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SubjectRe: [PATCH v5 25/36] drm/bridge: analogix_dp: Properly log AUX CH errors
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On Saturday 10 March 2018 03:53 AM, Enric Balletbo i Serra wrote:
> From: Douglas Anderson <dianders@chromium.org>
>
> The code in analogix_dp_transfer() that was supposed to print out:
> AUX CH error happened
>
> Was actually dead code. That's because the previous check (whether
> the interrupt status indicated any errors) would have hit for all
> errors anyway.
>
> Let's combine the two error checks so we can actually see AUX CH
> errors. We'll also downgrade the message to a warning since some of
> these types of errors might be expected for some displays. If this
> gets too noisy we can downgrade again to debug.

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

Thanks,
Archit

>
> Cc: 征增 王 <wzz@rock-chips.com>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
> Reviewed-by: Andrzej Hajda <a.hajda@samsung.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 | 13 +++++--------
> 1 file changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 4eae206ec31b..58e8a28e99aa 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -1105,6 +1105,7 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
> struct drm_dp_aux_msg *msg)
> {
> u32 reg;
> + u32 status_reg;
> u8 *buffer = msg->buffer;
> unsigned int i;
> int num_transferred = 0;
> @@ -1193,16 +1194,12 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
>
> /* Clear interrupt source for AUX CH access error */
> reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
> - if (reg & AUX_ERR) {
> + status_reg = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA);
> + if ((reg & AUX_ERR) || (status_reg & AUX_STATUS_MASK)) {
> writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA);
> - goto aux_error;
> - }
>
> - /* Check AUX CH error access status */
> - reg = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA);
> - if ((reg & AUX_STATUS_MASK)) {
> - dev_err(dp->dev, "AUX CH error happened: %d\n\n",
> - reg & AUX_STATUS_MASK);
> + dev_warn(dp->dev, "AUX CH error happened: %#x (%d)\n",
> + status_reg & AUX_STATUS_MASK, !!(reg & AUX_ERR));
> goto aux_error;
> }
>
>

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