[PATCH 1/4] ARM STM/i.MX: Allocate memory for framebuffer during probe

[Gregory CLEMENT <gregory.clement@free-electrons.com>]

With current code when the framebuffer is register, screen_base is not
set yet. So when we want to access framebuffer from mmap we get a
pointer to 0x0 instead of getting the pointer to the framebuffer
address. This patch fix this bug by allocating memory for framebuffer
during probe just before registering framebuffer driver.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
 drivers/video/stm.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/video/stm.c b/drivers/video/stm.c
index f0abe4c..8a9acff 100644
--- a/drivers/video/stm.c
+++ b/drivers/video/stm.c
@@ -480,6 +480,7 @@ static int stmfb_probe(struct device_d *hw_dev)
 {
 	struct imx_fb_videomode *pdata = hw_dev->platform_data;
 	int ret;
+	unsigned size;
 
 	/* just init */
 	fbi.info.priv = &fbi;
@@ -497,6 +498,15 @@ static int stmfb_probe(struct device_d *hw_dev)
 	fbi.info.yres = fbi.info.mode->yres;
 	fbi.info.bits_per_pixel = 16;
 
+	size = calc_line_length(fbi.info.mode->xres, fbi.info.bits_per_pixel) *
+		fbi.info.mode->yres;
+
+	ret = stmfb_memory_mmgt(&fbi.info, size);
+	if (ret != 0) {
+		dev_err(hw_dev, "Cannot allocate framebuffer memory\n");
+		return ret;
+	}
+
 	ret = register_framebuffer(&fbi.info);
 	if (ret != 0) {
 		dev_err(hw_dev, "Failed to register framebuffer\n");
-- 
1.7.0.4




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