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Commit bada5537 authored by Jingoo Han's avatar Jingoo Han Committed by Florian Tobias Schandinat
Browse files

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: default avatarJingoo Han <jg1.han@samsung.com>
Signed-off-by: default avatarFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
parent a654ddac

drivers/video/exynos/exynos_dp_reg.c

+9 −1
Original line number Diff line number Diff line
@@ -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);