From f09e5b5d776debc2761e8d9330d60b8dcd8cb9dd Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Fri, 31 Aug 2018 19:12:59 +0100 Subject: [PATCH] drm: rcar-du: Update framebuffer pitch and alignment limits for Gen3 The framebuffer pitch and alignment constraints reflect the limitations of the Gen2 DU hardware. On Gen3, the DU has no memory interface and thus doesn't impose any constraint. The limitations come instead from the VSP that has a limit of 65535 bytes for the pitch and no alignment constraint. Update the checks accordingly. Signed-off-by: Laurent Pinchart Signed-off-by: Kieran Bingham --- drivers/gpu/drm/rcar-du/rcar_du_kms.c | 35 +++++++++++++++++++++++------------ 1 file changed, 23 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c index a58a969..b5d79ec 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c @@ -204,7 +204,6 @@ rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv, const struct rcar_du_format_info *format; unsigned int max_pitch; unsigned int align; - unsigned int bpp; unsigned int i; format = rcar_du_format_info(mode_cmd->pixel_format); @@ -214,20 +213,32 @@ rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv, return ERR_PTR(-EINVAL); } - /* - * The pitch and alignment constraints are expressed in pixels on the - * hardware side and in bytes in the DRM API. - */ - bpp = format->planes == 1 ? format->bpp / 8 : 1; - max_pitch = 4096 * bpp; + if (rcdu->info->gen < 3) { + /* + * On Gen2 the DU limits the pitch to 4095 pixels and requires + * buffers to be aligned to a 16 pixels boundary (or 128 bytes + * on some platforms). + */ + unsigned int bpp = format->planes == 1 ? format->bpp / 8 : 1; - if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B)) - align = 128; - else - align = 16 * bpp; + max_pitch = 4095 * bpp; + + if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B)) + align = 128; + else + align = 16 * bpp; + } else { + /* + * On Gen3 the memory interface is handled by the VSP that + * limits the pitch to 65535 bytes and has no alignment + * constraint. + */ + max_pitch = 65535; + align = 1; + } if (mode_cmd->pitches[0] & (align - 1) || - mode_cmd->pitches[0] >= max_pitch) { + mode_cmd->pitches[0] > max_pitch) { dev_dbg(dev->dev, "invalid pitch value %u\n", mode_cmd->pitches[0]); return ERR_PTR(-EINVAL); -- 2.7.4