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authorAnatolij Gustschin <agust@denx.de>2013-01-19 13:59:10 +0400
committerAnatolij Gustschin <agust@denx.de>2013-01-29 12:29:57 +0400
commitb2639b5f1d01f218dc95537a1c352b3a551c4dd5 (patch)
tree220965a5adad447c7cce418035c12c4cfc97be7c /drivers/video/fsl-diu-fb.c
parent5d3cc311a76073f6e0a27c0752f7e41f69e95ea7 (diff)
downloadlinux-b2639b5f1d01f218dc95537a1c352b3a551c4dd5.tar.xz
drivers/video: fsl-diu-fb: fix bugs in interrupt handling
Since commit f74de500 "drivers/video: fsl-diu-fb: streamline enabling of interrupts" the interrupt handling in the driver is broken. Enabling diu interrupt causes an interrupt storm and results in system lockup. The cookie for the interrupt handler function passed to request_irq() is wrong (it must be a pointer to the diu struct, and not the address of the pointer to the diu struct). As a result the interrupt handler can not read diu registers and acknowledge the interrupt. Fix cookie arguments for request_irq() and free_irq(). Registering the diu interrupt handler in probe() must happen before install_fb() calls since this function registers framebuffer devices and if fbcon tries to take over framebuffer after registering a frame buffer device, it will call fb_open of the diu driver and enable the interrupts. At this time the diu interrupt handler must be registered already. Disabling the interrupts in fsl_diu_release() must happen only if all other AOIs are closed. Otherwise closing an overlay plane will disable the interrupts even if the primary frame buffer plane is opened. Add an appropriate check in the release function. Signed-off-by: Anatolij Gustschin <agust@denx.de> Cc: Timur Tabi <timur@tabi.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/video/fsl-diu-fb.c')
-rw-r--r--drivers/video/fsl-diu-fb.c58
1 files changed, 33 insertions, 25 deletions
diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index 1ca32c51d7cd..d33e8720cbb9 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -1232,6 +1232,16 @@ static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
return 0;
}
+static inline void fsl_diu_enable_interrupts(struct fsl_diu_data *data)
+{
+ u32 int_mask = INT_UNDRUN; /* enable underrun detection */
+
+ if (IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
+ int_mask |= INT_VSYNC; /* enable vertical sync */
+
+ clrbits32(&data->diu_reg->int_mask, int_mask);
+}
+
/* turn on fb if count == 1
*/
static int fsl_diu_open(struct fb_info *info, int user)
@@ -1251,19 +1261,7 @@ static int fsl_diu_open(struct fb_info *info, int user)
if (res < 0)
mfbi->count--;
else {
- struct fsl_diu_data *data = mfbi->parent;
-
-#ifdef CONFIG_NOT_COHERENT_CACHE
- /*
- * Enable underrun detection and vertical sync
- * interrupts.
- */
- clrbits32(&data->diu_reg->int_mask,
- INT_UNDRUN | INT_VSYNC);
-#else
- /* Enable underrun detection */
- clrbits32(&data->diu_reg->int_mask, INT_UNDRUN);
-#endif
+ fsl_diu_enable_interrupts(mfbi->parent);
fsl_diu_enable_panel(info);
}
}
@@ -1283,9 +1281,18 @@ static int fsl_diu_release(struct fb_info *info, int user)
mfbi->count--;
if (mfbi->count == 0) {
struct fsl_diu_data *data = mfbi->parent;
+ bool disable = true;
+ int i;
- /* Disable interrupts */
- out_be32(&data->diu_reg->int_mask, 0xffffffff);
+ /* Disable interrupts only if all AOIs are closed */
+ for (i = 0; i < NUM_AOIS; i++) {
+ struct mfb_info *mi = data->fsl_diu_info[i].par;
+
+ if (mi->count)
+ disable = false;
+ }
+ if (disable)
+ out_be32(&data->diu_reg->int_mask, 0xffffffff);
fsl_diu_disable_panel(info);
}
@@ -1614,14 +1621,6 @@ static int __devinit fsl_diu_probe(struct platform_device *pdev)
out_be32(&data->diu_reg->desc[1], data->dummy_ad.paddr);
out_be32(&data->diu_reg->desc[2], data->dummy_ad.paddr);
- for (i = 0; i < NUM_AOIS; i++) {
- ret = install_fb(&data->fsl_diu_info[i]);
- if (ret) {
- dev_err(&pdev->dev, "could not register fb %d\n", i);
- goto error;
- }
- }
-
/*
* Older versions of U-Boot leave interrupts enabled, so disable
* all of them and clear the status register.
@@ -1630,12 +1629,21 @@ static int __devinit fsl_diu_probe(struct platform_device *pdev)
in_be32(&data->diu_reg->int_status);
ret = request_irq(data->irq, fsl_diu_isr, 0, "fsl-diu-fb",
- &data->diu_reg);
+ data->diu_reg);
if (ret) {
dev_err(&pdev->dev, "could not claim irq\n");
goto error;
}
+ for (i = 0; i < NUM_AOIS; i++) {
+ ret = install_fb(&data->fsl_diu_info[i]);
+ if (ret) {
+ dev_err(&pdev->dev, "could not register fb %d\n", i);
+ free_irq(data->irq, data->diu_reg);
+ goto error;
+ }
+ }
+
sysfs_attr_init(&data->dev_attr.attr);
data->dev_attr.attr.name = "monitor";
data->dev_attr.attr.mode = S_IRUGO|S_IWUSR;
@@ -1667,7 +1675,7 @@ static int fsl_diu_remove(struct platform_device *pdev)
data = dev_get_drvdata(&pdev->dev);
disable_lcdc(&data->fsl_diu_info[0]);
- free_irq(data->irq, &data->diu_reg);
+ free_irq(data->irq, data->diu_reg);
for (i = 0; i < NUM_AOIS; i++)
uninstall_fb(&data->fsl_diu_info[i]);