diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux-4.19/linux-yocto-4.19.8/1196-drm-amd-display-Use-udelay-when-waiting-between-aux-.patch')
-rw-r--r-- | meta-amd-bsp/recipes-kernel/linux-4.19/linux-yocto-4.19.8/1196-drm-amd-display-Use-udelay-when-waiting-between-aux-.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux-4.19/linux-yocto-4.19.8/1196-drm-amd-display-Use-udelay-when-waiting-between-aux-.patch b/meta-amd-bsp/recipes-kernel/linux-4.19/linux-yocto-4.19.8/1196-drm-amd-display-Use-udelay-when-waiting-between-aux-.patch new file mode 100644 index 00000000..251f7a74 --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux-4.19/linux-yocto-4.19.8/1196-drm-amd-display-Use-udelay-when-waiting-between-aux-.patch @@ -0,0 +1,39 @@ +From 74c19b3e67b5160f55bccf69148e231183a2bf07 Mon Sep 17 00:00:00 2001 +From: John Barberiz <John.Barberiz@amd.com> +Date: Wed, 16 Jan 2019 17:21:31 -0500 +Subject: [PATCH 1196/2940] drm/amd/display: Use udelay when waiting between + aux retries + +[Why] +"IRQ_HPD Pulse Length Test" DP compliance test +fails. Test complains that certain DPCD registers +are not read within 100 ms. + +[How] +msleep is inaccurate for small values. Used udelay +instead for accuracy. + +Change-Id: I4990fc56c7632fba373f2dbf64ac803d64619529 +Signed-off-by: John Barberiz <John.Barberiz@amd.com> +Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com> +Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> +--- + drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c +index adbb22224e1a..4febf4ef7240 100644 +--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c ++++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c +@@ -516,7 +516,7 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc, + } + } + +- msleep(1); ++ udelay(1000); + } + return false; + } +-- +2.17.1 + |