From d19f405a5a8d2ed942b40f8cf7929a5a50d0cc59 Mon Sep 17 00:00:00 2001 From: Jacek Anaszewski Date: Thu, 10 Jul 2014 06:00:39 -0300 Subject: [PATCH] [media] s5p-mfc: Fix selective sclk_mfc init fc906b6d "Remove special clock usage in driver" removed initialization of MFC special clock, arguing that there's no need to do it explicitly, since it's one of MFC gate clock's dependencies and gets enabled along with it. However, there's no promise of keeping this hierarchy across Exynos SoC releases, therefore this approach fails to provide a stable, portable solution. Out of all MFC versions, only v6 doesn't use special clock at all. For other versions log a message only in case clk_get fails, as not all the devices with the same MFC version require initializing the clock explicitly. Signed-off-by: Mateusz Zalega Signed-off-by: Seung-Woo Kim Signed-off-by: Jacek Anaszewski Signed-off-by: Kyungmin Park Signed-off-by: Kamil Debski Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/s5p-mfc/s5p_mfc_pm.c | 24 +++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c index 11d5f1dada32..b6a8be97a96c 100644 --- a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c @@ -21,6 +21,8 @@ #include "s5p_mfc_pm.h" #define MFC_GATE_CLK_NAME "mfc" +#define MFC_SCLK_NAME "sclk-mfc" +#define MFC_SCLK_RATE (200 * 1000000) #define CLK_DEBUG @@ -50,6 +52,20 @@ int s5p_mfc_init_pm(struct s5p_mfc_dev *dev) goto err_p_ip_clk; } + if (dev->variant->version != MFC_VERSION_V6) { + pm->clock = clk_get(&dev->plat_dev->dev, MFC_SCLK_NAME); + if (IS_ERR(pm->clock)) { + mfc_info("Failed to get MFC special clock control\n"); + } else { + clk_set_rate(pm->clock, MFC_SCLK_RATE); + ret = clk_prepare_enable(pm->clock); + if (ret) { + mfc_err("Failed to enable MFC special clock\n"); + goto err_s_clk; + } + } + } + atomic_set(&pm->power, 0); #ifdef CONFIG_PM_RUNTIME pm->device = &dev->plat_dev->dev; @@ -59,6 +75,9 @@ int s5p_mfc_init_pm(struct s5p_mfc_dev *dev) atomic_set(&clk_ref, 0); #endif return 0; + +err_s_clk: + clk_put(pm->clock); err_p_ip_clk: clk_put(pm->clock_gate); err_g_ip_clk: @@ -67,6 +86,11 @@ int s5p_mfc_init_pm(struct s5p_mfc_dev *dev) void s5p_mfc_final_pm(struct s5p_mfc_dev *dev) { + if (dev->variant->version != MFC_VERSION_V6 && + pm->clock) { + clk_disable_unprepare(pm->clock); + clk_put(pm->clock); + } clk_unprepare(pm->clock_gate); clk_put(pm->clock_gate); #ifdef CONFIG_PM_RUNTIME -- GitLab