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drm/tegra: dc: Remove redundant spinlock

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The spinlock is only used to serialize accesses to the DC_CMD_INT_MASK
register. However, this register is accesses either with interrupts
masked (in tegra_crtc_atomic_enable()) or protected by the vbl_lock and
vblank_time_lock spinlocks of the DRM device. Therefore, these accesses
don't need any extra serialization and the lock can be removed.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding
2017-12-14 13:50:19 +01:00
parent 1087fac18b
commit 363541e8ee
2 changed files with 2 additions and 12 deletions
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13
drivers/gpu/drm/tegra/dc.c
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@@ -1261,31 +1261,23 @@ static u32 tegra_dc_get_vblank_counter(struct drm_crtc *crtc)
static int tegra_dc_enable_vblank(struct drm_crtc *crtc)
{
struct tegra_dc *dc = to_tegra_dc(crtc);
unsigned long value, flags;
spin_lock_irqsave(&dc->lock, flags);
u32 value;
value = tegra_dc_readl(dc, DC_CMD_INT_MASK);
value |= VBLANK_INT;
tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
spin_unlock_irqrestore(&dc->lock, flags);
return 0;
}
static void tegra_dc_disable_vblank(struct drm_crtc *crtc)
{
struct tegra_dc *dc = to_tegra_dc(crtc);
unsigned long value, flags;
spin_lock_irqsave(&dc->lock, flags);
u32 value;
value = tegra_dc_readl(dc, DC_CMD_INT_MASK);
value &= ~VBLANK_INT;
tegra_dc_writel(dc, value, DC_CMD_INT_MASK);
spin_unlock_irqrestore(&dc->lock, flags);
}
static const struct drm_crtc_funcs tegra_crtc_funcs = {
@@ -2033,7 +2025,6 @@ static int tegra_dc_probe(struct platform_device *pdev)
dc->soc = of_device_get_match_data(&pdev->dev);
spin_lock_init(&dc->lock);
INIT_LIST_HEAD(&dc->list);
dc->dev = &pdev->dev;