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Message-ID: <CAE-0n50JXw6KL-u70csWS-9F6YhZy0pNah91h4e9a_9MnjJzmA@mail.gmail.com>
Date: Thu, 26 Aug 2021 07:13:53 +0000
From: Stephen Boyd <swboyd@...omium.org>
To: Abhinav Kumar <abhinavk@...eaurora.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...ux.ie>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Kalyan Thota <kalyan_t@...eaurora.org>,
Kuogee Hsieh <khsieh@...eaurora.org>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>
Cc: Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] drm/msm/dp: Support up to 3 DP controllers
Quoting Bjorn Andersson (2021-08-25 16:42:31)
> Based on the removal of the g_dp_display and the movement of the
> priv->dp lookup into the DP code it's now possible to have multiple
> DP instances.
>
> In line with the other controllers in the MSM driver, introduce a
> per-compatible list of base addresses which is used to resolve the
> "instance id" for the given DP controller. This instance id is used as
> index in the priv->dp[] array.
>
> Then extend the initialization code to initialize struct drm_encoder for
> each of the registered priv->dp[] and update the logic for associating
> each struct msm_dp with the struct dpu_encoder_virt.
>
> Lastly, bump the number of struct msm_dp instances carries by priv->dp
> to 3, the currently known maximum number of controllers found in a
> Qualcomm SoC.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>
> Changes since v1:
> - Update dpu_encoder_setup() to store the reference to the msm_dp in our dpu_enc
>
> drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 60 +++++++++++--------
> .../gpu/drm/msm/disp/msm_disp_snapshot_util.c | 8 ++-
> drivers/gpu/drm/msm/dp/dp_display.c | 51 ++++++++++++++--
> drivers/gpu/drm/msm/msm_drv.h | 2 +-
> 5 files changed, 90 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index b7f33da2799c..9cd9539a1504 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -2173,7 +2173,7 @@ int dpu_encoder_setup(struct drm_device *dev, struct drm_encoder *enc,
> dpu_encoder_vsync_event_handler,
> 0);
> else if (disp_info->intf_type == DRM_MODE_ENCODER_TMDS)
> - dpu_enc->dp = priv->dp;
> + dpu_enc->dp = priv->dp[disp_info->h_tile_instance[0]];
>
> INIT_DELAYED_WORK(&dpu_enc->delayed_off_work,
> dpu_encoder_off_work);
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> index f655adbc2421..a793cc8a007e 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
> @@ -188,6 +188,7 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor)
> struct dentry *entry;
> struct drm_device *dev;
> struct msm_drm_private *priv;
> + int i;
>
> if (!p)
> return -EINVAL;
> @@ -203,8 +204,8 @@ static int dpu_kms_debugfs_init(struct msm_kms *kms, struct drm_minor *minor)
> dpu_debugfs_vbif_init(dpu_kms, entry);
> dpu_debugfs_core_irq_init(dpu_kms, entry);
>
> - if (priv->dp)
> - msm_dp_debugfs_init(priv->dp, minor);
> + for (i = 0; i < ARRAY_SIZE(priv->dp); i++)
> + msm_dp_debugfs_init(priv->dp[i], minor);
Does this need the same if (!priv->dp) continue check like the other
loops over priv->dp?
>
> return dpu_core_perf_debugfs_init(dpu_kms, entry);
> }
> @@ -545,33 +546,40 @@ static int _dpu_kms_initialize_displayport(struct drm_device *dev,
> struct drm_encoder *encoder = NULL;
> struct msm_display_info info;
> int rc = 0;
> + int i;
>
> - if (!priv->dp)
> - return rc;
> + for (i = 0; i < ARRAY_SIZE(priv->dp); i++) {
> + if (!priv->dp[i])
> + continue;
Like this one.
