From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter De Schrijver Subject: [PATCH v6 06/10] clk: tegra: Workaround for Tegra114 MSENC problem Date: Mon, 11 Feb 2013 13:04:56 +0200 Message-ID: <1360580700-10245-7-git-send-email-pdeschrijver@nvidia.com> References: <1360580700-10245-1-git-send-email-pdeschrijver@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1360580700-10245-1-git-send-email-pdeschrijver-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org> Sender: linux-tegra-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: pdeschrijver-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-tegra@vger.kernel.org Workaround a hardware bug in MSENC during clock enable. Signed-off-by: Peter De Schrijver --- drivers/clk/tegra/clk-periph-gate.c | 9 +++++++++ drivers/clk/tegra/clk.h | 2 ++ 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/clk/tegra/clk-periph-gate.c b/drivers/clk/tegra/clk-periph-gate.c index 6dd5332..c9083fb 100644 --- a/drivers/clk/tegra/clk-periph-gate.c +++ b/drivers/clk/tegra/clk-periph-gate.c @@ -43,6 +43,8 @@ static DEFINE_SPINLOCK(periph_ref_lock); #define periph_clk_to_bit(periph) (1 << (gate->clk_num % 32)) +#define LVL2_CLK_GATE_OVRE 0x554 + /* Peripheral gate clock ops */ static int clk_periph_is_enabled(struct clk_hw *hw) { @@ -83,6 +85,13 @@ static int clk_periph_enable(struct clk_hw *hw) } } + if (gate->flags & TEGRA_PERIPH_WAR_1005168) { + writel_relaxed(0, gate->clk_base + LVL2_CLK_GATE_OVRE); + writel_relaxed(BIT(22), gate->clk_base + LVL2_CLK_GATE_OVRE); + udelay(1); + writel_relaxed(0, gate->clk_base + LVL2_CLK_GATE_OVRE); + } + spin_unlock_irqrestore(&periph_ref_lock, flags); return 0; diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index 4c4bf9a..fa21c88 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -356,6 +356,7 @@ struct tegra_clk_periph_regs { * TEGRA_PERIPH_ON_APB - If peripheral is in the APB bus then read the * bus to flush the write operation in apb bus. This flag indicates * that this peripheral is in apb bus. + * TEGRA_PERIPH_WAR_1005168 - Apply workaround for Tegra114 MSENC bug */ struct tegra_clk_periph_gate { u32 magic; @@ -375,6 +376,7 @@ struct tegra_clk_periph_gate { #define TEGRA_PERIPH_NO_RESET BIT(0) #define TEGRA_PERIPH_MANUAL_RESET BIT(1) #define TEGRA_PERIPH_ON_APB BIT(2) +#define TEGRA_PERIPH_WAR_1005168 BIT(3) void tegra_periph_reset(struct tegra_clk_periph_gate *gate, bool assert); extern const struct clk_ops tegra_clk_periph_gate_ops; -- 1.7.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: pdeschrijver@nvidia.com (Peter De Schrijver) Date: Mon, 11 Feb 2013 13:04:56 +0200 Subject: [PATCH v6 06/10] clk: tegra: Workaround for Tegra114 MSENC problem In-Reply-To: <1360580700-10245-1-git-send-email-pdeschrijver@nvidia.com> References: <1360580700-10245-1-git-send-email-pdeschrijver@nvidia.com> Message-ID: <1360580700-10245-7-git-send-email-pdeschrijver@nvidia.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Workaround a hardware bug in MSENC during clock enable. Signed-off-by: Peter De Schrijver --- drivers/clk/tegra/clk-periph-gate.c | 9 +++++++++ drivers/clk/tegra/clk.h | 2 ++ 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/clk/tegra/clk-periph-gate.c b/drivers/clk/tegra/clk-periph-gate.c index 6dd5332..c9083fb 100644 --- a/drivers/clk/tegra/clk-periph-gate.c +++ b/drivers/clk/tegra/clk-periph-gate.c @@ -43,6 +43,8 @@ static DEFINE_SPINLOCK(periph_ref_lock); #define periph_clk_to_bit(periph) (1 << (gate->clk_num % 32)) +#define LVL2_CLK_GATE_OVRE 0x554 + /* Peripheral gate clock ops */ static int clk_periph_is_enabled(struct clk_hw *hw) { @@ -83,6 +85,13 @@ static int clk_periph_enable(struct clk_hw *hw) } } + if (gate->flags & TEGRA_PERIPH_WAR_1005168) { + writel_relaxed(0, gate->clk_base + LVL2_CLK_GATE_OVRE); + writel_relaxed(BIT(22), gate->clk_base + LVL2_CLK_GATE_OVRE); + udelay(1); + writel_relaxed(0, gate->clk_base + LVL2_CLK_GATE_OVRE); + } + spin_unlock_irqrestore(&periph_ref_lock, flags); return 0; diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index 4c4bf9a..fa21c88 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -356,6 +356,7 @@ struct tegra_clk_periph_regs { * TEGRA_PERIPH_ON_APB - If peripheral is in the APB bus then read the * bus to flush the write operation in apb bus. This flag indicates * that this peripheral is in apb bus. + * TEGRA_PERIPH_WAR_1005168 - Apply workaround for Tegra114 MSENC bug */ struct tegra_clk_periph_gate { u32 magic; @@ -375,6 +376,7 @@ struct tegra_clk_periph_gate { #define TEGRA_PERIPH_NO_RESET BIT(0) #define TEGRA_PERIPH_MANUAL_RESET BIT(1) #define TEGRA_PERIPH_ON_APB BIT(2) +#define TEGRA_PERIPH_WAR_1005168 BIT(3) void tegra_periph_reset(struct tegra_clk_periph_gate *gate, bool assert); extern const struct clk_ops tegra_clk_periph_gate_ops; -- 1.7.1