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Message-ID: <02b7b643-f6d4-aa5f-6e05-46aa7c3a81cb@linaro.org>
Date: Wed, 24 Nov 2021 22:45:28 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Kuogee Hsieh <quic_khsieh@...cinc.com>, robdclark@...il.com,
sean@...rly.run, swboyd@...omium.org, vkoul@...nel.org,
daniel@...ll.ch, airlied@...ux.ie, agross@...nel.org,
bjorn.andersson@...aro.org
Cc: quic_abhinavk@...cinc.com, aravindh@...eaurora.org,
freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] drm/msm/dp: employ bridge mechanism for display enable
and disable
On 15/11/2021 21:48, Kuogee Hsieh wrote:
> Currently the msm_dp_*** functions implement the same sequence which would
> happen when drm_bridge is used. hence get rid of this intermediate layer
> and align with the drm_bridge usage to avoid customized implementation.
>
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>
> Changes in v2:
> -- revise commit text
> -- rename dp_bridge to msm_dp_bridge
> -- delete empty functions
>
> Changes in 3:
> -- replace kzalloc() with devm_kzalloc()
> -- replace __dp_display_enable() with dp_display_enable()
> -- replace __dp_display_disable() with dp_display_disable()
> ---
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 21 -------
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 7 +++
> drivers/gpu/drm/msm/dp/dp_display.c | 4 +-
> drivers/gpu/drm/msm/dp/dp_display.h | 1 +
> drivers/gpu/drm/msm/dp/dp_drm.c | 91 +++++++++++++++++++++++++++++
> drivers/gpu/drm/msm/msm_drv.h | 16 +++--
> 6 files changed, 113 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 31050aa..c4e08c4 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -1003,9 +1003,6 @@ 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)
> - msm_dp_display_mode_set(dpu_enc->dp, drm_enc, mode, adj_mode);
> -
> list_for_each_entry(conn_iter, connector_list, head)
> if (conn_iter->encoder == drm_enc)
> conn = conn_iter;
> @@ -1181,14 +1178,6 @@ 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) {
> - ret = msm_dp_display_enable(dpu_enc->dp, drm_enc);
> - if (ret) {
> - DPU_ERROR_ENC(dpu_enc, "dp display enable failed: %d\n",
> - ret);
> - goto out;
> - }
> - }
> dpu_enc->enabled = true;
>
> out:
> @@ -1214,11 +1203,6 @@ 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) {
> - if (msm_dp_display_pre_disable(dpu_enc->dp, drm_enc))
> - DPU_ERROR_ENC(dpu_enc, "dp display push idle failed\n");
> - }
> -
> dpu_encoder_resource_control(drm_enc, DPU_ENC_RC_EVENT_PRE_STOP);
>
> for (i = 0; i < dpu_enc->num_phys_encs; i++) {
> @@ -1243,11 +1227,6 @@ 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) {
> - if (msm_dp_display_disable(dpu_enc->dp, drm_enc))
> - DPU_ERROR_ENC(dpu_enc, "dp display disable failed\n");
> - }
> -
> mutex_unlock(&dpu_enc->enc_lock);
> }
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index 27d98b5..d16337f 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -557,6 +557,13 @@ static int _dpu_kms_initialize_displayport(struct drm_device *dev,
> encoder->base.id, rc);
> return rc;
> }
> +
> + rc = msm_dp_bridge_init(priv->dp[i], dev, encoder);
> + if (rc) {
> + DPU_ERROR("failed to setup DPU bridge %d: rc:%d\n",
> + encoder->base.id, rc);
> + return rc;
> + }
There is no need to teach DPU driver about all the gory details of DP
internals. Move this call to the msm_dp_modeset_init().
