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| author | Takashi Iwai <tiwai@suse.de> | 2014-09-11 13:43:16 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2014-09-11 13:43:49 +0200 |
| commit | 998052b74574699bdd1e451b6556e4d7667a7a4e (patch) | |
| tree | 3124898e873cdec28f724106e60d1bff760505f1 /drivers/video/fbdev/amba-clcd.c | |
| parent | sound: pci: au88x0: printk replacement (diff) | |
| parent | ALSA: hda - Fix invalid pin powermap without jack detection (diff) | |
| download | linux-998052b74574699bdd1e451b6556e4d7667a7a4e.tar.xz linux-998052b74574699bdd1e451b6556e4d7667a7a4e.zip | |
Merge branch 'for-linus' into for-next
Merging for-linus branch for syncing the latest STAC/IDT codec
changes to be affected by the upcoming hda-jack rewrites.
Diffstat (limited to 'drivers/video/fbdev/amba-clcd.c')
| -rw-r--r-- | drivers/video/fbdev/amba-clcd.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/drivers/video/fbdev/amba-clcd.c b/drivers/video/fbdev/amba-clcd.c index beadd3edaa17..a7b6217ac87b 100644 --- a/drivers/video/fbdev/amba-clcd.c +++ b/drivers/video/fbdev/amba-clcd.c @@ -24,6 +24,7 @@ #include <linux/list.h> #include <linux/amba/bus.h> #include <linux/amba/clcd.h> +#include <linux/bitops.h> #include <linux/clk.h> #include <linux/hardirq.h> #include <linux/dma-mapping.h> @@ -650,6 +651,7 @@ static int clcdfb_of_init_display(struct clcd_fb *fb) { struct device_node *endpoint; int err; + unsigned int bpp; u32 max_bandwidth; u32 tft_r0b0g0[3]; @@ -667,11 +669,22 @@ static int clcdfb_of_init_display(struct clcd_fb *fb) err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth", &max_bandwidth); - if (!err) - fb->panel->bpp = 8 * max_bandwidth / (fb->panel->mode.xres * - fb->panel->mode.yres * fb->panel->mode.refresh); - else - fb->panel->bpp = 32; + if (!err) { + /* + * max_bandwidth is in bytes per second and pixclock in + * pico-seconds, so the maximum allowed bits per pixel is + * 8 * max_bandwidth / (PICOS2KHZ(pixclock) * 1000) + * Rearrange this calculation to avoid overflow and then ensure + * result is a valid format. + */ + bpp = max_bandwidth / (1000 / 8) + / PICOS2KHZ(fb->panel->mode.pixclock); + bpp = rounddown_pow_of_two(bpp); + if (bpp > 32) + bpp = 32; + } else + bpp = 32; + fb->panel->bpp = bpp; #ifdef CONFIG_CPU_BIG_ENDIAN fb->panel->cntl |= CNTL_BEBO; |