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>
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@ -401,6 +401,7 @@ int exynos_dp_start_aux_transaction(struct exynos_dp_device *dp)
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{
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int reg;
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int retval = 0;
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int timeout_loop = 0;
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/* Enable AUX CH operation */
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reg = readl(dp->reg_base + EXYNOS_DP_AUX_CH_CTL_2);
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@ -409,8 +410,15 @@ int exynos_dp_start_aux_transaction(struct exynos_dp_device *dp)
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/* Is AUX CH command reply received? */
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reg = readl(dp->reg_base + EXYNOS_DP_INT_STA);
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while (!(reg & RPLY_RECEIV))
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while (!(reg & RPLY_RECEIV)) {
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timeout_loop++;
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if (DP_TIMEOUT_LOOP_COUNT < timeout_loop) {
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dev_err(dp->dev, "AUX CH command reply failed!\n");
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return -ETIMEDOUT;
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}
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reg = readl(dp->reg_base + EXYNOS_DP_INT_STA);
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usleep_range(10, 11);
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}
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/* Clear interrupt source for AUX CH command reply */
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writel(RPLY_RECEIV, dp->reg_base + EXYNOS_DP_INT_STA);
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