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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2010-09-03 07:20:23 +0000
committerPaul Mundt <lethal@linux-sh.org>2010-09-14 17:23:21 +0900
commit6de9edd5bde0cdfea12e9948690e53ec669c3018 (patch)
tree638602a3d7726b27ae6ab85ef45f4f11c38c0283 /drivers/video/sh_mobile_lcdcfb.h
parent89712699d7bc9cc93602407e0e9bc2490b771400 (diff)
downloadlinux-6de9edd5bde0cdfea12e9948690e53ec669c3018.tar.gz
fbdev: sh_mobile_hdmi: implement locking
The SH-Mobile HDMI driver runs in several contexts: ISR, delayed work-queue, task context, when called from the sh_mobile_lcdc framebuffer driver. This creates ample race possibilities. Even though most these races are purely theoretical, it is better to close them. To trace fb_info validity we install a notification callback in the HDMI driver, and the only way for it to get to driver internal data is by using struct sh_mobile_lcdc_chan, therefore it had to be extracted into a separate common header. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/sh_mobile_lcdcfb.h')
-rw-r--r--drivers/video/sh_mobile_lcdcfb.h37
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/video/sh_mobile_lcdcfb.h b/drivers/video/sh_mobile_lcdcfb.h
new file mode 100644
index 00000000000..6fcfc0ffe3f
--- /dev/null
+++ b/drivers/video/sh_mobile_lcdcfb.h
@@ -0,0 +1,37 @@
+#ifndef SH_MOBILE_LCDCFB_H
+#define SH_MOBILE_LCDCFB_H
+
+#include <linux/completion.h>
+#include <linux/fb.h>
+#include <linux/wait.h>
+
+/* per-channel registers */
+enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
+ LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR,
+ LDHAJR,
+ NR_CH_REGS };
+
+#define PALETTE_NR 16
+
+struct sh_mobile_lcdc_priv;
+struct fb_info;
+
+struct sh_mobile_lcdc_chan {
+ struct sh_mobile_lcdc_priv *lcdc;
+ unsigned long *reg_offs;
+ unsigned long ldmt1r_value;
+ unsigned long enabled; /* ME and SE in LDCNT2R */
+ struct sh_mobile_lcdc_chan_cfg cfg;
+ u32 pseudo_palette[PALETTE_NR];
+ unsigned long saved_ch_regs[NR_CH_REGS];
+ struct fb_info *info;
+ dma_addr_t dma_handle;
+ struct fb_deferred_io defio;
+ struct scatterlist *sglist;
+ unsigned long frame_end;
+ unsigned long pan_offset;
+ wait_queue_head_t frame_end_wait;
+ struct completion vsync_completion;
+};
+
+#endif