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Message-ID: <CA+M3ks4qsz1iTx1CuE66Gc5_+EMuVy+w1o-T0mEjh5vBcC3ATQ@mail.gmail.com>
Date: Tue, 4 Feb 2020 12:01:16 +0100
From: Benjamin Gaignard <benjamin.gaignard@...aro.org>
To: Philippe CORNU <philippe.cornu@...com>
Cc: Yannick FERTRE <yannick.fertre@...com>,
Benjamin GAIGNARD <benjamin.gaignard@...com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre TORGUE <alexandre.torgue@...com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"linux-stm32@...md-mailman.stormreply.com"
<linux-stm32@...md-mailman.stormreply.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/stm: ltdc: check number of endpoints
Le jeu. 23 janv. 2020 à 10:51, Philippe CORNU <philippe.cornu@...com> a écrit :
>
> Dear Yannick,
> Thank you for your patch,
>
> Acked-by: Philippe Cornu <philippe.cornu@...com>
>
> Philippe :-)
>
> On 1/21/20 11:14 AM, Yannick Fertre wrote:
> > Number of endpoints could exceed the fix value MAX_ENDPOINTS(2).
> > Instead of increase simply this value, the number of endpoint
> > could be read from device tree. Load sequence has been a little
> > rework to take care of several panel or bridge which can be
> > connected/disconnected or enable/disable.
This patch doesn't apply on drm-misc-next.
Yannick could you rebase is on top of drm-misc-next and resend it ?
Thanks,
Benjamin
> >
> > Signed-off-by: Yannick Fertré <yannick.fertre@...com>
> > ---
> > drivers/gpu/drm/stm/ltdc.c | 104 ++++++++++++++++++++++-----------------------
> > 1 file changed, 52 insertions(+), 52 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> > index c2815e8..dba8e7f 100644
> > --- a/drivers/gpu/drm/stm/ltdc.c
> > +++ b/drivers/gpu/drm/stm/ltdc.c
> > @@ -42,8 +42,6 @@
> >
> > #define MAX_IRQ 4
> >
> > -#define MAX_ENDPOINTS 2
> > -
> > #define HWVER_10200 0x010200
> > #define HWVER_10300 0x010300
> > #define HWVER_20101 0x020101
> > @@ -1190,36 +1188,20 @@ int ltdc_load(struct drm_device *ddev)
> > struct ltdc_device *ldev = ddev->dev_private;
> > struct device *dev = ddev->dev;
> > struct device_node *np = dev->of_node;
> > - struct drm_bridge *bridge[MAX_ENDPOINTS] = {NULL};
> > - struct drm_panel *panel[MAX_ENDPOINTS] = {NULL};
> > + struct drm_bridge *bridge;
> > + struct drm_panel *panel;
> > struct drm_crtc *crtc;
> > struct reset_control *rstc;
> > struct resource *res;
> > - int irq, ret, i, endpoint_not_ready = -ENODEV;
> > + int irq, i, nb_endpoints;
> > + int ret = -ENODEV;
> >
> > DRM_DEBUG_DRIVER("\n");
> >
> > - /* Get endpoints if any */
> > - for (i = 0; i < MAX_ENDPOINTS; i++) {
> > - ret = drm_of_find_panel_or_bridge(np, 0, i, &panel[i],
> > - &bridge[i]);
> > -
> > - /*
> > - * If at least one endpoint is -EPROBE_DEFER, defer probing,
> > - * else if at least one endpoint is ready, continue probing.
> > - */
> > - if (ret == -EPROBE_DEFER)
> > - return ret;
> > - else if (!ret)
> > - endpoint_not_ready = 0;
> > - }
> > -
> > - if (endpoint_not_ready)
> > - return endpoint_not_ready;
> > -
> > - rstc = devm_reset_control_get_exclusive(dev, NULL);
> > -
> > - mutex_init(&ldev->err_lock);
> > + /* Get number of endpoints */
> > + nb_endpoints = of_graph_get_endpoint_count(np);
> > + if (!nb_endpoints)
> > + return -ENODEV;
> >
> > ldev->pixel_clk = devm_clk_get(dev, "lcd");
> > if (IS_ERR(ldev->pixel_clk)) {
> > @@ -1233,6 +1215,43 @@ int ltdc_load(struct drm_device *ddev)
> > return -ENODEV;
> > }
> >
> > + /* Get endpoints if any */
> > + for (i = 0; i < nb_endpoints; i++) {
> > + ret = drm_of_find_panel_or_bridge(np, 0, i, &panel, &bridge);
> > +
> > + /*
> > + * If at least one endpoint is -ENODEV, continue probing,
> > + * else if at least one endpoint returned an error
> > + * (ie -EPROBE_DEFER) then stop probing.
