Re: [PATCH v2] drm/exynos: enable FIMD clocks

Hi,

On 27 March 2013 15:53, Inki Dae inki.dae@samsung.com wrote:

2013/3/20 Vikas Sajjan vikas.sajjan@linaro.org:

...

While migrating to common clock framework (CCF), found that the FIMD clocks were pulled down by the CCF. If CCF finds any clock(s) which has NOT been claimed by any of the drivers, then such clock(s) are PULLed low by CCF.

By calling clk_prepare_enable() for FIMD clocks fixes the issue.

this patch also replaces clk_disable() with clk_disable_unprepare() during exit.

Signed-off-by: Vikas Sajjan vikas.sajjan@linaro.org

Changes since v1: - added error checking for clk_prepare_enable() and also replaced clk_disable() with clk_disable_unprepare() during exit.

---

drivers/gpu/drm/exynos/exynos_drm_fimd.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c index 9537761..014d750 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c @@ -934,6 +934,19 @@ static int fimd_probe(struct platform_device *pdev) return ret; }

•   ret = clk_prepare_enable(ctx->lcd_clk);
  

•   if (ret) {
  

•           dev_err(dev, "failed to enable 'sclk_fimd' clock\n");
  

•           return ret;
  

•   }
  

•   ret = clk_prepare_enable(ctx->bus_clk);
  

•   if (ret) {
  

•           clk_disable_unprepare(ctx->lcd_clk);
  

•           dev_err(dev, "failed to enable 'fimd' clock\n");
  

•           return ret;
  

•   }
  

Please remove the above two clk_prepare_enable function calls and use them in fimd_clock() instead of clk_enable/disable(). When probed, fimd clock will be enabled by runtime pm.

Sure, will modify and resend.

Thanks, Inki Dae

...

    ctx->vidcon0 = pdata->vidcon0;
    ctx->vidcon1 = pdata->vidcon1;
    ctx->default_win = pdata->default_win;

@@ -981,8 +994,8 @@ static int fimd_remove(struct platform_device *pdev) if (ctx->suspended) goto out;

•   clk_disable(ctx->lcd_clk);
  

•   clk_disable(ctx->bus_clk);
  

•   clk_disable_unprepare(ctx->lcd_clk);
  

•   clk_disable_unprepare(ctx->bus_clk);
  
    pm_runtime_set_suspended(dev);
    pm_runtime_put_sync(dev);
  

-- 1.7.9.5

---

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