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path: root/drivers/video/omap2/dss/dss.c
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Diffstat (limited to 'drivers/video/omap2/dss/dss.c')
-rw-r--r--drivers/video/omap2/dss/dss.c376
1 files changed, 77 insertions, 299 deletions
diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 810ea8cbc1e6..a83c449d2ed1 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -29,6 +29,7 @@
#include <linux/seq_file.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <video/omapdss.h>
#include <plat/clock.h>
@@ -60,15 +61,11 @@ struct dss_reg {
static struct {
struct platform_device *pdev;
void __iomem *base;
+
int ctx_loss_cnt;
struct clk *dpll4_m4_ck;
- struct clk *dss_ick;
- struct clk *dss_fck;
- struct clk *dss_sys_clk;
- struct clk *dss_tv_fck;
- struct clk *dss_video_fck;
- unsigned num_clks_enabled;
+ struct clk *dss_clk;
unsigned long cache_req_pck;
unsigned long cache_prate;
@@ -88,13 +85,6 @@ static const char * const dss_generic_clk_source_names[] = {
[OMAP_DSS_CLK_SRC_FCK] = "DSS_FCK",
};
-static void dss_clk_enable_all_no_ctx(void);
-static void dss_clk_disable_all_no_ctx(void);
-static void dss_clk_enable_no_ctx(enum dss_clock clks);
-static void dss_clk_disable_no_ctx(enum dss_clock clks);
-
-static int _omap_dss_wait_reset(void);
-
static inline void dss_write_reg(const struct dss_reg idx, u32 val)
{
__raw_writel(val, dss.base + idx.idx);
@@ -110,12 +100,10 @@ static inline u32 dss_read_reg(const struct dss_reg idx)
#define RR(reg) \
dss_write_reg(DSS_##reg, dss.ctx[(DSS_##reg).idx / sizeof(u32)])
-void dss_save_context(void)
+static void dss_save_context(void)
{
- if (cpu_is_omap24xx())
- return;
+ DSSDBG("dss_save_context\n");
- SR(SYSCONFIG);
SR(CONTROL);
if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
@@ -125,12 +113,10 @@ void dss_save_context(void)
}
}
-void dss_restore_context(void)
+static void dss_restore_context(void)
{
- if (_omap_dss_wait_reset())
- DSSERR("DSS not coming out of reset after sleep\n");
+ DSSDBG("dss_restore_context\n");
- RR(SYSCONFIG);
RR(CONTROL);
if (dss_feat_get_supported_displays(OMAP_DSS_CHANNEL_LCD) &
@@ -235,6 +221,7 @@ const char *dss_get_generic_clk_source_name(enum omap_dss_clk_source clk_src)
return dss_generic_clk_source_names[clk_src];
}
+
void dss_dump_clocks(struct seq_file *s)
{
unsigned long dpll4_ck_rate;
@@ -242,13 +229,14 @@ void dss_dump_clocks(struct seq_file *s)
const char *fclk_name, *fclk_real_name;
unsigned long fclk_rate;
- dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
+ if (dss_runtime_get())
+ return;
seq_printf(s, "- DSS -\n");
fclk_name = dss_get_generic_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
fclk_real_name = dss_feat_get_clk_source_name(OMAP_DSS_CLK_SRC_FCK);