> > + */
> > + if (ret == -ENODEV)
> > + continue;
> > + else if (ret)
> > + goto err;
> > +
> > + if (panel) {
> > + bridge = drm_panel_bridge_add_typed(panel,
> > + DRM_MODE_CONNECTOR_DPI);
> > + if (IS_ERR(bridge)) {
> > + DRM_ERROR("panel-bridge endpoint %d\n", i);
> > + ret = PTR_ERR(bridge);
> > + goto err;
> > + }
> > + }
> > +
> > + if (bridge) {
> > + ret = ltdc_encoder_init(ddev, bridge);
> > + if (ret) {
> > + DRM_ERROR("init encoder endpoint %d\n", i);
> > + goto err;
> > + }
> > + }
> > + }
> > +
> > + rstc = devm_reset_control_get_exclusive(dev, NULL);
> > +
> > + mutex_init(&ldev->err_lock);
> > +
> > if (!IS_ERR(rstc)) {
> > reset_control_assert(rstc);
> > usleep_range(10, 20);
> > @@ -1268,7 +1287,6 @@ int ltdc_load(struct drm_device *ddev)
> > }
> > }
> >
> > -
> > ret = ltdc_get_caps(ddev);
> > if (ret) {
> > DRM_ERROR("hardware identifier (0x%08x) not supported!\n",
> > @@ -1278,27 +1296,6 @@ int ltdc_load(struct drm_device *ddev)
> >
> > DRM_DEBUG_DRIVER("ltdc hw version 0x%08x\n", ldev->caps.hw_version);
> >
> > - /* Add endpoints panels or bridges if any */
> > - for (i = 0; i < MAX_ENDPOINTS; i++) {
> > - if (panel[i]) {
> > - bridge[i] = drm_panel_bridge_add_typed(panel[i],
> > - DRM_MODE_CONNECTOR_DPI);
> > - if (IS_ERR(bridge[i])) {
> > - DRM_ERROR("panel-bridge endpoint %d\n", i);
> > - ret = PTR_ERR(bridge[i]);
> > - goto err;
> > - }
> > - }
> > -
> > - if (bridge[i]) {
> > - ret = ltdc_encoder_init(ddev, bridge[i]);
> > - if (ret) {
> > - DRM_ERROR("init encoder endpoint %d\n", i);
> > - goto err;
> > - }
> > - }
> > - }
> > -
> > crtc = devm_kzalloc(dev, sizeof(*crtc), GFP_KERNEL);
> > if (!crtc) {
> > DRM_ERROR("Failed to allocate crtc\n");
> > @@ -1331,8 +1328,8 @@ int ltdc_load(struct drm_device *ddev)
> >
> > return 0;
> > err:
> > - for (i = 0; i < MAX_ENDPOINTS; i++)
> > - drm_panel_bridge_remove(bridge[i]);
> > + for (i = 0; i < nb_endpoints; i++)
> > + drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
> >
> > clk_disable_unprepare(ldev->pixel_clk);
> >
> > @@ -1341,11 +1338,14 @@ int ltdc_load(struct drm_device *ddev)
> >
> > void ltdc_unload(struct drm_device *ddev)
> > {
> > - int i;
> > + struct device *dev = ddev->dev;
> > + int nb_endpoints, i;
> >
> > DRM_DEBUG_DRIVER("\n");
> >
> > - for (i = 0; i < MAX_ENDPOINTS; i++)
> > + nb_endpoints = of_graph_get_endpoint_count(dev->of_node);
> > +
> > + for (i = 0; i < nb_endpoints; i++)
> > drm_of_panel_bridge_remove(ddev->dev->of_node, 0, i);
> >
> > pm_runtime_disable(ddev->dev);
> >
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