[PATCH] drm/tilcdc: Allocate register storage based on the actual number registers

[Jyri Sarha]

Allocate suspend/resume register storage based on the actual number
registers the driver is aware of. The static allocation for register
storage had falen behind badly.

Reported-by: Michael Bode <michael at bumbleB.de>
Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_drv.c | 20 +++++++++++++++++++-
 drivers/gpu/drm/tilcdc/tilcdc_drv.h |  2 +-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c 
b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 4908c1f..2f87263 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -139,11 +139,14 @@ static int tilcdc_unload(struct drm_device *dev)

        pm_runtime_disable(dev->dev);

+       kfree(priv->saved_register);
        kfree(priv);

        return 0;
 }

+static size_t tilcdc_num_regs(void);
+
 static int tilcdc_load(struct drm_device *dev, unsigned long flags)
 {
        struct platform_device *pdev = dev->platformdev;
@@ -155,7 +158,11 @@ static int tilcdc_load(struct drm_device *dev, unsigned 
long flags)
        int ret;

        priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-       if (!priv) {
+       if (priv)
+               priv->saved_register = kcalloc(sizeof(*priv->saved_register),
+                                              tilcdc_num_regs(), GFP_KERNEL);
+       if (!priv || !priv->saved_register) {
+               kfree(priv);
                dev_err(dev->dev, "failed to allocate private data\n");
                return -ENOMEM;
        }
@@ -345,6 +352,7 @@ fail_free_wq:

 fail_free_priv:
        dev->dev_private = NULL;
+       kfree(priv->saved_register);
        kfree(priv);
        return ret;
 }
@@ -467,6 +475,16 @@ static const struct {
                REG(2, true,  LCDC_INT_ENABLE_SET_REG),
 #undef REG
 };
+
+static size_t tilcdc_num_regs(void)
+{
+       return ARRAY_SIZE(registers);
+}
+#else
+static size_t tilcdc_num_regs(void)
+{
+       return 0;
+}
 #endif

 #ifdef CONFIG_DEBUG_FS
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.h 
b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
index e863ad0..bc94835 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.h
@@ -67,7 +67,7 @@ struct tilcdc_drm_private {
        uint32_t max_width;

        /* register contents saved across suspend/resume: */
-       u32 saved_register[12];
+       u32 *saved_register;

 #ifdef CONFIG_CPU_FREQ
        struct notifier_block freq_transition;
-- 
1.9.1