- fclk_rate = dss_clk_get_rate(DSS_CLK_FCK);
+ fclk_rate = clk_get_rate(dss.dss_clk);
if (dss.dpll4_m4_ck) {
dpll4_ck_rate = clk_get_rate(clk_get_parent(dss.dpll4_m4_ck));
@@ -274,14 +262,15 @@ void dss_dump_clocks(struct seq_file *s)
fclk_rate);
}
- dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
+ dss_runtime_put();
}
void dss_dump_regs(struct seq_file *s)
{
#define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
- dss_clk_enable(DSS_CLK_ICK | DSS_CLK_FCK);
+ if (dss_runtime_get())
+ return;
DUMPREG(DSS_REVISION);
DUMPREG(DSS_SYSCONFIG);
@@ -295,7 +284,7 @@ void dss_dump_regs(struct seq_file *s)
DUMPREG(DSS_SDI_STATUS);
}
- dss_clk_disable(DSS_CLK_ICK | DSS_CLK_FCK);
+ dss_runtime_put();
#undef DUMPREG
}
@@ -438,7 +427,7 @@ int dss_calc_clock_rates(struct dss_clock_info *cinfo)
} else {
if (cinfo->fck_div != 0)
return -EINVAL;
- cinfo->fck = dss_clk_get_rate(DSS_CLK_FCK);
+ cinfo->fck = clk_get_rate(dss.dss_clk);
}
return 0;
@@ -468,7 +457,7 @@ int dss_set_clock_div(struct dss_clock_info *cinfo)
int dss_get_clock_div(struct dss_clock_info *cinfo)
{
- cinfo->fck = dss_clk_get_rate(DSS_CLK_FCK);
+ cinfo->fck = clk_get_rate(dss.dss_clk);
if (dss.dpll4_m4_ck) {
unsigned long prate;
@@ -513,7 +502,7 @@ int dss_calc_clock_div(bool is_tft, unsigned long req_pck,
max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
- fck = dss_clk_get_rate(DSS_CLK_FCK);
+ fck = clk_get_rate(dss.dss_clk);
if (req_pck == dss.cache_req_pck &&
((cpu_is_omap34xx() && prate == dss.cache_prate) ||
dss.cache_dss_cinfo.fck == fck)) {
@@ -540,7 +529,7 @@ retry:
if (dss.dpll4_m4_ck == NULL) {
struct dispc_clock_info cur_dispc;
/* XXX can we change the clock on omap2? */
- fck = dss_clk_get_rate(DSS_CLK_FCK);
+ fck = clk_get_rate(dss.dss_clk);
fck_div = 1;
dispc_find_clk_divs(is_tft, req_pck, fck, &cur_dispc);
@@ -617,28 +606,6 @@ found:
return 0;
}
-static int _omap_dss_wait_reset(void)
-{
- int t = 0;
-
- while (REG_GET(DSS_SYSSTATUS, 0, 0) == 0) {
- if (++t > 1000) {
- DSSERR("soft reset failed\n");
- return -ENODEV;
- }
- udelay(1);
- }
-
- return 0;
-}
-
-static int _omap_dss_reset(void)
-{
- /* Soft reset */
- REG_FLD_MOD(DSS_SYSCONFIG, 1, 1, 1);
- return _omap_dss_wait_reset();
-}
-
void dss_set_venc_output(enum omap_dss_venc_type type)
{
int l = 0;
@@ -719,131 +686,45 @@ static bool dss_need_ctx_restore(void)
return true;
}
-static void save_all_ctx(void)
-{
- DSSDBG("save context\n");
-
- dss_clk_enable_no_ctx(DSS_CLK_ICK | DSS_CLK_FCK);
-
- dss_save_context();
- dispc_save_context();
-#ifdef CONFIG_OMAP2_DSS_DSI
- dsi_save_context();
-#endif
-
- dss_clk_disable_no_ctx(DSS_CLK_ICK | DSS_CLK_FCK);
-}
-
-static void restore_all_ctx(void)
-{
- DSSDBG("restore context\n");
-
- dss_clk_enable_all_no_ctx();
-
- dss_restore_context();
- dispc_restore_context();
