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[79.30.36.203]) by smtp.gmail.com with ESMTPSA id a16sm754528qko.92.2020.05.13.13.36.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2020 13:36:30 -0700 (PDT) From: Angelo Dureghello To: adrian.hunter@intel.com, ulf.hansson@linaro.org, gerg@linux-m68k.org Cc: linux-mmc@vger.kernel.org, linux-m68k@vger.kernel.org, Angelo Dureghello Subject: [PATCH v4 2/3] mmc: sdhci: add quirks for be to le byte swapping Date: Wed, 13 May 2020 22:41:32 +0200 Message-Id: <20200513204133.2540568-2-angelo.dureghello@timesys.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200513204133.2540568-1-angelo.dureghello@timesys.com> References: <20200513204133.2540568-1-angelo.dureghello@timesys.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-m68k-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-m68k@vger.kernel.org Some controller as the ColdFire eshdc may require an endianness byte swap, becouse DMA read endianness is not configurable. Signed-off-by: Angelo Dureghello --- Changes for v3: - add post request callback Changes for v4: none --- drivers/mmc/host/sdhci.c | 7 +++++++ drivers/mmc/host/sdhci.h | 2 ++ 2 files changed, 9 insertions(+) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 3f716466fcfd..d3bfbb6e11d5 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -637,6 +637,13 @@ static int sdhci_pre_dma_transfer(struct sdhci_host *host, sg_copy_to_buffer(data->sg, data->sg_len, host->bounce_buffer, length); + + /* + * Endianness can't be swapped in the sg list, + * since the sg list is processed again later on. + */ + if (host->ops->pre_dma_transfer) + host->ops->pre_dma_transfer(host, data); } /* Switch ownership to the DMA */ dma_sync_single_for_device(host->mmc->parent, diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 79dffbb731d3..076054308423 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -653,6 +653,8 @@ struct sdhci_ops { void (*voltage_switch)(struct sdhci_host *host); void (*adma_write_desc)(struct sdhci_host *host, void **desc, dma_addr_t addr, int len, unsigned int cmd); + void (*pre_dma_transfer)(struct sdhci_host *host, + struct mmc_data *data); void (*request_done)(struct sdhci_host *host, struct mmc_request *mrq); }; -- 2.26.2