On Wednesday 10 April 2013 02:49 PM, Tomi Valkeinen wrote:
On 2013-04-10 11:37, Archit Taneja wrote:
On Wednesday 10 April 2013 01:43 PM, Tomi Valkeinen wrote:
On 2013-04-08 11:55, Archit Taneja wrote:
Use devm_clk_get() instead of clk_get() for dss, and for outputs hdmi
and venc.
This reduces reduces code and simplifies error handling.
Signed-off-by: Archit Taneja <archit@xxxxxx>
---
drivers/video/omap2/dss/dss.c | 18 +++---------------
drivers/video/omap2/dss/hdmi.c | 16 ++--------------
drivers/video/omap2/dss/venc.c | 10 +---------
3 files changed, 6 insertions(+), 38 deletions(-)
diff --git a/drivers/video/omap2/dss/dss.c
b/drivers/video/omap2/dss/dss.c
index 054c2a2..645b3bc 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -767,13 +767,11 @@ int dss_dpi_select_source(enum omap_channel
channel)
static int dss_get_clocks(void)
{
struct clk *clk;
- int r;
- clk = clk_get(&dss.pdev->dev, "fck");
+ clk = devm_clk_get(&dss.pdev->dev, "fck");
if (IS_ERR(clk)) {
DSSERR("can't get clock fck\n");
- r = PTR_ERR(clk);
- goto err;
+ return PTR_ERR(clk);
}
dss.dss_clk = clk;
@@ -782,8 +780,7 @@ static int dss_get_clocks(void)
clk = clk_get(NULL, dss.feat->clk_name);
if (IS_ERR(clk)) {
DSSERR("Failed to get %s\n", dss.feat->clk_name);
- r = PTR_ERR(clk);
- goto err;
+ return PTR_ERR(clk);
}
} else {
clk = NULL;
@@ -792,21 +789,12 @@ static int dss_get_clocks(void)
dss.dpll4_m4_ck = clk;
return 0;
-
-err:
- if (dss.dss_clk)
- clk_put(dss.dss_clk);
- if (dss.dpll4_m4_ck)
- clk_put(dss.dpll4_m4_ck);
-
- return r;
}
Why didn't you use devm_clk_get for the dpll4_m4_ck clock also?
clk_get of dpll4_m4_ck isn't tied to a device:
clk = clk_get(NULL, dss.feat->clk_name);
We can't use devm_clk_get() if we don't tie it to a device, right?
Ah, true.
I think the dss.dss_clk clock above is same as the dpll4_m4_ck for all
OMAPs. We could probably remove the dpll4_m4_clk all together, and use
dss_clk to get the rate of DSS_FCK coming from PRCM.
Hmm, no, if I recall right, dpll4_m4_clk is the parent of dss clock (or
parent of the parent of...), and the dss_fck_multiplier affects the
resulting dss fck. Or something like that. It's a bit messy, especially
as we can't just use the dss fck to change the rate, we need to change
the rate at the parent for some reason.
Ah ok, I remember it now. One of the DPLL's divider's output is DSS_FCK.
We get the parent's rate and iterate through all the possible hsdivider
values to get the closest pixel clock. We don't/can't change
dpll4_m4_clk as such, we just need to know it's rate for our calculations.
So yes, we need dpll4_m4_clk, we just need to rename it to a better
thing. Like dss_clk_parent.
Anyway,
Archit
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