drm/vc4: dsi: Fix bridge chain handling

Commit 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked
list") patched the bridge chain logic to use a double-linked list instead
of a single-linked list. This change induced changes to the VC4 driver
which was manually resetting the encoder->bridge element to NULL to
control the enable/disable sequence of the bridge chain. During this
conversion, 2 bugs were introduced:

1/ list_splice() was used to move chain elements to our own internal
   chain, but list_splice() does not reset the source list to an empty
   state, leading to unexpected bridge hook calls when
   drm_bridge_chain_xxx() helpers were called by the core. Replacing
   those list_splice() calls by list_splice_init() ones fixes this
   problem.

2/ drm_bridge_chain_xxx() helpers operate on the
   bridge->encoder->bridge_chain list, which is now empty. When the
   helper uses list_for_each_entry_reverse() we end up with no operation
   done which is not what we want. But that's even worse when the helper
   uses list_for_each_entry_from(), because in that case we end up in
   an infinite loop searching for the list head element which is no
   longer encoder->bridge_chain but vc4_dsi->bridge_chain. To address
   that problem we stop using the bridge chain helpers and call the
   hooks directly.

Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Eric Anholt <eric@anholt.net>
Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20191227144124.210294-2-boris.brezillon@collabora.com

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 6c5b80a..fd8a2eb 100644 (file)
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -753,10 +753,19 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
        struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
        struct vc4_dsi *dsi = vc4_encoder->dsi;
        struct device *dev = &dsi->pdev->dev;
+       struct drm_bridge *iter;
+
+       list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
+               if (iter->funcs->disable)
+                       iter->funcs->disable(iter);
+       }
 
-       drm_bridge_chain_disable(dsi->bridge);
        vc4_dsi_ulps(dsi, true);
-       drm_bridge_chain_post_disable(dsi->bridge);
+
+       list_for_each_entry_from(iter, &dsi->bridge_chain, chain_node) {
+               if (iter->funcs->post_disable)
+                       iter->funcs->post_disable(iter);
+       }
 
        clk_disable_unprepare(dsi->pll_phy_clock);
        clk_disable_unprepare(dsi->escape_clock);
@@ -824,6 +833,7 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
        struct vc4_dsi *dsi = vc4_encoder->dsi;
        struct device *dev = &dsi->pdev->dev;
        bool debug_dump_regs = false;
+       struct drm_bridge *iter;
        unsigned long hs_clock;
        u32 ui_ns;
        /* Minimum LP state duration in escape clock cycles. */
@@ -1056,7 +1066,10 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
 
        vc4_dsi_ulps(dsi, false);
 
-       drm_bridge_chain_pre_enable(dsi->bridge);
+       list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
+               if (iter->funcs->pre_enable)
+                       iter->funcs->pre_enable(iter);
+       }
 
        if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
                DSI_PORT_WRITE(DISP0_CTRL,
@@ -1073,7 +1086,10 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
                               DSI_DISP0_ENABLE);
        }
 
-       drm_bridge_chain_enable(dsi->bridge);
+       list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
+               if (iter->funcs->enable)
+                       iter->funcs->enable(iter);
+       }
 
        if (debug_dump_regs) {
                struct drm_printer p = drm_info_printer(&dsi->pdev->dev);
@@ -1613,7 +1629,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
         * from our driver, since we need to sequence them within the
         * encoder's enable/disable paths.
         */
-       list_splice(&dsi->encoder->bridge_chain, &dsi->bridge_chain);
+       list_splice_init(&dsi->encoder->bridge_chain, &dsi->bridge_chain);
 
        if (dsi->port == 0)
                vc4_debugfs_add_regset32(drm, "dsi0_regs", &dsi->regset);
@@ -1639,7 +1655,7 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master,
         * Restore the bridge_chain so the bridge detach procedure can happen
         * normally.
         */
-       list_splice(&dsi->bridge_chain, &dsi->encoder->bridge_chain);
+       list_splice_init(&dsi->bridge_chain, &dsi->encoder->bridge_chain);
        vc4_dsi_encoder_destroy(dsi->encoder);
 
        if (dsi->port == 1)