-#ifdef CONFIG_OMAP2_DSS_DSI
- dsi_restore_context();
-#endif
-
- dss_clk_disable_all_no_ctx();
-}
-
-static int dss_get_clock(struct clk **clock, const char *clk_name)
-{
- struct clk *clk;
-
- clk = clk_get(&dss.pdev->dev, clk_name);
-
- if (IS_ERR(clk)) {
- DSSERR("can't get clock %s", clk_name);
- return PTR_ERR(clk);
- }
-
- *clock = clk;
-
- DSSDBG("clk %s, rate %ld\n", clk_name, clk_get_rate(clk));
-
- return 0;
-}
-
static int dss_get_clocks(void)
{
+ struct clk *clk;
int r;
- struct clk *dpll4_m4_ck;
- struct omap_display_platform_data *pdata = dss.pdev->dev.platform_data;
-
- dss.dss_ick = NULL;
- dss.dss_fck = NULL;
- dss.dss_sys_clk = NULL;
- dss.dss_tv_fck = NULL;
- dss.dss_video_fck = NULL;
-
- r = dss_get_clock(&dss.dss_ick, "ick");
- if (r)
- goto err;
- r = dss_get_clock(&dss.dss_fck, "fck");
- if (r)
- goto err;
-
- if (!pdata->opt_clock_available) {
- r = -ENODEV;
+ clk = clk_get(&dss.pdev->dev, "fck");
+ if (IS_ERR(clk)) {
+ DSSERR("can't get clock fck\n");
+ r = PTR_ERR(clk);
goto err;
}
- if (pdata->opt_clock_available("sys_clk")) {
- r = dss_get_clock(&dss.dss_sys_clk, "sys_clk");
- if (r)
- goto err;
- }
-
- if (pdata->opt_clock_available("tv_clk")) {
- r = dss_get_clock(&dss.dss_tv_fck, "tv_clk");
- if (r)
- goto err;
- }
-
- if (pdata->opt_clock_available("video_clk")) {
- r = dss_get_clock(&dss.dss_video_fck, "video_clk");
- if (r)
- goto err;
- }
+ dss.dss_clk = clk;
if (cpu_is_omap34xx()) {
- dpll4_m4_ck = clk_get(NULL, "dpll4_m4_ck");
- if (IS_ERR(dpll4_m4_ck)) {
+ clk = clk_get(NULL, "dpll4_m4_ck");
+ if (IS_ERR(clk)) {
DSSERR("Failed to get dpll4_m4_ck\n");
- r = PTR_ERR(dpll4_m4_ck);
+ r = PTR_ERR(clk);
goto err;
}
} else if (cpu_is_omap44xx()) {
- dpll4_m4_ck = clk_get(NULL, "dpll_per_m5x2_ck");
- if (IS_ERR(dpll4_m4_ck)) {
+ clk = clk_get(NULL, "dpll_per_m5x2_ck");
+ if (IS_ERR(clk)) {
DSSERR("Failed to get dpll_per_m5x2_ck\n");
- r = PTR_ERR(dpll4_m4_ck);
+ r = PTR_ERR(clk);
goto err;
}
} else { /* omap24xx */
- dpll4_m4_ck = NULL;
+ clk = NULL;
}
- dss.dpll4_m4_ck = dpll4_m4_ck;
-
+ dss.dpll4_m4_ck = clk;
return 0;
err:
- if (dss.dss_ick)
- clk_put(dss.dss_ick);
- if (dss.dss_fck)
- clk_put(dss.dss_fck);
- if (dss.dss_sys_clk)
- clk_put(dss.dss_sys_clk);
- if (dss.dss_tv_fck)
- clk_put(dss.dss_tv_fck);
- if (dss.dss_video_fck)
- clk_put(dss.dss_video_fck);
+ if (dss.dss_clk)
+ clk_put(dss.dss_clk);
if (dss.dpll4_m4_ck)
clk_put(dss.dpll4_m4_ck);
@@ -854,139 +735,28 @@ static void dss_put_clocks(void)
{
if (dss.dpll4_m4_ck)
clk_put(dss.dpll4_m4_ck);
- if (dss.dss_video_fck)
- clk_put(dss.dss_video_fck);
- if (dss.dss_tv_fck)
- clk_put(dss.dss_tv_fck);
- if (dss.dss_sys_clk)
- clk_put(dss.dss_sys_clk);
- clk_put(dss.dss_fck);
- clk_put(dss.dss_ick);
-}
-
-unsigned long dss_clk_get_rate(enum dss_clock clk)