>
> - encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_TMDS);
> - if (IS_ERR(encoder)) {
> - DPU_ERROR("encoder init failed for dsi display\n");
> - return PTR_ERR(encoder);
> - }
> + encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_TMDS);
> + if (IS_ERR(encoder)) {
> + DPU_ERROR("encoder init failed for dsi display\n");
> + return PTR_ERR(encoder);
> + }
>
> - memset(&info, 0, sizeof(info));
> - rc = msm_dp_modeset_init(priv->dp, dev, encoder);
> - if (rc) {
> - DPU_ERROR("modeset_init failed for DP, rc = %d\n", rc);
> - drm_encoder_cleanup(encoder);
> - return rc;
> - }
> + memset(&info, 0, sizeof(info));
> + rc = msm_dp_modeset_init(priv->dp[i], dev, encoder);
> + if (rc) {
> + DPU_ERROR("modeset_init failed for DP, rc = %d\n", rc);
> + drm_encoder_cleanup(encoder);
> + return rc;
> + }
>
> - priv->encoders[priv->num_encoders++] = encoder;
> + priv->encoders[priv->num_encoders++] = encoder;
> +
> + info.num_of_h_tiles = 1;
> + info.h_tile_instance[0] = i;
> + info.capabilities = MSM_DISPLAY_CAP_VID_MODE;
> + info.intf_type = encoder->encoder_type;
> + rc = dpu_encoder_setup(dev, encoder, &info);
> + if (rc) {
> + DPU_ERROR("failed to setup DPU encoder %d: rc:%d\n",
> + encoder->base.id, rc);
> + return rc;
> + }
> + }
>
> - info.num_of_h_tiles = 1;
> - info.capabilities = MSM_DISPLAY_CAP_VID_MODE;
> - info.intf_type = encoder->encoder_type;
> - rc = dpu_encoder_setup(dev, encoder, &info);
> - if (rc)
> - DPU_ERROR("failed to setup DPU encoder %d: rc:%d\n",
> - encoder->base.id, rc);
> return rc;
> }
>
> @@ -792,6 +800,7 @@ static int dpu_irq_postinstall(struct msm_kms *kms)
> {
> struct msm_drm_private *priv;
> struct dpu_kms *dpu_kms = to_dpu_kms(kms);
> + int i;
>
> if (!dpu_kms || !dpu_kms->dev)
> return -EINVAL;
> @@ -800,7 +809,8 @@ static int dpu_irq_postinstall(struct msm_kms *kms)
> if (!priv)
> return -EINVAL;
>
> - msm_dp_irq_postinstall(priv->dp);
> + for (i = 0; i < ARRAY_SIZE(priv->dp); i++)
> + msm_dp_irq_postinstall(priv->dp[i]);
This one too? Or maybe those gained NULL pointer checks.
>
> return 0;
> }
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 2c7de43f655a..4a6132c18e57 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -78,6 +78,8 @@ struct dp_display_private {
> char *name;
> int irq;
>
> + int id;
unsigned int?
> +
> /* state variables */
> bool core_initialized;
> bool hpd_irq_on;
> @@ -115,8 +117,19 @@ struct dp_display_private {
> struct dp_audio *audio;
> };
>
> +
> +struct msm_dp_config {
> + phys_addr_t io_start[3];
> + size_t num_dp;
> +};
> +
> +static const struct msm_dp_config sc7180_dp_cfg = {
> + .io_start = { 0x0ae90000 },
> + .num_dp = 1,
> +};
> +
> static const struct of_device_id dp_dt_match[] = {
> - {.compatible = "qcom,sc7180-dp"},
> + { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
> {}
> };
>
> @@ -211,7 +224,7 @@ static int dp_display_bind(struct device *dev, struct device *master,
>
> dp->dp_display.drm_dev = drm;
> priv = drm->dev_private;
> - priv->dp = &(dp->dp_display);
> + priv->dp[dp->id] = &(dp->dp_display);
>
> rc = dp->parser->parse(dp->parser);
> if (rc) {
> @@ -233,8 +246,11 @@ static int dp_display_bind(struct device *dev, struct device *master,
> }
>
> rc = dp_register_audio_driver(dev, dp->audio);
> - if (rc)
> + if (rc) {
> DRM_ERROR("Audio registration Dp failed\n");
> + goto end;
> + }
> +
>
> end:
> return rc;
> @@ -249,7 +265,7 @@ static void dp_display_unbind(struct device *dev, struct device *master,
>
> dp_power_client_deinit(dp->power);
> dp_aux_unregister(dp->aux);
> - priv->dp = NULL;
> + priv->dp[dp->id] = NULL;
> }
>
> static const struct component_ops dp_display_comp_ops = {
> @@ -1180,6 +1196,26 @@ int dp_display_request_irq(struct msm_dp *dp_display)
> return 0;
> }
>
> +static int dp_display_get_id(struct platform_device *pdev)
> +{
> + const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
> + struct resource *res;
> + int i;
> +
> +
Nitpick: Drop double newline.
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -EINVAL;
> +
> + for (i = 0; i < cfg->num_dp; i++) {
> + if (cfg->io_start[i] == res->start)
> + return i;
> + }
Nitpick: drop braces
> +
> + dev_err(&pdev->dev, "unknown displayport instance\n");
> + return -EINVAL;
> +}
> +
> static int dp_display_probe(struct platform_device *pdev)
> {
> int rc = 0;
> @@ -1194,6 +1230,10 @@ static int dp_display_probe(struct platform_device *pdev)
> if (!dp)
> return -ENOMEM;
>
> + dp->id = dp_display_get_id(pdev);
Ah ok, it's signed for this error check. Maybe assign dp->id in the
function and return 0 instead of assigning it here?
dp_display_assign_id()
> + if (dp->id < 0)
> + return -EINVAL;
> +
> dp->pdev = pdev;
> dp->name = "drm_dp";
>
> @@ -1388,6 +1428,9 @@ void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
> struct device *dev;
> int rc;
>
> + if (!dp_display)
> + return;
Alright that's one.
> +
> dp = container_of(dp_display, struct dp_display_private, dp_display);
> dev = &dp->pdev->dev;
>
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