> -----Original Message----- > From: york sun > Sent: Tuesday, July 26, 2016 1:38 AM > To: Yangbo Lu; u-boot@lists.denx.de > Subject: Re: [PATCH 4/4] mmc: add workaround for eSDHC erratum A009620 > > On 05/20/2016 03:20 AM, Yangbo Lu wrote: > > Erratum Title: > > Data timeout error not getting set in case of command with busy > > response (R1b) as well as for busy period after last write block > > transfer. > > > > Description: > > In the event that a busy timeout occurs for a command with a busy > > response (e.g. R1b response) as well as busy period after the last > > write block, the eSDHC does not set the IRQSTAT[DTOE] bit or the > > IRQSTAT[TC]. Therefore, the current command transfer is never completed. > > > > Workaround: > > Workaround for CMD with busy: > > Don't set the XFRTYP[RSP]=2'b11 for commands with busy response and > > poll the busy status of the card from the PRSSTAT[DLSL] > > > > Workaround for busy period after last write block: > > 1. After the command completion interrupt (IRQSTAT[CC]), wait for > > de-assertion of PRSTAT[WTA]. > > 2. Once PRSTAT[WTA] is de-asserted, start the software timer and poll > > the busy signal (DAT0) using PRSTAT[DLSL[0]]. > > 3. Wait for DAT0 signal to go high (which indicate transfer complete) > > or software timer expiry (which indicate data timeout error). > > 4. Issue soft reset for data (SYSCTL[RSTD]). > > 5. In case of data timeout error (detected in step 3) perform the > > error recovery. > > > > The workaround for CMD with busy has already been applied in eSDHC > > driver. This patch is to add workaround for the 2nd issue, and the > > fixup platforms include PowerPC(P1010/P2020/P5020/P5040/T1024/T1040/ > > T2080/T4240) and ARM(LS1021A/LS1043A/LS2080A). > > > > Signed-off-by: Yangbo Lu <yangbo...@nxp.com> > > --- > > arch/powerpc/include/asm/config_mpc85xx.h | 8 ++++++++ > > drivers/mmc/fsl_esdhc.c | 26 > ++++++++++++++++++++++++++ > > include/configs/ls1021aqds.h | 1 + > > include/configs/ls1021atwr.h | 1 + > > include/configs/ls1043a_common.h | 1 + > > include/configs/ls2080a_simu.h | 1 + > > include/configs/ls2080aqds.h | 1 + > > include/configs/ls2080ardb.h | 1 + > > include/fsl_esdhc.h | 1 + > > 9 files changed, 41 insertions(+) > > Yangbo, > > Why do you put the macro CONFIG_SYS_FSL_ERRATUM_ESDHC_A009620 in board > header file if the erratum applies to the SoC? > > York > [Lu Yangbo-B47093] Thanks a lot, York. Could you suggest any better place where I can put this macro? I didn't find such a good place :(
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