-{
- switch (clk) {
- case DSS_CLK_ICK:
- return clk_get_rate(dss.dss_ick);
- case DSS_CLK_FCK:
- return clk_get_rate(dss.dss_fck);
- case DSS_CLK_SYSCK:
- return clk_get_rate(dss.dss_sys_clk);
- case DSS_CLK_TVFCK:
- return clk_get_rate(dss.dss_tv_fck);
- case DSS_CLK_VIDFCK:
- return clk_get_rate(dss.dss_video_fck);
- }
-
- BUG();
- return 0;
+ clk_put(dss.dss_clk);
}
-static unsigned count_clk_bits(enum dss_clock clks)
+int dss_runtime_get(void)
{
- unsigned num_clks = 0;
-
- if (clks & DSS_CLK_ICK)
- ++num_clks;
- if (clks & DSS_CLK_FCK)
- ++num_clks;
- if (clks & DSS_CLK_SYSCK)
- ++num_clks;
- if (clks & DSS_CLK_TVFCK)
- ++num_clks;
- if (clks & DSS_CLK_VIDFCK)
- ++num_clks;
-
- return num_clks;
-}
-
-static void dss_clk_enable_no_ctx(enum dss_clock clks)
-{
- unsigned num_clks = count_clk_bits(clks);
-
- if (clks & DSS_CLK_ICK)
- clk_enable(dss.dss_ick);
- if (clks & DSS_CLK_FCK)
- clk_enable(dss.dss_fck);
- if ((clks & DSS_CLK_SYSCK) && dss.dss_sys_clk)
- clk_enable(dss.dss_sys_clk);
- if ((clks & DSS_CLK_TVFCK) && dss.dss_tv_fck)
- clk_enable(dss.dss_tv_fck);
- if ((clks & DSS_CLK_VIDFCK) && dss.dss_video_fck)
- clk_enable(dss.dss_video_fck);
-
- dss.num_clks_enabled += num_clks;
-}
-
-void dss_clk_enable(enum dss_clock clks)
-{
- bool check_ctx = dss.num_clks_enabled == 0;
-
- dss_clk_enable_no_ctx(clks);
-
- /*
- * HACK: On omap4 the registers may not be accessible right after
- * enabling the clocks. At some point this will be handled by
- * pm_runtime, but for the time begin this should make things work.
- */
- if (cpu_is_omap44xx() && check_ctx)
- udelay(10);
-
- if (check_ctx && cpu_is_omap34xx() && dss_need_ctx_restore())
- restore_all_ctx();
-}
-
-static void dss_clk_disable_no_ctx(enum dss_clock clks)
-{
- unsigned num_clks = count_clk_bits(clks);
-
- if (clks & DSS_CLK_ICK)
- clk_disable(dss.dss_ick);
- if (clks & DSS_CLK_FCK)
- clk_disable(dss.dss_fck);
- if ((clks & DSS_CLK_SYSCK) && dss.dss_sys_clk)
- clk_disable(dss.dss_sys_clk);
- if ((clks & DSS_CLK_TVFCK) && dss.dss_tv_fck)
- clk_disable(dss.dss_tv_fck);
- if ((clks & DSS_CLK_VIDFCK) && dss.dss_video_fck)
- clk_disable(dss.dss_video_fck);
-
- dss.num_clks_enabled -= num_clks;
-}
-
-void dss_clk_disable(enum dss_clock clks)
-{
- if (cpu_is_omap34xx()) {
- unsigned num_clks = count_clk_bits(clks);
-
- BUG_ON(dss.num_clks_enabled < num_clks);
+ int r;
- if (dss.num_clks_enabled == num_clks)
- save_all_ctx();
- }
+ DSSDBG("dss_runtime_get\n");
- dss_clk_disable_no_ctx(clks);
+ r = pm_runtime_get_sync(&dss.pdev->dev);
+ WARN_ON(r < 0);
+ return r < 0 ? r : 0;
}
-static void dss_clk_enable_all_no_ctx(void)
+void dss_runtime_put(void)
{
- enum dss_clock clks;
-
- clks = DSS_CLK_ICK | DSS_CLK_FCK | DSS_CLK_SYSCK | DSS_CLK_TVFCK;
- if (cpu_is_omap34xx())
