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ARM: 8244/1: fbdev: sa1100fb: make use of device clock 

Use per-device clock (instead of calling cpufreq_get(0), which can
return 0 if no cpu frequency driver is selected) to program timings.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Acked-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Dmitry Eremin-Solenikov 2014-12-03 18:36:53 +01:00 committed by Russell King
parent 7faf6d1ab0
commit 23834a4116
2 changed files with 24 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/video/fbdev/sa1100fb.c
View File

@ -178,6 +178,7 @@
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <video/sa1100fb.h>
@ -416,9 +417,9 @@ sa1100fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
var->transp.offset);
#ifdef CONFIG_CPU_FREQ
dev_dbg(fbi->dev, "dma period = %d ps, clock = %d kHz\n",
dev_dbg(fbi->dev, "dma period = %d ps, clock = %ld kHz\n",
sa1100fb_display_dma_period(var),
cpufreq_get(smp_processor_id()));
clk_get_rate(fbi->clk) / 1000);
#endif
return 0;
@ -592,9 +593,10 @@ static struct fb_ops sa1100fb_ops = {
* Calculate the PCD value from the clock rate (in picoseconds).
* We take account of the PPCR clock setting.
*/
static inline unsigned int get_pcd(unsigned int pixclock, unsigned int cpuclock)
static inline unsigned int get_pcd(struct sa1100fb_info *fbi,
unsigned int pixclock)
{
unsigned int pcd = cpuclock / 100;
unsigned int pcd = clk_get_rate(fbi->clk) / 100 / 1000;
pcd *= pixclock;
pcd /= 10000000;
@ -673,7 +675,7 @@ static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_
LCCR2_BegFrmDel(var->upper_margin) +
LCCR2_EndFrmDel(var->lower_margin);
pcd = get_pcd(var->pixclock, cpufreq_get(0));
pcd = get_pcd(fbi, var->pixclock);
new_regs.lccr3 = LCCR3_PixClkDiv(pcd) | fbi->inf->lccr3 |
(var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
(var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
@ -787,6 +789,9 @@ static void sa1100fb_enable_controller(struct sa1100fb_info *fbi)
fbi->palette_cpu[0] &= 0xcfff;
fbi->palette_cpu[0] |= palette_pbs(&fbi->fb.var);
/* enable LCD controller clock */
clk_prepare_enable(fbi->clk);
/* Sequence from 11.7.10 */
writel_relaxed(fbi->reg_lccr3, fbi->base + LCCR3);
writel_relaxed(fbi->reg_lccr2, fbi->base + LCCR2);
@ -831,6 +836,9 @@ static void sa1100fb_disable_controller(struct sa1100fb_info *fbi)
schedule_timeout(20 * HZ / 1000);
remove_wait_queue(&fbi->ctrlr_wait, &wait);
/* disable LCD controller clock */
clk_disable_unprepare(fbi->clk);
}
/*
@ -1009,7 +1017,6 @@ sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val,
void *data)
{
struct sa1100fb_info *fbi = TO_INF(nb, freq_transition);
struct cpufreq_freqs *f = data;
u_int pcd;
switch (val) {
@ -1018,7 +1025,7 @@ sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val,
break;
case CPUFREQ_POSTCHANGE:
pcd = get_pcd(fbi->fb.var.pixclock, f->new);
pcd = get_pcd(fbi, fbi->fb.var.pixclock);
fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
break;
@ -1225,6 +1232,13 @@ static int sa1100fb_probe(struct platform_device *pdev)
if (!fbi)
goto failed;
fbi->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(fbi->clk)) {
ret = PTR_ERR(fbi->clk);
fbi->clk = NULL;
goto failed;
}
fbi->base = ioremap(res->start, resource_size(res));
if (!fbi->base)
goto failed;
@ -1277,6 +1291,8 @@ static int sa1100fb_probe(struct platform_device *pdev)
failed:
if (fbi)
iounmap(fbi->base);
if (fbi->clk)
clk_put(fbi->clk);
kfree(fbi);
release_mem_region(res->start, resource_size(res));
return ret;

1
drivers/video/fbdev/sa1100fb.h
View File

@ -68,6 +68,7 @@ struct sa1100fb_info {
#endif
const struct sa1100fb_mach_info *inf;
struct clk *clk;
};
#define TO_INF(ptr,member) container_of(ptr,struct sa1100fb_info,member)