From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolas Ferre Subject: [PATCH] atmel_lcdfb: fix pixclok divider calculation Date: Tue, 06 May 2008 19:36:08 +0200 Message-ID: <48209708.3020807@atmel.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-fbdev-devel@lists.sourceforge.net, adaplas@gmail.com Cc: Per Hedblom , Roel Kluin <12o3l@tiscali.nl>, Jan Weber , Andrew Victor , Haavard Skinnemoen , linux-kernel@vger.kernel.org Fix divider calculation and allow CLKVAL = 0 (divisor 2) It was not possible to get the clock value 0 (divisor 2) because the test "<=0" force the BYPASS bit to be activated instead. Signed-off-by: Nicolas Ferre --- Thanks a lot to Jan, Per, Roel and Haavard for sending me similar patches. drivers/video/atmel_lcdfb.c | 7 +++---- 1 files changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c --- a/drivers/video/atmel_lcdfb.c +++ b/drivers/video/atmel_lcdfb.c @@ -441,13 +441,12 @@ static int atmel_lcdfb_set_par(struct fb_info *info) value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock)); - value = (value / 2) - 1; - dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", value); - - if (value <= 0) { + if (value < 2) { dev_notice(info->device, "Bypassing pixel clock divider\n"); lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS); } else { + value = (value / 2) - 1; + dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", value); lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET); info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1))); dev_dbg(info->device, " updated pixclk: %lu KHz\n",