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MIPS: Alchemy: au1100fb: use clk framework

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Use the clock framework to en/disable the clock to the au1100
framebuffer device.

Signed-off-by: Manuel Lauss <[email protected]>
Cc: Linux-MIPS <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/7474/
Signed-off-by: Ralf Baechle <[email protected]>
This commit is contained in:
Manuel Lauss 2014-07-23 16:36:54 +02:00 • committed by Ralf Baechle
commit 6b1889c14b
3 changed files with 37 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

36
drivers/video/fbdev/au1100fb.c
View file

@ -41,6 +41,7 @@
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
@ -434,7 +435,7 @@ static int au1100fb_drv_probe(struct platform_device *dev)
struct au1100fb_device *fbdev = NULL;
struct resource *regs_res;
unsigned long page;
u32 sys_clksrc;
struct clk *c;
/* Allocate new device private */
fbdev = devm_kzalloc(&dev->dev, sizeof(struct au1100fb_device),
@ -473,6 +474,13 @@ static int au1100fb_drv_probe(struct platform_device *dev)
print_dbg("Register memory map at %p", fbdev->regs);
print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
c = clk_get(NULL, "lcd_intclk");
if (!IS_ERR(c)) {
fbdev->lcdclk = c;
clk_set_rate(c, 48000000);
clk_prepare_enable(c);
}
/* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
(fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
@ -506,11 +514,6 @@ static int au1100fb_drv_probe(struct platform_device *dev)
print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
/* Setup LCD clock to AUX (48 MHz) */
sys_clksrc = alchemy_rdsys(AU1000_SYS_CLKSRC);
sys_clksrc &= ~(SYS_CS_ML_MASK | SYS_CS_DL | SYS_CS_CL);
alchemy_wrsys((sys_clksrc | (1 << SYS_CS_ML_BIT)), AU1000_SYS_CLKSRC);
/* load the panel info into the var struct */
au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
au1100fb_var.xres = fbdev->panel->xres;
@ -547,6 +550,10 @@ static int au1100fb_drv_probe(struct platform_device *dev)
return 0;
failed:
if (fbdev->lcdclk) {
clk_disable_unprepare(fbdev->lcdclk);
clk_put(fbdev->lcdclk);
}
if (fbdev->fb_mem) {
dma_free_noncoherent(&dev->dev, fbdev->fb_len, fbdev->fb_mem,
fbdev->fb_phys);
@ -577,11 +584,15 @@ int au1100fb_drv_remove(struct platform_device *dev)
fb_dealloc_cmap(&fbdev->info.cmap);
if (fbdev->lcdclk) {
clk_disable_unprepare(fbdev->lcdclk);
clk_put(fbdev->lcdclk);
}
return 0;
}
#ifdef CONFIG_PM
static u32 sys_clksrc;
static struct au1100fb_regs fbregs;
int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
@ -591,14 +602,11 @@ int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
if (!fbdev)
return 0;
/* Save the clock source state */
sys_clksrc = alchemy_rdsys(AU1000_SYS_CLKSRC);
/* Blank the LCD */
au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
/* Stop LCD clocking */
alchemy_wrsys(sys_clksrc & ~SYS_CS_ML_MASK, AU1000_SYS_CLKSRC);
if (fbdev->lcdclk)
clk_disable(fbdev->lcdclk);
memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
@ -614,8 +622,8 @@ int au1100fb_drv_resume(struct platform_device *dev)
memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
/* Restart LCD clocking */
alchemy_wrsys(sys_clksrc, AU1000_SYS_CLKSRC);
if (fbdev->lcdclk)
clk_enable(fbdev->lcdclk);
/* Unblank the LCD */
au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);

1
drivers/video/fbdev/au1100fb.h
View file

@ -109,6 +109,7 @@ struct au1100fb_device {
size_t fb_len;
dma_addr_t fb_phys;
int panel_idx;
struct clk *lcdclk;
};
/********************************************************************/