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SubjectRe: [PATCH v5 08/36] drm/bridge: analogix_dp: Check AUX_EN status when doing AUX transfer
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On Saturday 10 March 2018 03:52 AM, Enric Balletbo i Serra wrote:
> From: Lin Huang <hl@rock-chips.com>
>
> We should check AUX_EN bit to confirm the AUX CH operation is completed.
>

Reviewed-by: Archit Taneja <architt@codeaurora.org>

Thanks,
Archit

> Cc: Stéphane Marchesin <marcheu@chromium.org>
> Signed-off-by: Lin Huang <hl@rock-chips.com>
> Signed-off-by: zain wang <wzz@rock-chips.com>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
> ---
>
> drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 25 +++++++++++++----------
> 1 file changed, 14 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 9df2f3ef000c..e78c861b9e06 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -1073,9 +1073,9 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
> {
> u32 reg;
> u8 *buffer = msg->buffer;
> - int timeout_loop = 0;
> unsigned int i;
> int num_transferred = 0;
> + int ret;
>
> /* Buffer size of AUX CH is 16 bytes */
> if (WARN_ON(msg->size > 16))
> @@ -1139,17 +1139,20 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>
> writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2);
>
> - /* Is AUX CH command reply received? */
> + ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2,
> + reg, !(reg & AUX_EN), 25, 500 * 1000);
> + if (ret) {
> + dev_err(dp->dev, "AUX CH enable timeout!\n");
> + return -ETIMEDOUT;
> + }
> +
> /* TODO: Wait for an interrupt instead of looping? */
> - reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
> - while (!(reg & RPLY_RECEIV)) {
> - timeout_loop++;
> - if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
> - dev_err(dp->dev, "AUX CH command reply failed!\n");
> - return -ETIMEDOUT;
> - }
> - reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
> - usleep_range(10, 11);
> + /* Is AUX CH command reply received? */
> + ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_INT_STA,
> + reg, reg & RPLY_RECEIV, 10, 20 * 1000);
> + if (ret) {
> + dev_err(dp->dev, "AUX CH cmd reply timeout!\n");
> + return -ETIMEDOUT;
> }
>
> /* Clear interrupt source for AUX CH command reply */
>

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