diff options
| author | Jingoo Han <jg1.han@samsung.com> | 2012-04-04 15:59:24 +0900 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2012-04-16 04:18:27 +0000 |
| commit | b5cfeed6cf90a4bb619b7ac640ba1a6dd002364d (patch) | |
| tree | aaa7b327f254febb8b711cef9bcc529e62feccad /drivers/video/exynos | |
| parent | 4e0dd49d2c4bc10d56bc536113c16f165c0edeb3 (diff) | |
video: exynos_dp: check DP PLL Lock status
DP PLL Lock status should be checked in order to prevent unlocked PLL.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Diffstat (limited to 'drivers/video/exynos')
| -rw-r--r-- | drivers/video/exynos/exynos_dp_reg.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/video/exynos/exynos_dp_reg.c b/drivers/video/exynos/exynos_dp_reg.c index 6548afa0e3d..169d1810d30 100644 --- a/drivers/video/exynos/exynos_dp_reg.c +++ b/drivers/video/exynos/exynos_dp_reg.c @@ -271,6 +271,7 @@ void exynos_dp_set_analog_power_down(struct exynos_dp_device *dp, void exynos_dp_init_analog_func(struct exynos_dp_device *dp) { u32 reg; + int timeout_loop = 0; exynos_dp_set_analog_power_down(dp, POWER_ALL, 0); @@ -282,9 +283,19 @@ void exynos_dp_init_analog_func(struct exynos_dp_device *dp) writel(reg, dp->reg_base + EXYNOS_DP_DEBUG_CTL); /* Power up PLL */ - if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) + if (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { exynos_dp_set_pll_power_down(dp, 0); + while (exynos_dp_get_pll_lock_status(dp) == PLL_UNLOCKED) { + timeout_loop++; + if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { + dev_err(dp->dev, "failed to get pll lock status\n"); + return; + } + usleep_range(10, 20); + } + } + /* Enable Serdes FIFO function and Link symbol clock domain module */ reg = readl(dp->reg_base + EXYNOS_DP_FUNC_EN_2); reg &= ~(SERDES_FIFO_FUNC_EN_N | LS_CLK_DOMAIN_FUNC_EN_N |