1. 07 1月, 2012 1 次提交
    • G
      [media] xc3028: fix center frequency calculation for DTV78 firmware · 98ab8550
      Gianluca Gennari 提交于
      This patch replaces the previous one proposed in the thread "xc3028:
      force reload of DTV7 firmware in VHF band with Zarlink demodulator",
      at the linux-media@vger.kernel.org ML.
      
      The problem is that the firmware DTV78 works fine in UHF band (8 MHz
      bandwidth) but is not working at all in VHF band (7 MHz bandwidth).
      Reading the comments inside the code, I figured out that the real
      problem could be connected to the formula used to calculate the center
      frequency offset in VHF band.
      
      In fact, removing this adjustment fixes the problem:
      
      		if ((priv->cur_fw.type & DTV78) && freq < 470000000)
      			offset -= 500000;
      
      This is coherent to what was implemented for the DTV7 firmware by an
      Australian user:
      
      		if (priv->cur_fw.type & DTV7)
      			offset += 500000;
      
      In the end, now the center frequency is the same for all firmwares
      (DTV7, DTV8, DTV78) and doesn't depend on channel bandwidth.
      
      The final code looks clean and simple, and there is no need for any
      "magic" adjustment:
      
      		if (priv->cur_fw.type & DTV6)
      			offset = 1750000;
      		else	/* DTV7 or DTV8 or DTV78 */
      			offset = 2750000;
      Signed-off-by: NGianluca Gennari <gennarone@gmail.com>
      Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
      98ab8550
  2. 06 1月, 2012 39 次提交