diff options
| author | Rob Clark <robdclark@gmail.com> | 2017-07-03 20:13:57 +0300 |
|---|---|---|
| committer | Rob Clark <robdclark@gmail.com> | 2017-08-22 20:20:37 +0300 |
| commit | a7d3bb0045365ff84be35e3a4715af5d0216b7bd (patch) | |
| tree | 52b2833d7e9394c10eea12eeb78cea6a7fe85150 /drivers/gpu/drm/msm | |
| parent | a0ce4d23b13d2b028d20d34655a1a9afa300b625 (diff) | |
| download | linux-a7d3bb0045365ff84be35e3a4715af5d0216b7bd.tar.xz | |
drm/msm/mdp5: add tracking for clk enable-count
Accessing registers for an unclocked block is an insta-reboot on
snapdragon devices. So add a bit of logic to track the enable_count so
we can WARN_ON() unclocked register writes. This makes it much easier
to track down mistakes.
Signed-off-by: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/msm')
| -rw-r--r-- | drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h | 4 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c index b0800bad8ac8..9f9d95f7c80f 100644 --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c @@ -249,6 +249,9 @@ int mdp5_disable(struct mdp5_kms *mdp5_kms) { DBG(""); + mdp5_kms->enable_count--; + WARN_ON(mdp5_kms->enable_count < 0); + clk_disable_unprepare(mdp5_kms->ahb_clk); clk_disable_unprepare(mdp5_kms->axi_clk); clk_disable_unprepare(mdp5_kms->core_clk); @@ -262,6 +265,8 @@ int mdp5_enable(struct mdp5_kms *mdp5_kms) { DBG(""); + mdp5_kms->enable_count++; + clk_prepare_enable(mdp5_kms->ahb_clk); clk_prepare_enable(mdp5_kms->axi_clk); clk_prepare_enable(mdp5_kms->core_clk); diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h index b42461cda22d..9b3fe01089d1 100644 --- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h +++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h @@ -76,6 +76,8 @@ struct mdp5_kms { bool rpm_enabled; struct mdp_irq error_handler; + + int enable_count; }; #define to_mdp5_kms(x) container_of(x, struct mdp5_kms, base) @@ -167,11 +169,13 @@ struct mdp5_encoder { static inline void mdp5_write(struct mdp5_kms *mdp5_kms, u32 reg, u32 data) { + WARN_ON(mdp5_kms->enable_count <= 0); msm_writel(data, mdp5_kms->mmio + reg); } static inline u32 mdp5_read(struct mdp5_kms *mdp5_kms, u32 reg) { + WARN_ON(mdp5_kms->enable_count <= 0); return msm_readl(mdp5_kms->mmio + reg); } |