Use the clock framework to en/disable the clock to the au1100
framebuffer device.
Signed-off-by: Manuel Lauss <manuel.lauss@xxxxxxxxx>
---
arch/mips/alchemy/devboards/db1000.c | 14 ++++++++++++++
drivers/video/fbdev/au1100fb.c | 36 ++++++++++++++++++++++--------------
drivers/video/fbdev/au1100fb.h | 1 +
3 files changed, 37 insertions(+), 14 deletions(-)
diff --git a/arch/mips/alchemy/devboards/db1000.c b/arch/mips/alchemy/devboards/db1000.c
index 8201f00..001102e 100644
--- a/arch/mips/alchemy/devboards/db1000.c
+++ b/arch/mips/alchemy/devboards/db1000.c
@@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>
#include <linux/init.h>
@@ -496,6 +497,7 @@ int __init db1000_dev_setup(void)
int board = BCSR_WHOAMI_BOARD(bcsr_read(BCSR_WHOAMI));
int c0, c1, d0, d1, s0, s1, flashsize = 32, twosocks = 1;
unsigned long pfc;
+ struct clk *c, *p;
if (board == BCSR_WHOAMI_DB1500) {
c0 = AU1500_GPIO2_INT;
@@ -525,6 +527,18 @@ int __init db1000_dev_setup(void)
spi_register_board_info(db1100_spi_info,
ARRAY_SIZE(db1100_spi_info));
+ /* link LCD clock to AUXPLL */
+ p = clk_get(NULL, "auxpll_clk");
+ c = clk_get(NULL, "lcd_intclk");
+ if (!IS_ERR(c) && !IS_ERR(p)) {
+ clk_set_parent(c, p);
+ clk_set_rate(c, clk_get_rate(p));
+ }
+ if (!IS_ERR(c))
+ clk_put(c);
+ if (!IS_ERR(p))
+ clk_put(p);
+
platform_add_devices(db1100_devs, ARRAY_SIZE(db1100_devs));
platform_device_register(&db1100_spi_dev);
} else if (board == BCSR_WHOAMI_DB1000) {
diff --git a/drivers/video/fbdev/au1100fb.c b/drivers/video/fbdev/au1100fb.c
index c163424..0676746e 100644
--- a/drivers/video/fbdev/au1100fb.c
+++ b/drivers/video/fbdev/au1100fb.c
@@ -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);
diff --git a/drivers/video/fbdev/au1100fb.h b/drivers/video/fbdev/au1100fb.h
index 12d9642..9af1993 100644
--- a/drivers/video/fbdev/au1100fb.h
+++ b/drivers/video/fbdev/au1100fb.h
@@ -109,6 +109,7 @@ struct au1100fb_device {
size_t fb_len;
dma_addr_t fb_phys;
int panel_idx;
+ struct clk *lcdclk;
};
/********************************************************************/
--
2.0.1
