diff options
| author | Jingoo Han <jg1.han@samsung.com> | 2012-08-08 01:10:59 (GMT) |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2012-08-23 13:17:11 (GMT) |
| commit | bada55371fb2b3615983ba231cad61ef21bdf9c3 (patch) | |
| tree | 94316007d099282afdec9797e9c84684a5fc24ff | |
| parent | a654ddac0892eb8495d75cbd7f45646895cc5e5f (diff) | |
| download | linux-bada55371fb2b3615983ba231cad61ef21bdf9c3.tar.xz | |
video: exynos_dp: check time loop for RPLY_RECEIV
This patch checks time loop for RPLY_RECEIV which means that
AUX channel command reply is received.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
| -rw-r--r-- | drivers/video/exynos/exynos_dp_reg.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/video/exynos/exynos_dp_reg.c b/drivers/video/exynos/exynos_dp_reg.c index 2db5b9a..174c445 100644 --- a/drivers/video/exynos/exynos_dp_reg.c +++ b/drivers/video/exynos/exynos_dp_reg.c @@ -401,6 +401,7 @@ int exynos_dp_start_aux_transaction(struct exynos_dp_device *dp) { int reg; int retval = 0; + int timeout_loop = 0; /* Enable AUX CH operation */ reg = readl(dp->reg_base + EXYNOS_DP_AUX_CH_CTL_2); @@ -409,8 +410,15 @@ int exynos_dp_start_aux_transaction(struct exynos_dp_device *dp) /* Is AUX CH command reply received? */ reg = readl(dp->reg_base + EXYNOS_DP_INT_STA); - while (!(reg & RPLY_RECEIV)) + while (!(reg & RPLY_RECEIV)) { + timeout_loop++; + if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) { + dev_err(dp->dev, "AUX CH command reply failed!\n"); + return -ETIMEDOUT; + } reg = readl(dp->reg_base + EXYNOS_DP_INT_STA); + usleep_range(10, 11); + } /* Clear interrupt source for AUX CH command reply */ writel(RPLY_RECEIV, dp->reg_base + EXYNOS_DP_INT_STA); |