On 19 February 2015 at 17:38, Antti Palosaari <crope@xxxxxx> wrote: > > > On 02/19/2015 12:21 PM, Antti Seppälä wrote: >> >> On 19 February 2015 at 11:43, Benjamin Larsson <benjamin@xxxxxxxxxxxx> >> wrote: >>> >>> On 2015-02-19 10:13, Antti Seppälä wrote: >>>> >>>> >>>> It seems that currently the firmware download on the mn88472 is >>>> somehow wrong for my Astrometa HD-901T2. >>>> >>>> Reducing the download chunk size (mn88472_config.i2c_wr_max) to 2 >>>> makes the firmware download consistently succeed. >>>> >>> >>> >>> Hi, try adding the workaround patch I sent for this. >>> >>> [PATCH 1/3] rtl28xxu: lower the rc poll time to mitigate i2c transfer >>> errors >>> >>> I now see that it hasn't been merged. But I have been running with this >>> patch for a few months now without any major issues. >>> >> >> The patch really did improve firmware loading. Weird... >> >> Even with it I still get occasional i2c errors from r820t: >> >> [ 15.874402] r820t 8-003a: r820t_write: i2c wr failed=-32 reg=0a len=1: >> da >> [ 81.455517] r820t 8-003a: r820t_read: i2c rd failed=-32 reg=00 >> len=4: 69 74 e6 df >> [ 99.949702] r820t 8-003a: r820t_read: i2c rd failed=-32 reg=00 >> len=4: 69 74 e6 df >> >> These errors seem to appear more often if I'm reading the signal >> strength values using e.g. femon. > > > Could you disable whole IR polling and test > modprobe dvb_usb_v2 disable_rc_polling=1 > > It is funny that *increasing* RC polling makes things better, though... > Hi. I tried loading the driver with polling disabled and it fails completely: [ 5526.693563] mn88472 7-0018: downloading firmware from file 'dvb-demod-mn88472-02.fw' [ 5527.032209] mn88472 7-0018: firmware download failed=-32 [ 5527.033864] rtl2832 7-0010: i2c reg write failed -32 [ 5527.033874] r820t 8-003a: r820t_write: i2c wr failed=-32 reg=05 len=1: 83 [ 5527.036014] rtl2832 7-0010: i2c reg write failed -32 I have no idea why the device behaves so counter-intuitively. Is there maybe some sorf of internal power-save mode the device enters when there is no i2c traffic for a while or something? -Antti -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
