, I remembered that at some point I had to refactor my own
patchset in the way to get rid of calling msm_FOO_get_encoder().
I'd propose simpler solution. In dpu_encoder_setup() you have the DP
index and the encoder. So you can store valid msm_dp pointer in the
dpu_encoder_virt and remove all the lookups. Then you can replace all
priv->dp with bare dpu_enc->dp accesses. Will this work for you?
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 17 +++++----
> drivers/gpu/drm/msm/dp/dp_display.c | 38 +++++++++++++++++----
> drivers/gpu/drm/msm/msm_drv.h | 31 +++++++++--------
> 3 files changed, 56 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 1c04b7cce43e..0d64ef0819af 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1002,8 +1002,8 @@ static void dpu_encoder_virt_mode_set(struct drm_encoder *drm_enc,
>
> trace_dpu_enc_mode_set(DRMID(drm_enc));
>
> - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp)
> - msm_dp_display_mode_set(priv->dp, drm_enc, mode, adj_mode);
> + if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS)
> + msm_dp_display_mode_set(priv, drm_enc, mode, adj_mode);
>
> list_for_each_entry(conn_iter, connector_list, head)
> if (conn_iter->encoder == drm_enc)
> @@ -1184,9 +1184,8 @@ static void dpu_encoder_virt_enable(struct drm_encoder *drm_enc)
>
> _dpu_encoder_virt_enable_helper(drm_enc);
>
> - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) {
> - ret = msm_dp_display_enable(priv->dp,
> - drm_enc);
> + if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
> + ret = msm_dp_display_enable(priv, drm_enc);
> if (ret) {
> DPU_ERROR_ENC(dpu_enc, "dp display enable failed: %d\n",
> ret);
> @@ -1226,8 +1225,8 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
> /* wait for idle */
> dpu_encoder_wait_for_event(drm_enc, MSM_ENC_TX_COMPLETE);
>
> - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) {
> - if (msm_dp_display_pre_disable(priv->dp, drm_enc))
> + if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
> + if (msm_dp_display_pre_disable(priv, drm_enc))
> DPU_ERROR_ENC(dpu_enc, "dp display push idle failed\n");
> }
>
> @@ -1255,8 +1254,8 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
>
> DPU_DEBUG_ENC(dpu_enc, "encoder disabled\n");
>
> - if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS && priv->dp) {
> - if (msm_dp_display_disable(priv->dp, drm_enc))
> + if (drm_enc->encoder_type == DRM_MODE_ENCODER_TMDS) {
> + if (msm_dp_display_disable(priv, drm_enc))
> DPU_ERROR_ENC(dpu_enc, "dp display disable failed\n");
> }
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 8696b36d30e4..59ffd6c8f41f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1432,12 +1432,25 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
> return 0;
> }
>
> -int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
> +static struct msm_dp *msm_dp_from_drm_encoder(struct msm_drm_private *priv,
> + struct drm_encoder *encoder)
> +{
> + if (priv->dp && priv->dp->encoder == encoder)
> + return priv->dp;
> +
> + return NULL;
> +}
> +
> +int msm_dp_display_enable(struct msm_drm_private *priv, struct drm_encoder *encoder)
> {
> int rc = 0;
> struct dp_display_private *dp_display;
> + struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
> u32 state;
>
> + if (!dp)
> + return -EINVAL;
> +
> dp_display = container_of(dp, struct dp_display_private, dp_display);
> if (!dp_display->dp_mode.drm_mode.clock) {
> DRM_ERROR("invalid params\n");
> @@ -1489,9 +1502,13 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
> return rc;
> }
>
> -int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder)
> +int msm_dp_display_pre_disable(struct msm_drm_private *priv, struct drm_encoder *encoder)
> {
> struct dp_display_private *dp_display;
> + struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
> +
> + if (!dp)
> + return 0;
>
> dp_display = container_of(dp, struct dp_display_private, dp_display);
>
> @@ -1500,11 +1517,15 @@ int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder)
> return 0;
> }
>
> -int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
> +int msm_dp_display_disable(struct msm_drm_private *priv, struct drm_encoder *encoder)
> {
> int rc = 0;
> u32 state;
> struct dp_display_private *dp_display;
> + struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
> +
> + if (!dp)
> + return 0;
>
> dp_display = container_of(dp, struct dp_display_private, dp_display);
>
> @@ -1531,11 +1552,16 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
> return rc;
> }
>
> -void msm_dp_display_mode_set(struct msm_dp *dp, struct drm_encoder *encoder,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> +void msm_dp_display_mode_set(struct msm_drm_private *priv,
> + struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted_mode)
> {
> struct dp_display_private *dp_display;
> + struct msm_dp *dp = msm_dp_from_drm_encoder(priv, encoder);
> +
> + if (!dp)
> + return;
>
> dp_display = container_of(dp, struct dp_display_private, dp_display);
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 9bfd37855969..e9232032b266 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -388,12 +388,13 @@ int __init msm_dp_register(void);
> void __exit msm_dp_unregister(void);
> int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
> struct drm_encoder *encoder);
> -int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder);
> -int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder);
> -int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder);
> -void msm_dp_display_mode_set(struct msm_dp *dp, struct drm_encoder *encoder,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode);
> +int msm_dp_display_enable(struct msm_drm_private *priv, struct drm_encoder *encoder);
> +int msm_dp_display_disable(struct msm_drm_private *priv, struct drm_encoder *encoder);
> +int msm_dp_display_pre_disable(struct msm_drm_private *priv, struct drm_encoder *encoder);
> +void msm_dp_display_mode_set(struct msm_drm_private *priv,
> + struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted_mode);
> void msm_dp_irq_postinstall(struct msm_dp *dp_display);
> void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display);
>
> @@ -413,25 +414,25 @@ static inline int msm_dp_modeset_init(struct msm_dp *dp_display,
> {
> return -EINVAL;
> }
> -static inline int msm_dp_display_enable(struct msm_dp *dp,
> +static inline int msm_dp_display_enable(struct msm_drm_private *priv,
> struct drm_encoder *encoder)
> {
> return -EINVAL;
> }
> -static inline int msm_dp_display_disable(struct msm_dp *dp,
> - struct drm_encoder *encoder)
> +static inline int msm_dp_display_disable(struct msm_drm_private *priv,
> + struct drm_encoder *encoder)
> {
> return -EINVAL;
> }
> -static inline int msm_dp_display_pre_disable(struct msm_dp *dp,
> - struct drm_encoder *encoder)
> +static inline int msm_dp_display_pre_disable(struct msm_drm_private *priv,
> + struct drm_encoder *encoder)
> {
> return -EINVAL;
> }
> -static inline void msm_dp_display_mode_set(struct msm_dp *dp,
> - struct drm_encoder *encoder,
> - struct drm_display_mode *mode,
> - struct drm_display_mode *adjusted_mode)
> +static inline void msm_dp_display_mode_set(struct msm_drm_private *priv,
> + struct drm_encoder *encoder,
> + struct drm_display_mode *mode,
> + struct drm_display_mode *adjusted_mode)
> {
> }
>
>
--
With best wishes
Dmitry
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