Newer MFC hardware have internal clock gating feature, so additional software-triggered clock gating sometimes causes misbehavior of the MFC firmware and results in freeze or crash. This patch changes the driver to use software-triggered clock gating only when working with v5 MFC hardware, where it has been proven to work properly.
Signed-off-by: Marek Szyprowski <[email protected]> --- drivers/media/platform/s5p-mfc/s5p_mfc.c | 1 + drivers/media/platform/s5p-mfc/s5p_mfc_common.h | 2 ++ drivers/media/platform/s5p-mfc/s5p_mfc_pm.c | 17 +++++++++++++++-- 3 files changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c index 994a27b..7d39359 100644 --- a/drivers/media/platform/s5p-mfc/s5p_mfc.c +++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c @@ -1441,6 +1441,7 @@ static int s5p_mfc_runtime_resume(struct device *dev) .buf_size = &buf_size_v5, .buf_align = &mfc_buf_align_v5, .fw_name[0] = "s5p-mfc.fw", + .use_clock_gating = true, }; static struct s5p_mfc_buf_size_v6 mfc_buf_size_v6 = { diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_common.h b/drivers/media/platform/s5p-mfc/s5p_mfc_common.h index 46b99f2..c068ee3 100644 --- a/drivers/media/platform/s5p-mfc/s5p_mfc_common.h +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_common.h @@ -199,6 +199,7 @@ struct s5p_mfc_buf { struct s5p_mfc_pm { struct clk *clock; struct clk *clock_gate; + bool use_clock_gating; atomic_t power; struct device *device; }; @@ -235,6 +236,7 @@ struct s5p_mfc_variant { struct s5p_mfc_buf_size *buf_size; struct s5p_mfc_buf_align *buf_align; char *fw_name[MFC_FW_MAX_VERSIONS]; + bool use_clock_gating; }; /** diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c index 930dc2d..b5806ab 100644 --- a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c @@ -37,6 +37,7 @@ int s5p_mfc_init_pm(struct s5p_mfc_dev *dev) pm = &dev->pm; p_dev = dev; + pm->use_clock_gating = dev->variant->use_clock_gating; pm->clock_gate = clk_get(&dev->plat_dev->dev, MFC_GATE_CLK_NAME); if (IS_ERR(pm->clock_gate)) { mfc_err("Failed to get clock-gating control\n"); @@ -108,6 +109,8 @@ int s5p_mfc_clock_on(void) atomic_inc(&clk_ref); mfc_debug(3, "+ %d\n", atomic_read(&clk_ref)); #endif + if (!pm->use_clock_gating) + return 0; if (!IS_ERR_OR_NULL(pm->clock_gate)) ret = clk_enable(pm->clock_gate); return ret; @@ -119,22 +122,32 @@ void s5p_mfc_clock_off(void) atomic_dec(&clk_ref); mfc_debug(3, "- %d\n", atomic_read(&clk_ref)); #endif + if (!pm->use_clock_gating) + return; if (!IS_ERR_OR_NULL(pm->clock_gate)) clk_disable(pm->clock_gate); } int s5p_mfc_power_on(void) { + int ret = 0; + #ifdef CONFIG_PM - return pm_runtime_get_sync(pm->device); + ret = pm_runtime_get_sync(pm->device); + if (ret) + return ret; #else atomic_set(&pm->power, 1); - return 0; #endif + if (!pm->use_clock_gating && !IS_ERR_OR_NULL(pm->clock_gate)) + ret = clk_enable(pm->clock_gate); + return ret; } int s5p_mfc_power_off(void) { + if (!pm->use_clock_gating && !IS_ERR_OR_NULL(pm->clock_gate)) + clk_disable(pm->clock_gate); #ifdef CONFIG_PM return pm_runtime_put_sync(pm->device); #else -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