- clks |= DSS_CLK_VIDFCK;
- dss_clk_enable_no_ctx(clks);
-}
+ int r;
-static void dss_clk_disable_all_no_ctx(void)
-{
- enum dss_clock clks;
+ DSSDBG("dss_runtime_put\n");
- clks = DSS_CLK_ICK | DSS_CLK_FCK | DSS_CLK_SYSCK | DSS_CLK_TVFCK;
- if (cpu_is_omap34xx())
- clks |= DSS_CLK_VIDFCK;
- dss_clk_disable_no_ctx(clks);
+ r = pm_runtime_put(&dss.pdev->dev);
+ WARN_ON(r < 0);
}
/* DEBUGFS */
@@ -1001,7 +771,6 @@ void dss_debug_dump_clocks(struct seq_file *s)
}
#endif
-
/* DSS HW IP initialisation */
static int omap_dsshw_probe(struct platform_device *pdev)
{
@@ -1028,19 +797,13 @@ static int omap_dsshw_probe(struct platform_device *pdev)
if (r)
goto err_clocks;
- dss_clk_enable_all_no_ctx();
-
dss_init_ctx_loss_count();
- /* disable LCD and DIGIT output. This seems to fix the synclost
- * problem that we get, if the bootloader starts the DSS and
- * the kernel resets it */
- omap_writel(omap_readl(0x48050440) & ~0x3, 0x48050440);
+ pm_runtime_enable(&pdev->dev);
- _omap_dss_reset();
-
- /* autoidle */
- REG_FLD_MOD(DSS_SYSCONFIG, 1, 0, 0);
+ r = dss_runtime_get();
+ if (r)
+ goto err_runtime_get;
/* Select DPLL */
REG_FLD_MOD(DSS_CONTROL, 0, 0, 0);
@@ -1068,19 +831,19 @@ static int omap_dsshw_probe(struct platform_device *pdev)
goto err_sdi;
}
- dss_save_context();
-
rev = dss_read_reg(DSS_REVISION);
printk(KERN_INFO "OMAP DSS rev %d.%d\n",
FLD_GET(rev, 7, 4), FLD_GET(rev, 3, 0));
- dss_clk_disable_all_no_ctx();
+ dss_runtime_put();
return 0;
err_sdi:
dpi_exit();
err_dpi:
- dss_clk_disable_all_no_ctx();
+ dss_runtime_put();
+err_runtime_get:
+ pm_runtime_disable(&pdev->dev);
dss_put_clocks();
err_clocks:
iounmap(dss.base);
@@ -1095,25 +858,40 @@ static int omap_dsshw_remove(struct platform_device *pdev)
iounmap(dss.base);
- /*
- * As part of hwmod changes, DSS is not the only controller of dss
- * clocks; hwmod framework itself will also enable clocks during hwmod
- * init for dss, and autoidle is set in h/w for DSS. Hence, there's no
- * need to disable clocks if their usecounts > 1.
- */
- WARN_ON(dss.num_clks_enabled > 0);
+ pm_runtime_disable(&pdev->dev);
dss_put_clocks();
return 0;
}
+static int dss_runtime_suspend(struct device *dev)
+{
+ dss_save_context();
+ clk_disable(dss.dss_clk);
+ return 0;
+}
+
+static int dss_runtime_resume(struct device *dev)
+{
+ clk_enable(dss.dss_clk);
+ if (dss_need_ctx_restore())
+ dss_restore_context();
+ return 0;
+}
+
+static const struct dev_pm_ops dss_pm_ops = {
+ .runtime_suspend = dss_runtime_suspend,
+ .runtime_resume = dss_runtime_resume,
+};
+
static struct platform_driver omap_dsshw_driver = {
.probe = omap_dsshw_probe,
.remove = omap_dsshw_remove,
.driver = {
.name = "omapdss_dss",
.owner = THIS_MODULE,
+ .pm = &dss_pm_ops,
},
};

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