The pixel clock is still enabled when the format is wrong. no error branch handle, and also some register is not set in this case, e.g: HDLCD_REG_<color>_SELECT. Maybe we should disable this clock and throw an warn message when this happened. With this change, the code maybe a bit more readable. Signed-off-by: Bernard Zhao <bernard@xxxxxxxx> Changes since V1: *add format error handle, if format is not correct, throw an warning message and disable this clock. Link for V1: *https://lore.kernel.org/patchwork/patch/1228501/ --- drivers/gpu/drm/arm/hdlcd_crtc.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/arm/hdlcd_crtc.c b/drivers/gpu/drm/arm/hdlcd_crtc.c index af67fefed38d..f3945dee2b7d 100644 --- a/drivers/gpu/drm/arm/hdlcd_crtc.c +++ b/drivers/gpu/drm/arm/hdlcd_crtc.c @@ -96,7 +96,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc) } if (WARN_ON(!format)) - return 0; + return -EINVAL; /* HDLCD uses 'bytes per pixel', zero means 1 byte */ btpp = (format->bits_per_pixel + 7) / 8; @@ -125,7 +125,7 @@ static int hdlcd_set_pxl_fmt(struct drm_crtc *crtc) return 0; } -static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc) +static int hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc) { struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc); struct drm_display_mode *m = &crtc->state->adjusted_mode; @@ -162,9 +162,10 @@ static void hdlcd_crtc_mode_set_nofb(struct drm_crtc *crtc) err = hdlcd_set_pxl_fmt(crtc); if (err) - return; + return err; clk_set_rate(hdlcd->clk, m->crtc_clock * 1000); + return 0; } static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc, @@ -173,7 +174,11 @@ static void hdlcd_crtc_atomic_enable(struct drm_crtc *crtc, struct hdlcd_drm_private *hdlcd = crtc_to_hdlcd_priv(crtc); clk_prepare_enable(hdlcd->clk); - hdlcd_crtc_mode_set_nofb(crtc); + if (hdlcd_crtc_mode_set_nofb(crtc)) { + DRM_DEBUG_KMS("Invalid format, pixel clock enable failed!\n"); + clk_disable_unprepare(hdlcd->clk); + return; + } hdlcd_write(hdlcd, HDLCD_REG_COMMAND, 1); drm_crtc_vblank_on(crtc); } -- 2.26.2 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