> }
>
> return rc;
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 2f113ff..51770a4 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1674,8 +1674,8 @@ int msm_dp_display_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)
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> {
> struct dp_display_private *dp_display;
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> index 76f45f9..2237e80 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> @@ -13,6 +13,7 @@
> struct msm_dp {
> struct drm_device *drm_dev;
> struct device *codec_dev;
> + struct drm_bridge *bridge;
> struct drm_connector *connector;
> struct drm_encoder *encoder;
> struct drm_panel *drm_panel;
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index f33e315..b341f1f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -5,12 +5,21 @@
>
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_atomic.h>
> +#include <drm/drm_bridge.h>
> #include <drm/drm_crtc.h>
>
> #include "msm_drv.h"
> #include "msm_kms.h"
> #include "dp_drm.h"
>
> +
> +struct msm_dp_bridge {
> + struct drm_bridge bridge;
> + struct msm_dp *dp_display;
> +};
> +
> +#define to_dp_display(x) container_of((x), struct msm_dp_bridge, bridge)
> +
> struct dp_connector {
> struct drm_connector base;
> struct msm_dp *dp_display;
> @@ -162,3 +171,85 @@ struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display)
>
> return connector;
> }
> +
> +static int dp_bridge_attach(struct drm_bridge *drm_bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + return 0;
> +}
As far as I see from drm_bridge_attach() there is no need to provide
stubs for attach callback. Please drop it.
> +
> +static void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + msm_dp_display_mode_set(dp_display, drm_bridge->encoder, mode, adjusted_mode);
> +}
> +
> +static void dp_bridge_enable(struct drm_bridge *drm_bridge)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + msm_dp_display_enable(dp_display, drm_bridge->encoder);
> +}
> +
> +static void dp_bridge_disable(struct drm_bridge *drm_bridge)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + msm_dp_display_pre_disable(dp_display, drm_bridge->encoder);
> +}
> +
> +static void dp_bridge_post_disable(struct drm_bridge *drm_bridge)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_display(drm_bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + msm_dp_display_disable(dp_display, drm_bridge->encoder);
> +}
> +
> +static const struct drm_bridge_funcs dp_bridge_ops = {
> + .attach = dp_bridge_attach,
> + .mode_fixup = NULL,
> + .pre_enable = NULL,
No need to initialize fields to default values (NULL). Drop these two
please.
> + .enable = dp_bridge_enable,
> + .disable = dp_bridge_disable,
> + .post_disable = dp_bridge_post_disable,
> + .mode_set = dp_bridge_mode_set,
> +};
> +
> +int msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> + struct drm_encoder *encoder)
> +{
> + int rc;
> + struct msm_drm_private *priv;
> + struct msm_dp_bridge *dp_bridge;
> + struct drm_bridge *bridge;
> +
> + dp_bridge = devm_kzalloc(dev->dev, sizeof(*dp_bridge), GFP_KERNEL);
> + if (!dp_bridge)
> + return -ENOMEM;
> +
> + dp_bridge->dp_display = dp_display;
> +
> + bridge = &dp_bridge->bridge;
> + bridge->funcs = &dp_bridge_ops;
> + bridge->encoder = encoder;
> +
> + rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> + if (rc) {
> + DRM_ERROR("failed to attach bridge, rc=%d\n", rc);
> + kfree(dp_bridge);
> + return rc;
> + }
> +
> + priv = dev->dev_private;
> + priv->bridges[priv->num_bridges++] = bridge;
> + dp_display->bridge = bridge;
> +
> + return 0;
> +} > diff --git a/drivers/gpu/drm/msm/msm_drv.h
b/drivers/gpu/drm/msm/msm_drv.h
> index 4bb797e..9a2092f 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -388,8 +388,10 @@ 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);
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode);
> +int msm_dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> + struct drm_encoder *encoder);
> 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);
>
> @@ -426,10 +428,16 @@ static inline int msm_dp_display_pre_disable(struct msm_dp *dp,
> }
> 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)
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> {
> }
> +static inline int msm_dp_bridge_init(struct msm_dp *dp_display,
> + struct drm_device *dev,
> + struct drm_encoder *encoder)
> +{
> + return -EINVAL;
> +}
If msm_dp_bridge_init() becomes DP-internal function, this is unnecessary.
>
> static inline void msm_dp_irq_postinstall(struct msm_dp *dp_display)
> {
>
--
With best wishes
Dmitry
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