From a663f64bf18dea0816642ff343c5e3bf8fb22fca Mon Sep 17 00:00:00 2001 From: Veerabhadrarao Badiganti Date: Mon, 20 Jan 2020 20:08:38 +0530 Subject: [PATCH] mmc: sdhci: Let a vendor driver supply and update ADMA descriptor size Let a vendor driver supply the maximum descriptor size that it can operate on. ADMA descriptor table would be allocated using this supplied size. If any SD Host controller is of version prior to v4.10 spec but supports 16byte descriptor, this change allows them to supply correct descriptor size for ADMA table allocation. Also let a vendor driver update the descriptor size by overriding sdhc_host->desc_size if it has to operates on a different descriptor sizes in different conditions. Suggested-by: Adrian Hunter Signed-off-by: Veerabhadrarao Badiganti Acked-by: Adrian Hunter Link: https://lore.kernel.org/r/1579531122-28341-1-git-send-email-vbadigan@codeaurora.org Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.c | 16 +++++++--------- drivers/mmc/host/sdhci.h | 3 ++- 2 files changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index f9e0b5f..63db844 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -4043,15 +4043,13 @@ int sdhci_setup_host(struct sdhci_host *host) dma_addr_t dma; void *buf; - if (host->flags & SDHCI_USE_64_BIT_DMA) { - host->adma_table_sz = host->adma_table_cnt * - SDHCI_ADMA2_64_DESC_SZ(host); - host->desc_sz = SDHCI_ADMA2_64_DESC_SZ(host); - } else { - host->adma_table_sz = host->adma_table_cnt * - SDHCI_ADMA2_32_DESC_SZ; - host->desc_sz = SDHCI_ADMA2_32_DESC_SZ; - } + if (!(host->flags & SDHCI_USE_64_BIT_DMA)) + host->alloc_desc_sz = SDHCI_ADMA2_32_DESC_SZ; + else if (!host->alloc_desc_sz) + host->alloc_desc_sz = SDHCI_ADMA2_64_DESC_SZ(host); + + host->desc_sz = host->alloc_desc_sz; + host->adma_table_sz = host->adma_table_cnt * host->desc_sz; host->align_buffer_sz = SDHCI_MAX_SEGS * SDHCI_ADMA2_ALIGN; /* diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 1fe230c..a6a3ddc 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -558,7 +558,8 @@ struct sdhci_host { dma_addr_t adma_addr; /* Mapped ADMA descr. table */ dma_addr_t align_addr; /* Mapped bounce buffer */ - unsigned int desc_sz; /* ADMA descriptor size */ + unsigned int desc_sz; /* ADMA current descriptor size */ + unsigned int alloc_desc_sz; /* ADMA descr. max size host supports */ struct workqueue_struct *complete_wq; /* Request completion wq */ struct work_struct complete_work; /* Request completion work */ -- 2.7.4