X-Git-Url: https://git.proxmox.com/?p=pve-kernel.git;a=blobdiff_plain;f=patches%2Fkernel%2F0018-drm-mgag200-Fix-PLL-setup-for-G200_SE_A-rev-4.patch;fp=patches%2Fkernel%2F0018-drm-mgag200-Fix-PLL-setup-for-G200_SE_A-rev-4.patch;h=2dfcacb8cf2db021006510dfc28ea872d9fd9bc0;hp=0000000000000000000000000000000000000000;hb=4d1db3083ca7a6afa2ae4597aa93fdc35b066f2d;hpb=a0a93ff7fec0cd9cc2c17418a34084444d57b0d7 diff --git a/patches/kernel/0018-drm-mgag200-Fix-PLL-setup-for-G200_SE_A-rev-4.patch b/patches/kernel/0018-drm-mgag200-Fix-PLL-setup-for-G200_SE_A-rev-4.patch new file mode 100644 index 0000000..2dfcacb --- /dev/null +++ b/patches/kernel/0018-drm-mgag200-Fix-PLL-setup-for-G200_SE_A-rev-4.patch @@ -0,0 +1,47 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Jocelyn Falempe +Date: Thu, 13 Oct 2022 15:28:10 +0200 +Subject: [PATCH] drm/mgag200: Fix PLL setup for G200_SE_A rev >=4 + +commit b389286d0234e1edbaf62ed8bc0892a568c33662 upstream. + +For G200_SE_A, PLL M setting is wrong, which leads to blank screen, +or "signal out of range" on VGA display. +previous code had "m |= 0x80" which was changed to +m |= ((pixpllcn & BIT(8)) >> 1); + +Tested on G200_SE_A rev 42 + +This line of code was moved to another file with +commit 877507bb954e ("drm/mgag200: Provide per-device callbacks for +PIXPLLC") but can be easily backported before this commit. + +v2: * put BIT(7) First to respect MSB-to-LSB (Thomas) + * Add a comment to explain that this bit must be set (Thomas) + +Fixes: 2dd040946ecf ("drm/mgag200: Store values (not bits) in struct mgag200_pll_values") +Cc: stable@vger.kernel.org +Signed-off-by: Jocelyn Falempe +Reviewed-by: Thomas Zimmermann +Link: https://patchwork.freedesktop.org/patch/msgid/20221013132810.521945-1-jfalempe@redhat.com +Signed-off-by: Greg Kroah-Hartman +(cherry picked from commit 3650c063f22d03795026bd6f3d473e5bbdabb442) +Signed-off-by: Thomas Lamprecht +--- + drivers/gpu/drm/mgag200/mgag200_g200se.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +diff --git a/drivers/gpu/drm/mgag200/mgag200_g200se.c b/drivers/gpu/drm/mgag200/mgag200_g200se.c +index be389ed91cbd..bd6e573c9a1a 100644 +--- a/drivers/gpu/drm/mgag200/mgag200_g200se.c ++++ b/drivers/gpu/drm/mgag200/mgag200_g200se.c +@@ -284,7 +284,8 @@ static void mgag200_g200se_04_pixpllc_atomic_update(struct drm_crtc *crtc, + pixpllcp = pixpllc->p - 1; + pixpllcs = pixpllc->s; + +- xpixpllcm = pixpllcm | ((pixpllcn & BIT(8)) >> 1); ++ // For G200SE A, BIT(7) should be set unconditionally. ++ xpixpllcm = BIT(7) | pixpllcm; + xpixpllcn = pixpllcn; + xpixpllcp = (pixpllcs << 3) | pixpllcp; +