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ENGR00125259 - EPDC fb: Random display artifacts in unit tests

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Random artifacts were caused by corruption of the EPDC working
buffer.  This occurred because the working buffer was being
allocated too small.  This meant other accesses to FB-maintained
buffers was corrupting the working buffer and causing random
data to be drawn to the display.  Fixing the working buffer size
causes the artifacts to disappear.

Signed-off-by: Danny Nold <dannynold@freescale.com>
This commit is contained in:
Danny Nold
2010-07-16 16:57:39 -05:00
committed by Matt Sealey
parent 0662eac555
commit f58fd8d654
1 changed files with 2 additions and 2 deletions
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4
drivers/video/mxc/mxc_epdc_fb.c
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@@ -2561,10 +2561,10 @@ int __devinit mxc_epdc_fb_probe(struct platform_device *pdev)
upd_list->size, upd_list->phys_addr);
}
fb_data->working_buffer_size = pentry->y_res * pentry->x_res / 2;
fb_data->working_buffer_size = pentry->y_res * pentry->x_res * 2;
/* Allocate memory for EPDC working buffer */
fb_data->working_buffer_virt =
dma_alloc_coherent(&pdev->dev, pentry->y_res * pentry->x_res / 2,
dma_alloc_coherent(&pdev->dev, fb_data->working_buffer_size,
&fb_data->working_buffer_phys, GFP_DMA);
if (fb_data->working_buffer_virt == NULL) {
dev_err(&pdev->dev, "Can't allocate mem for working buf!\n");